Re: [Emc-users] Ladder logic documentation [Was: Simple, adjustable timer]
. -- Greetings Bertho (disclaimers are disclaimed) -- Message: 3 Date: Mon, 23 Mar 2015 21:59:04 -0600 From: Gregg Eshelman g_ala...@yahoo.com Subject: Re: [Emc-users] Ladder logic documentation [Was: Simple, adjustable timer] To: emc-users@lists.sourceforge.net Message-ID: 5510e108.2010...@yahoo.com Content-Type: text/plain; charset=utf-8; format=flowed On 3/23/2015 7:37 AM, Erik Christiansen wrote: On 23.03.15 08:33, Mark Wendt wrote: So, following that logic, off is on, and on is off. ;-) Taking such facetiousness at face value, I think the real situation is: OFF is on and off, and ON is on and off where OFF/ON is input, and on/off is output, with no and nc contacts simply being the complement of each other. Sounds like a meditation mantra from an old SciFi book, I have it somewhere, can't recall the author or title right now... note the capitalization... Is Not is not Not Is. Not Is is not Is Not. If Is is Is Not and Is Not is Is then Is is Not Is... IIRC it had something to do with reality VS one's perception of reality and getting rid of misperceptions that limit one's potential. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- Message: 4 Date: Mon, 23 Mar 2015 22:31:47 -0600 From: Gregg Eshelman g_ala...@yahoo.com Subject: [Emc-users] Anyone remember the Purdue CAD-LAB? To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Message-ID: 5510e8b3.4010...@yahoo.com Content-Type: text/plain; charset=utf-8; format=flowed Circa 1999 Purdue University's CAD-LAB developed some CAD/CAM software for Windows, Macintosh and Linux I'd like to obtain copies of. The main reason I'd like to get that is because some of it was written specifically for a proLIGHT PLM2000. The tutorial showing how to use the software is very interesting - but without the software it only makes me look grimly at the old DOS program and wish for LCNC support for the PLM2000. (Or support from *any* somewhat modern machine control software.) Being open source, recovering it should be of some benefit at large for CAD/CAM development. archive.org saved the website and some of the documentation but not the software due to their FTP server having a robots'txt file at the root level. Since then the university has completely altered their public FTP (what little there is of it) and nothing from then is there. The functions of the CAD-LAB have been spread around the engineering department. It doesn't matter if a robots.txt expressly permits spiders, crawlers and archivers (which Purdue's did), archive.org will not save anything from any site or server at or below the level where a robots.txt file is. As for getting G-code that works on the PLM2000, I've successfully used Heeks with the LCNC post process option, have to comment out the G43 it insists upon inserting and I have to edit the feed rate, which for some reason it always sets at 4 IPM no matter what I select in the GUI. Eh, it's a work in progress and only cost $15 for the no-nag version. At least I can cut metal in fancy shapes! :) The major difference between the Animatics and Fanuc controllers Light Machines used is Animatics defaults to incremental arc centers (put a $ in the NC file to switch to absolute) while the later Fanuc model defaults to absolute arc centers (add a % to the NC file to switch to incremental). --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- Message: 5 Date: Tue, 24 Mar 2015 14:19:16 + From: andy pugh bodge...@gmail.com Subject: Re: [Emc-users] Anyone remember the Purdue CAD-LAB? To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Message-ID: can1+yzxmed3yaoetjvrjb+gpxtcgckcbndyawpcg_uus_pm...@mail.gmail.com Content-Type: text/plain; charset=UTF-8 On 24 March 2015 at 04:31, Gregg Eshelman g_ala...@yahoo.com wrote: it only makes me look grimly at the old DOS program and wish for LCNC support for the PLM2000 Have you made any progress on sniffing the communication protocol? -- atp If you can't fix it, you don't own it. http://www.ifixit.com/Manifesto -- Message: 6 Date: Tue, 24 Mar 2015 18:04:59 -0600 From: Gregg Eshelman g_ala...@yahoo.com Subject: Re: [Emc-users] Anyone remember the Purdue CAD-LAB? To: Enhanced Machine Controller (EMC) emc-users@lists.sourceforge.net Message-ID: 5511fbab.9000...@yahoo.com Content-Type: text/plain; charset=utf-8; format=flowed On 3/24/2015 8:19 AM, andy pugh wrote: On 24 March 2015 at 04:31, Gregg Eshelman g_ala...@yahoo.com wrote: it only makes me look grimly at the old DOS program and wish for LCNC support for the PLM2000 Have you made any progress on sniffing the communication protocol? Don't know what I'd need to do that. Possibly
