PM861 and ABB CP600 Panel Communication
I have a project with ABB System 800xA which has a controller two redundant PM861. All the problems has solved up to a point. I have an ABB CP600 panel and ı dont buy any communication card for this. I have an CI853 card as an option. I know that CI867 Modbus TCP card is among the solutions, yet my project budget is already finished, so ı cant buy any card.
I need urgent proposals about my problem.
There is no official support for configuring a Modbus RTU slave on the CI853 or COM3 ports.
In theory, it is possible to do this using the free form serial communications library available in the AC800M, and I guess this is what someone in Argentina has done. If you have the time and expertise then you could proabably do this yourself. However, it is not a trivial exercise to write a serial interface. But if your engineering hours have no cost then this is the only "free" solution. ( Personally, I would allow at least 80 hours plus some money for buying a serial port analyser program to debug the link )
Your best solution is a slave-to-slave gateway like this -> http://www.hms.se/products/products.a...
While you say you have no budget, honestly, by the time you cost your hours spent programming, debugging and supporting a one-off modbus slave interface you are probably much better off just spending the few hundred bucks that this unit costs.