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I have problem with Modbus communication between Simatic PLCs. In Master PLC I use function blocks P_SND_RK and P_RCV_RK, and I don’t know where I should put slave address. I need specify slave PLC because number of slaves is greater than one.
I have also problem with cable. In documentation there is no information about value of resistance between signal cables (TXD and RXD). Is this resistor necessary.
Best regards
mareki
I have also problem with cable. In documentation there is no information about value of resistance between signal cables (TXD and RXD). Is this resistor necessary.
Best regards
mareki