Re: [Emc-users] Ladder logic documentation [Was: Simple, adjustable timer]
I managed to get lost in this thread, what ladder component is in question here? I rely heavily on Classicladder in my machines, averaging over 200 rungs per machine, and am curious as to what may be possibly wrong. Thanks Rick On 3/23/2015 8:33 AM, Mark Wendt wrote: On Mon, Mar 23, 2015 at 8:09 AM, Erik Christiansen dva...@internode.on.net wrote: On 23.03.15 07:30, Mark Wendt wrote: On Mon, Mar 23, 2015 at 7:17 AM, Erik Christiansen wrote: Try it as I describe, and the diagram and text should align without any clashing of mental gears. The logic still doesn't match up with the simple switch diagram. And yet you show yourself that it does, and your subconscious understands the logic: B1 has to be activated for current to flow to the coil, to close the contact on Q0. Yep, that's the green button on a commercial or homebuilt NVR. It's momentary, NO. Press it for the NVR to latch on. (And activated == on, so NO - closed, both for switch and relay.) B0 has to be in it's normal state. Yep, that's the red button on a NVR, as on my lathe. It's momentary, NC. Press it to reset the NVR latch. (normal state == inactivated == off == NC is closed, NO is open ) If you activate B0, you cut off the current and the contacts on Q0 open. Yup, that's the mechanics of the relay logic implementation. (activated == on = NC-open, NO-closed, possibly both on the same switch or relay, and maybe six of each on the one relay, if there is output to many other ladder rungs.) See, the logic _is_ coherent. :-)) Erik So, following that logic, off is on, and on is off. ;-) Mark -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Thanks Rick Lair Superior Roll Turning LLC 399 East Center Street Petersburg MI, 49270 PH: 734-279-1831 FAX: 734-279-1166 www.superiorroll.com -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ladder logic documentation [Was: Simple, adjustable timer]
http://www.vdwalle.com/Norte/Classic%20Ladder%20Examples.html Section 1.1 Basic Ladder Basic Concepts On Mon, Mar 23, 2015 at 8:52 AM, Rick r...@superiorroll.com wrote: I managed to get lost in this thread, what ladder component is in question here? I rely heavily on Classicladder in my machines, averaging over 200 rungs per machine, and am curious as to what may be possibly wrong. Thanks Rick On 3/23/2015 8:33 AM, Mark Wendt wrote: On Mon, Mar 23, 2015 at 8:09 AM, Erik Christiansen dva...@internode.on.net wrote: On 23.03.15 07:30, Mark Wendt wrote: On Mon, Mar 23, 2015 at 7:17 AM, Erik Christiansen wrote: Try it as I describe, and the diagram and text should align without any clashing of mental gears. The logic still doesn't match up with the simple switch diagram. And yet you show yourself that it does, and your subconscious understands the logic: B1 has to be activated for current to flow to the coil, to close the contact on Q0. Yep, that's the green button on a commercial or homebuilt NVR. It's momentary, NO. Press it for the NVR to latch on. (And activated == on, so NO - closed, both for switch and relay.) B0 has to be in it's normal state. Yep, that's the red button on a NVR, as on my lathe. It's momentary, NC. Press it to reset the NVR latch. (normal state == inactivated == off == NC is closed, NO is open ) If you activate B0, you cut off the current and the contacts on Q0 open. Yup, that's the mechanics of the relay logic implementation. (activated == on = NC-open, NO-closed, possibly both on the same switch or relay, and maybe six of each on the one relay, if there is output to many other ladder rungs.) See, the logic _is_ coherent. :-)) Erik So, following that logic, off is on, and on is off. ;-) Mark -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Thanks Rick Lair Superior Roll Turning LLC 399 East Center Street Petersburg MI, 49270 PH: 734-279-1831 FAX: 734-279-1166 www.superiorroll.com -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ladder logic documentation [Was: Simple, adjustable timer]
