Tag Archives: brx plc counters

BRX PLC Counters

A majority of the programmable logic controller (PLC) programs will include a counter instruction. The BRX series of programmable logic controllers have several different counters available for your program. There are five different basic counter instructions in the PLC. The memory area for counters (CT), include the Counter PVs (Present Values) Counter SVs (Set Values) and the Counter Completion Flags. The default size of the counter area is CT0 – CT255. This size can change to the amount that we need for our program. Please see BRX PLC Numbering Systems and Addressing on how to change the memory configuration of the controller.
We will be looking at the counter instructions in the BRX PLC along with some programming examples. As a system integrator, this ability can prove very useful to you in the field when commissioning your automation system. When dealing with counters, we need to look at timing charts. The Secret of Using Counters is a good refresher on using timing charts.
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BRX PLC Monitoring and Testing the Program

Our first program for the BRX PLC involved a start stop jog circuit. We will now use the Do-More Designer Software to monitor, test and modify this program. As a system integrator, this ability can prove very useful to you in the field when troubleshooting your automation system.
We will be monitoring the ladder logic status and bits. Changing the bit status will be done by forcing the inputs and outputs.
Here is a link explaining the logic behind our circuit.
How to Make a Start Stop Jog Circuit in a PLC
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