kfabernathy80
When I try to run a program on OpenPLC on an Arduino Uno, the tx and rx lights flash but the circuit doesn’t do what it’s supposed to do. The same circuit and program work on other PCs. Does anyone know how to fix this issue?  
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thiagoralves
If the leds are flashing there is a high chance that either you program, or your circuit, or both are wrong
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tommymorris

Case closed. Needed to use correct pin addresses in ladder logic variable declarations for OpenPLC v3 (%IX100.1, %QX100.0, etc) as opposed to the Raspberry PI addresses (%IX0.0,%QX0.0,etc).

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