On 23.03.15 08:33, Mark Wendt wrote: So, following that logic, off is on, and on is off. ;-) Taking such facetiousness at face value, I think the real situation is: OFF is on and off, and ON is on and off where OFF/ON is input, and on/off is output, with no and nc contacts simply being the complement of each other. Even ECL logic gates have both inverted and uninverted outputs. They also provide a logic 1 _and_ a logic 0 output for true input. The confusion seems to arise from the fact that relay logic, whether ladder logic or just a rat's nest, performs its boolean operations using many outputs (relay contacts), and just one input, if we take the physical relay as the component. Once we see the logic gate as a physically dispersed collecting of input contacts, and an output coil, then we're beginning to see the ladder wielder's view - each rung is a logic gate with an arbitrary number of inputs, normal (NO) or inverted (NC). The fan-out of a gate is the number of contacts, but it is possible to run out of normal fan-out before inverted, or vv. Fan-in is higher than anyone would normally ever need, especially with higher voltage coils. And finally, on what is on, and what is off: When an input switch or a relay is energised, then all its contacts transition from what they wuz to what they wuzn't. (So we could call it wuzzy logic, perhaps. ;-) Erik -- Harrisberger's Fourth Law of the Lab: Experience is directly proportional to the amount of equipment ruined. -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
[Emc-users] Ladder logic documentation [Was: Simple, adjustable timer]
On 23.03.15 05:49, Mark Wendt wrote: On Mon, Mar 23, 2015 at 5:41 AM, Erik Christiansen wrote: Though I am a logic kinda guy, not a ladder wielder, I interpret the off to refer to the B0 coil, not one of its contacts, which may be NC or NO. That makes a NC contact an inverted output which is a 1 when the input is 0. Does that realign the planets? I'm a comp sci kinda guy, so I'm familiar with logic too. ;-) According to the description, B0 and B1 are switches, not relays. Ah, true. Them's input switches, and the thing operates like a standard No-Volt Release. Q0 is the relay. And it also says in the description B0 is normally closed. So, with that in mind, is normally closed off, and open on? Now the meaning seems to me to be that the switch is on when it has been actuated, i.e. not in its default state. That will open a NC, and close a NO contact. Just like any relay further down in the ladder, NC and NO contacts are inverted and non-inverted outputs from a single input gate, and have opposite logic levels for the same condition of on for the relay/switch. (Boolean operations are implemented by parallel/serial contact combinations on these outputs, not on gate inputs, so a bit of A..-backwards nomenclature is needed to make it simple, I think.) I don't believe the description is remotely coherent if off/on were to be interpreted as 0/1 logic levels. Try it as I describe, and the diagram and text should align without any clashing of mental gears. Erik -- A computer is like an air conditioner, it works poorly when you open Windows. -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ladder logic documentation [Was: Simple, adjustable timer]
On 23.03.15 07:30, Mark Wendt wrote: On Mon, Mar 23, 2015 at 7:17 AM, Erik Christiansen wrote: Try it as I describe, and the diagram and text should align without any clashing of mental gears. The logic still doesn't match up with the simple switch diagram. And yet you show yourself that it does, and your subconscious understands the logic: B1 has to be activated for current to flow to the coil, to close the contact on Q0. Yep, that's the green button on a commercial or homebuilt NVR. It's momentary, NO. Press it for the NVR to latch on. (And activated == on, so NO - closed, both for switch and relay.) B0 has to be in it's normal state. Yep, that's the red button on a NVR, as on my lathe. It's momentary, NC. Press it to reset the NVR latch. (normal state == inactivated == off == NC is closed, NO is open ) If you activate B0, you cut off the current and the contacts on Q0 open. Yup, that's the mechanics of the relay logic implementation. (activated == on = NC-open, NO-closed, possibly both on the same switch or relay, and maybe six of each on the one relay, if there is output to many other ladder rungs.) See, the logic _is_ coherent. :-)) Erik -- Why make things difficult, when it is possible to make them cryptic and totally illogical, with just a little bit more effort? - A. P. J. -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ladder logic documentation [Was: Simple, adjustable timer]
