So the equal box is just comparing the source A and B values and if the imported value (B) matches the source value (A) the rung becomes true? What are these boxes called?
Chris, that's 100% correct. The EQU instruction is just there to indicate TRUE if both values are identical. They're called Ladder Logic Instructions. In this case, it's a conditional instruction since it resides on the left side of the ladder and is a condition for the rung to execute.
@@SolisPLC Perfect thank you for all the help man. I'm am an electrician in the auto industry so I will be using the plc for minor program changes, testing and troubleshooting.
DO they have to both same tag location? EX..controller tag to controller tag?(same controller) or can they be any program tag to main program..etc. because i a cannot move any DINTs (both program tags) . i am trying to move a zero to a dint and it will not change
No, most instructions don't have this limitation. Only certain CONTROL based tags need to be specified as controller only. I can only think of the PID and MSG instructions right now, but there are several others.
It depends on what you want to do with the value. You can for example use an HMI to read this register and display the value on the screen. You can compare this value to another on the PLC using something like the GRT. Example: When Temperature Actual (GRT) Temperature Setpoint DO something.
