It also makes it very easy to connect multiple E-Stop and motion safety
switches by stringing them all together in series. Any one that's pushed or hit
opens the circuit and the machine stops. It's more complex to use normally open
stop/safety switches because every one has to be wired in
Hi John,
Well, in the mazak the only inductive sensors we had to hack that way were
the ones in the turret so it made no difference. All the limits were
mechanical switches so no problem with those. I see your point, and since I
plan to use these as limits and homing switches, I guess I'll go
Ask yourself this question.
If a wire connecting to the limit switch or ESTOP breaks or becomes
intermittent does the system safely stop?
One of the biggest reasons for using NC type switches (or PNP) is that a
failure in the power or wiring to them also causes a stop.
John
> -Original
Hi guys,
A quick question to see if there's anything wrong with this.
7i70 comes ready for PNP sensors. In the mazak all the sensors were NPN so
when we converted it to LCNC we had to add a resistor between the +24 volts
and the input of each sensor on the 7i70 to have the two states and avoid
