In the meantime I made some tests, using Ethernet. So I would need extra cabling and communication extension Lmabay: It can only exchange data between certain registers (up to 100) and, the way I understand it, the read and write area is defferent so I still need a lot of extra programming, if it’s possible at all.īesides that, PLC link uses it’s own network to connect the PLCs together. PLC link is very limited, compared with what I need. This way I will be able to reuse each HMI screen for any PLC that is currently selected. The user changes the selected PLC ID and then HMI starts showing data from the new PLC. What I need is HMI to be able to communicate with one PLC at a time. My data is spread all over the PLCs memory, as it is normal for a big program that uses a lot of data registers for read or write between HMI and PLCs.
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