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Showing results for tags 'coil'.
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Hello, I have an M2I Top RW (model: 1000WD) connected to a Schneider Modicon M221 PLC. The HMI is connected and I is working perfectly reading data from the PLC via ethernet. I can't seem to find a way to write to the PLC from the HMI. I would like to control the PLC from the HMI, I know this is possible with Fatek PLCs with the same HMI model. please help - how would I create a bit command from the HMI to the PLC? what registers? what inputs in the PLC? thanks
I have heard "Don't use SET or duplicate coils". I kind of agree, so how do you handle it? Do you use logic to control coil A1 and other logic to control coil A2. Then coil A is controlled by either A1 or A2. Do you use logic to SET or RST A and other logic to SET or RST A. Please realize the logic is not as simple as stated above. not simply condition 1 or condition 2 then out A.
Hello system is Q06UDEH GX developer 8116W Large system 2 PLcs with 60K lines of code between them, SFC ladder, Issue, all conditions HIGH, coil not ON or visa versa (not all condition ON but coil high) also happen with data comparisons, moves etc. what i have looked at so far, -batch monitor confirms HIGH/LOW states - programs all scanned (all 35 of them) -no MC control ( some CJ and for NEXT seems unrelated) -force history is clear - not willing to rest CPU as this is a large press and it is running -widespread condition throughout the code - only monitor one window at a time Q - is there some monitor setting that I haven't found? over lapping registers Have gone online with original backup just to make sure something didn't happen with the read. No way i'm doing an edit when I cant tell whats going on with this. thanks!
So I was out in the field a few days ago and encountered an issue I have never run in to before on a Micrologix 1400 using RSLogix 500. All was going well when I was checking the I/O's until I realized that although I would get an input, the virtual output (B3) would not turn on... I have encountered something similar in Siemens programming where if you accidentally have 2 coils using the same register, they act as an AND instruction. When I was completely stumped I decided to make a completely new program and just put a few inputs and a few coils in, and everything worked fine... Could this be some sort of memory overlapping issue I am having? Any advice or tips would be greatly appreciated.