twetechnics
Member
MY customer's plant has a Main PLC (SLC 5/05) which communicates with one CompactLogix and three other SLC 5/05's. There are Six (6) PC's with OPC servers communicating (Read/Write) with the main PLC. All of these devices share an ethernet newtork and it is VERY SLOW. The question is what is the best practice for a network such as this. Should we add another ethernet card to the Main PLC and have that communicate with the OPC servers? Should we use a different communications method for the PLC Only Network? The I/O count on the network is approximately 300 Digital I/O and 200 Analog I/O plus another 500 registers.