32Racer Posted March 13, 2013 Report Share Posted March 13, 2013 Looking for a little help on a Vision 570-57-T20B and a snap V200 18E62B.. I have this setup running a packaging machine. I did not do the programming of the unit. I am also not a programmer. Here is the problem that I am having and hope someone can give me a little assistance. I am using the PWM output to control a Solid State Relay. I am sending pulses to the relay to control heat on a resistance Wire to seal poly bags. The PLC has no input to turn the PWM output on. It comes on when the machine is powered up. The program was written and machine installed and has been running since October 2012. Now it seems that the PLC is not sending any pulses out from one of the PWM outputs. The other one is working correctly. I have confirmed that the wiring from the Plc to the SSR is correct. So it is like the PWM output isn't sending any pulses. Another strange thing, After the program was written and machine was tested I bought another exact same model Unitronics PLC and downloaded the exact same program into it. This was a different packaging machine but when I turned on the PLC everything in the program except the 2 PWM outputs worked. I went in Visilogic and can turn on the outputs manually and the relay will activate. But when I run the program I get no PWM outputs. This is the same program that has worked since October in the other machine. Can someone please tell me how to look in the program and see the pulses or any other test I can do?? Could it be possible I need relay outputs to control the SSR? Any help will be greatly appreciated. Quote Link to comment Share on other sites More sharing options...
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