Two Jazz PLC's output wiring

[dseligo]

Is it allowed/safe to connect together transistor outputs from two Jazz PLC's (specifically JZ20-J-T18) or must they be separated with diodes? They would be connected to the same relay.

In other words, can damage be made to PLC if 24V is applied to output while it is inactive?

They are on the same power supply.

[kratmel]

 

2 hours ago, dseligo said:

Is it allowed/safe to connect together transistor outputs from two Jazz PLC's

No, for PNP output two diodes are required for matching and one diode in parallel to the relay coil to avoid self-induction.

 

[dseligo]

Thank you.