In AB plc, B3 is a bit file; I’d like to know how it is controlled
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In AB plc, B3 and N7 are bit files. I would like to know how they are controlled; it’s not possible to assign values during simulation – are there any actual I/O points? ? ? (The system I use is RSLogix 500)
B3 is, N7 is not; N7/0 is a bit that can be used in calculations and can come from an actual OI. Your question is rather strange, which is why everyone didn’t understand it. Are you using the MICROLOGIX series of PLCs from AB?
If no program is writing to the elements in these files (B3, N7, etc.), they are all readable and writable； If there are programs writing to them, then their values are determined by those programs. The I/O points correspond to the I1 and O0 files.