On Mon, Mar 23, 2015 at 8:09 AM, Erik Christiansen dva...@internode.on.net wrote: On 23.03.15 07:30, Mark Wendt wrote: On Mon, Mar 23, 2015 at 7:17 AM, Erik Christiansen wrote: Try it as I describe, and the diagram and text should align without any clashing of mental gears. The logic still doesn't match up with the simple switch diagram. And yet you show yourself that it does, and your subconscious understands the logic: B1 has to be activated for current to flow to the coil, to close the contact on Q0. Yep, that's the green button on a commercial or homebuilt NVR. It's momentary, NO. Press it for the NVR to latch on. (And activated == on, so NO - closed, both for switch and relay.) B0 has to be in it's normal state. Yep, that's the red button on a NVR, as on my lathe. It's momentary, NC. Press it to reset the NVR latch. (normal state == inactivated == off == NC is closed, NO is open ) If you activate B0, you cut off the current and the contacts on Q0 open. Yup, that's the mechanics of the relay logic implementation. (activated == on = NC-open, NO-closed, possibly both on the same switch or relay, and maybe six of each on the one relay, if there is output to many other ladder rungs.) See, the logic _is_ coherent. :-)) Erik So, following that logic, off is on, and on is off. ;-) Mark -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ladder logic documentation [Was: Simple, adjustable timer]
It can actually be a lot more complicated than that now.The newer PLCs can have multiple outputs in one rung and they don't have to be driven by a singular logical result. They can also have embedded numerical comparisons, one shot / edge instructions, counters and timers. The logic can get very complex. Structures were also added some years ago to the newer controllers. Indirect addressing has been around for years. The newer controllers also have different language options. Structured Text is a popular Pascal like language. Symbolic programming is very popular now as well. The IEC 61131-3 standard describes 5 different standard languages. Dave On 3/23/2015 8:37 AM, Erik Christiansen wrote: On 23.03.15 08:33, Mark Wendt wrote: So, following that logic, off is on, and on is off. ;-) Taking such facetiousness at face value, I think the real situation is: OFF is on and off, and ON is on and off where OFF/ON is input, and on/off is output, with no and nc contacts simply being the complement of each other. Even ECL logic gates have both inverted and uninverted outputs. They also provide a logic 1 _and_ a logic 0 output for true input. The confusion seems to arise from the fact that relay logic, whether ladder logic or just a rat's nest, performs its boolean operations using many outputs (relay contacts), and just one input, if we take the physical relay as the component. Once we see the logic gate as a physically dispersed collecting of input contacts, and an output coil, then we're beginning to see the ladder wielder's view - each rung is a logic gate with an arbitrary number of inputs, normal (NO) or inverted (NC). The fan-out of a gate is the number of contacts, but it is possible to run out of normal fan-out before inverted, or vv. Fan-in is higher than anyone would normally ever need, especially with higher voltage coils. And finally, on what is on, and what is off: When an input switch or a relay is energised, then all its contacts transition from what they wuz to what they wuzn't. (So we could call it wuzzy logic, perhaps. ;-) Erik --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ladder logic documentation [Was: Simple, adjustable timer]
The example is properly described. The example shows a normally closed contact and then two parallel contacts next which are normally open. The output coil drives one of the parallel contacts so the logic line is basically a start/stop logic rung with a seal in contact. In the old PLC training books they used some terminology to help new users understand ladder logic. The normally open contact (NO contact) was said to be an examine for on instruction and the normally closed contact (NC contact) was said to be an examine for off instruction. The use of the term instruction made people realize that that ladder logic was really a programming language rather than actual contacts and relays which made ladder logic training a lot simpler. So reading the rung from left to right... the first instruction is an examine for off - so if bit B0 is off that instruction will be true. The next instructions to the right are logically ANDED with the first instruction.So examine B1 for on OR examine Q0 for on .. Then take the logical AND result and write it to the output coil Q0. Dave On 3/23/2015 7:52 AM, Rick wrote: I managed to get lost in this thread, what ladder component is in question here? I rely heavily on Classicladder in my machines, averaging over 200 rungs per machine, and am curious as to what may be possibly wrong. Thanks Rick On 3/23/2015 8:33 AM, Mark Wendt wrote: On Mon, Mar 23, 2015 at 8:09 AM, Erik Christiansen dva...