Hello, My client has different make of plc's installed on different machines within the plant. Now what our need is to communicate all these different plc's over single network i.e. ethernet. Basically we are installing new ABB make controller along with SCADA for monitoring all other installed plc data at single point. So that operator will able to control all machines from control room only. The existing plc make are OMRON, AB, SIEMENS. Each plc has a spare RS232 port. Please give me solution on this topic and also what type of RS232 to ETHERNET converter should i use