edpuente Posted January 16, 2013 Report Posted January 16, 2013 Hi: I have a 4 cj1m plc in a clk network with a cqm1h. I want to send info back and forth with the cqm1h only with one cj1m using send and recv instructions. Do I have to write only a send command in one PLC, or I need to program the recv instruction in the receiving data plc.? Since I already have the 4 CJ1M trough datalinks, is it possible to send messages without collison of data? Regards And have agreat day.
Michael Walsh Posted January 17, 2013 Report Posted January 17, 2013 You need to do a send on 1 PLC or a Receive on the other, not both. It is kind of like read or write. There will be no problems with collisions.
lostcontrol Posted January 18, 2013 Report Posted January 18, 2013 (edited) You could probably even use the in-built PLC-PLC links, think that will work between 2x PLC serial ports... Edited January 18, 2013 by lostcontrol
edpuente Posted January 20, 2013 Author Report Posted January 20, 2013 Thank You! I could not make it work. I guess it has problems if you want to use datalinks and send or recv at the same time. I just decided to use datalinks. it was easier to do by me.
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