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I think you are going to have to give us a little more detail about what it is you are after. PLCRunning is %S12 in the CPU. I do not believe that information resides in a (IO or Device) DDT anywhere (but maybe I am wrong). You mention OFS, are you perhaps looking at a user DDT in the PLC that contains the system bits and words, or perhaps you are looking at a tagname that resides at that system bit?
For example, has someone done this - defined all the system bits with tags, and you are referencing the tag?:
As detailed in the help of the system bits:
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I think you are going to have to give us a little more detail about what it is you are after. PLCRunning is %S12 in the CPU. I do not believe that information resides in a (IO or Device) DDT anywhere (but maybe I am wrong). You mention OFS, are you perhaps looking at a user DDT in the PLC that contains the system bits and words, or perhaps you are looking at a tagname that resides at that system bit?
For example, has someone done this - defined all the system bits with tags, and you are referencing the tag?:
As detailed in the help of the system bits:
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