Rookie Posted January 4, 2020 Report Share Posted January 4, 2020 Hello, I am struggling to understand Visilogic's MODBUS tools. Say I would like to turn a light on and off from the master PLC, while the output is attached to the slave PLC. What would be the best function block to do this? I keep using the FB #5 and I will get the bits set high, but then they will stay high. I am practicing so I can use PTO utilities to control steppers instead of lights. First, I need assistance in understanding why things like MODBUS FB (5) sets and doesn't reset. The attachments are just HMI lights telling you if you get the commands from the Master PLC. (You get them only if the 2 bits begin in RESET using the online mode) Otherwise, O5 in the picture is the LED I am trying to turn off and on from the master. Thank you! MASTER MODBUS TEST.vlp SLAVE MODBUS TEST.vlp Quote Link to comment Share on other sites More sharing options...
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