@internode.on.net wrote: On 23.03.15 07:30, Mark Wendt wrote: On Mon, Mar 23, 2015 at 7:17 AM, Erik Christiansen wrote: Try it as I describe, and the diagram and text should align without any clashing of mental gears. The logic still doesn't match up with the simple switch diagram. And yet you show yourself that it does, and your subconscious understands the logic: B1 has to be activated for current to flow to the coil, to close the contact on Q0. Yep, that's the green button on a commercial or homebuilt NVR. It's momentary, NO. Press it for the NVR to latch on. (And activated == on, so NO - closed, both for switch and relay.) B0 has to be in it's normal state. Yep, that's the red button on a NVR, as on my lathe. It's momentary, NC. Press it to reset the NVR latch. (normal state == inactivated == off == NC is closed, NO is open ) If you activate B0, you cut off the current and the contacts on Q0 open. Yup, that's the mechanics of the relay logic implementation. (activated == on = NC-open, NO-closed, possibly both on the same switch or relay, and maybe six of each on the one relay, if there is output to many other ladder rungs.) See, the logic _is_ coherent. :-)) Erik So, following that logic, off is on, and on is off. ;-) Mark -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ladder logic documentation [Was: Simple, adjustable timer]
On Mon, Mar 23, 2015 at 7:17 AM, Erik Christiansen dva...@internode.on.net wrote: On 23.03.15 05:49, Mark Wendt wrote: On Mon, Mar 23, 2015 at 5:41 AM, Erik Christiansen wrote: Though I am a logic kinda guy, not a ladder wielder, I interpret the off to refer to the B0 coil, not one of its contacts, which may be NC or NO. That makes a NC contact an inverted output which is a 1 when the input is 0. Does that realign the planets? I'm a comp sci kinda guy, so I'm familiar with logic too. ;-) According to the description, B0 and B1 are switches, not relays. Ah, true. Them's input switches, and the thing operates like a standard No-Volt Release. Yep. B0 and B1 are two different switches. B0 is NC and B1 is is NO. Here's the sentence above the offending one: To turn the coil off one must momentarily open the 'normally closed' B0 contact which supplies 'power' to the whole line. According to this sentence, activating B0 turns power off on the line. Q0 is the relay. And it also says in the description B0 is normally closed. So, with that in mind, is normally closed off, and open on? Now the meaning seems to me to be that the switch is on when it has been actuated, i.e. not in its default state. That will open a NC, and close a NO contact. Just like any relay further down in the ladder, NC and NO contacts are inverted and non-inverted outputs from a single input gate, and have opposite logic levels for the same condition of on for the relay/switch. (Boolean operations are implemented by parallel/serial contact combinations on these outputs, not on gate inputs, so a bit of A..-backwards nomenclature is needed to make it simple, I think.) I don't believe the description is remotely coherent if off/on were to be interpreted as 0/1 logic levels. Try it as I describe, and the diagram and text should align without any clashing of mental gears. The logic still doesn't match up with the simple switch diagram. B1 has to be activated for current to flow to the coil, to close the contact on Q0. B0 has to be in it's normal state. If you activate B0, you cut off the current and the contacts on Q0 open. So we have to determine what state the author meant for B0 being off or on. Low or high, 0 or 1, NC or NO. ;-) -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
Re: [Emc-users] Ladder logic documentation [Was: Simple, adjustable timer]
On 3/23/2015 7:37 AM, Erik Christiansen wrote: On 23.03.15 08:33, Mark Wendt wrote: So, following that logic, off is on, and on is off. ;-) Taking such facetiousness at face value, I think the real situation is: OFF is on and off, and ON is on and off where OFF/ON is input, and on/off is output, with no and nc contacts simply being the complement of each other. Sounds like a meditation mantra from an old SciFi book, I have it somewhere, can't recall the author or title right now... note the capitalization... Is Not is not Not Is. Not Is is not Is Not. If Is is Is Not and Is Not is Is then Is is Not Is... IIRC it had something to do with reality VS one's perception of reality and getting rid of misperceptions that limit one's potential. --- This email has been checked for viruses by Avast antivirus software. http://www.avast.com -- Dive into the World of Parallel Programming The Go Parallel Website, sponsored by Intel and developed in partnership with Slashdot Media, is your hub for all things parallel software development, from weekly thought leadership blogs to news, videos, case studies, tutorials and more. Take a look and join the conversation now. http://goparallel.sourceforge.net/ ___ Emc-users mailing list Emc-users@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/emc-users
