Instead of trying to find where it’s being turn ON or OFF, you can force it to be whatever you need.Ī simple example could be a light which is controlled by multiple sources. This becomes extremely useful as you get into complex code which continuously enables or disables certain outputs. When enabled, a force will undeniably make sure that the tag is either ON or OFF (depending on the force). The primary reason why you’d want to use forces within your PLC is to troubleshoot certain problems. They may have the right intention and come back to fix the core issue, but based on personal experience, this rarely happens and the force remains in place. In fact, a lot of incompetent individuals will use a force temporarily in order to resolve a problem. The main reason being as temporary patches. By doing so, the programmer can be certain that a certain input or output is energized or de-energized.Īlthough it may seem simple, forces do require some thought and more often than not are heavily utilized for the wrong reasons. The primary purpose of PLC Forces is to either enable or disable an input or output residing within the PLC Program. It’s something with which you need to deal on a regular basis and something you should have in your toolkit as a competent PLC Programmer. PLC Forces is an important tool which can be easily misused.
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