Hello Hans,
thx for your reply, i thought of something similar. I` ll do some more
research on that.
What i also know concerning your answer (if you are interested):
keep writing the bits is not necessary. If i use a flag to write only
once but keep on looping in the run function, the leds stay on too. But
the loop is necessary.
So i guess it is somehow important to call the functions from line
573-585 and 617-623 in a loop.
regards
Malte
On 04.03.2011 09:18, Hans-Wilhelm Mehrkens wrote:
hello
as far as i know all beckhoff bus coupler (including the ethercat
ones) have a timeout timer built in, that means writing only once is
not sufficient to hold the outputs on.
It needs to write continiously to the device to avoid a timeout.
regards hans
Malte Lutz schrieb:
<div class="moz-text-flowed" style="font-family: -moz-fixed">Hello,
i' ve taken the RTAI-Example Module from the ethercat manual and
modified it to be able to write bits to the Beckhoff EL2004 Slave
(Digital Outputs) among other things.
to describe my problem i uploaded 2 different versions of my code:
1. http://pastebin.com/ERFhuhy7
2. http://pastebin.com/EiJeRJ1A
My problem lays in the function "run" (line 565-631):
In the code-version 2 i have an infinite loop, which writes 4 bits to
my EL2004 (1111). This works properly (LEDs are on)!
In the code-version 1 i commented out the loop to write the 4 bits
only once to the EL2004 and not infinite times, but that doesnt work
(LEDs stay off). Can someone explain me why this is happening?
thx
Malte
</div>
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