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Hello all,
My first post here.
I've been asked to "re-design" a hydroponic greenhouse system that is PLC based. PLC talks vis RS-232 to a PC running some CX-programmer software that monitors sensors, which then talks to Excel for calculations, which then sends commands to the PLC to switch pumps and motors.
I would like to maintain as much of the existing system as possible to avoid rewiring anything as this is properly executed.
What I want to do is read inputs from the PLC, generate my own control logic and send back commands. Effectively I want to get rid of CX and Excel. I would use an industrial pc with (RT)Linux.
I want to reuse some ADAM 4520 converters as I'm a a distance to the site.
My questions are these:
1. Is my approach sound. I have programming experience so the software part is ok. I do not want to become a CX programmer, and neither do we have "sources" for the existing program.
2. Can some one give me a couple of basic commands to test communications with. I am reading up on host link currently.
3. I am guessing that the PLC does not have any program stored, it's all in the CX. Anyway to verify this?
Last time I played with RLL was 30 years ago.
sincerely,
nick boretos
My first post here.
I've been asked to "re-design" a hydroponic greenhouse system that is PLC based. PLC talks vis RS-232 to a PC running some CX-programmer software that monitors sensors, which then talks to Excel for calculations, which then sends commands to the PLC to switch pumps and motors.
I would like to maintain as much of the existing system as possible to avoid rewiring anything as this is properly executed.
What I want to do is read inputs from the PLC, generate my own control logic and send back commands. Effectively I want to get rid of CX and Excel. I would use an industrial pc with (RT)Linux.
I want to reuse some ADAM 4520 converters as I'm a a distance to the site.
My questions are these:
1. Is my approach sound. I have programming experience so the software part is ok. I do not want to become a CX programmer, and neither do we have "sources" for the existing program.
2. Can some one give me a couple of basic commands to test communications with. I am reading up on host link currently.
3. I am guessing that the PLC does not have any program stored, it's all in the CX. Anyway to verify this?
Last time I played with RLL was 30 years ago.
sincerely,
nick boretos