jcraft
Member
This is probably a basic question but need some info. We have several pairs of light curtains that the OSSD outputs go into the safety PLC and then the PLC sends the reset command to the L/C's. The curtians are reste hundreds of times a day and very intermittently we are getting a #1 output error on some of the curtains. The L/C manufacturer advised that the L/C needs to see a voltage level no higher than 1.3 volts above ground when the outputs are off or we could see the output error. They believe there is an issue with the grounding for the L/C's and advised to check and measure the quality of the ground. The curtains and the safety plc are fed from a separate 24vdc power supply by themselves. Not sure at this point how to measure the voltage on the ground wire. Can you advise the best way to go about this. Thx