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How is the output word looked at in binary on the HI 1756WS?

Last updated 04/07/2014 08:38 AM

Question

When you put the Control Logix module in the RACK and follow the manual instructions, the OUTPUT word is configured as a real (float). What must we do to allow it to be viewed in binary, so we can use it to give commands to the module?

Answer

Using an HI 1756WS or HI 1756-2WS, when the STATUSWORD is returned from the module it is in REAL (float) format. This makes it difficult to monitor for individual bits. The easiest way to solve this situation is to do a copy command and copy the STATUSWORD into a DINT tag. The processor will do the necessary conversion and the new DINT can be monitored for individual bits as needed.

If you are trying to send a command to the module from the PLC using the output table, the reverse would be true.  Since the output word is a REAL value, you would set the bits you need turned on in a DINT tag, then "COPY" this tag into the output location.