S7-1200 Failsafe CPU + Twohand control

Hello all.

I have just recently got a S7-1200 F CPU and safety licence and I am trying different things. So far I've tried monitoring of emergency stop and safety doors. Today I have tried to implement a two hand control function, but I have some problems.

This is the wiring that I have done between the two hand station and the PLC(see the attached picture)

But it's not OK because the digital inputs are always ON, they don't turn off when the buttons are pressed. But I think that they shouldn't be on in the first place...

Should I try to connect 1 of the two and control station to VS1 and 3 to VS2?

Any ideas on how to solve this issue?
Cheers
Aleix

I think you should use the power 24 VDC supplied by the channel (Vs1/Vs2).


How have you configured your hardware?

Connect 24v to 2, truth table for 1,3,4 as inputs as follows:

I wired JSTD25F pin 1 of the M12 connector to X11-3 (Vs2), JSTD25F pin 4 of the M12 connector to X10-3 (Vs1), set the evaluation to 1oo2 and set the sensor supply to internal and then I got the following error:
The channels are shorted to P...

Shouldn't I use 1oo1 evaluation so that I will get two channels for the two hand control function block?

Thanks for any further input...

Cheers

I'm looking at that diagram, and it looks to me like the input
from '2' is NO on the left, and NC on the right. The input from
'3' is NO on the right, and NC on the left. So no matter how
one pushes the buttons, both inputs should be high.

Which makes no sense to me.

Maybe you need a 'JSBR4' to go with it?

https://library.e.abb.com/public/c5093e37d23745e4a50c605119100325/JSTD25_2TLC010015L0201.pdf

Poet.

What is a safety Licence?

Here's an example two hand control system from Siemens - to use their solution you need to have access to the contacts as shown in their documentation and not use the prewired system you have shown.


https://support.industry.siemens.co...ed-emergency-stop-in-ple-sil-3?dti=0&lc=en-WW

roxusa said:

What is a safety Licence?

Click to expand...

You need a separate distributed safety license to edit safety programs in Siemens TIA (or Simatic Manager).

Hello all.
I managed to get it working by rewiring the two hand station. The wiring was not OK like you said for the digital inputs.

Thanks, guys for the useful tips.
Cheers Aleix