OPC instead of modbus
we are using modbus rtu for communicating between DCS (abb800xa) and ESD (HIMA) and since low speed transmission between these two we are going to use OPC instead. couple of question have raised for me. 1- does OPC is reliable and would speed improve? 2- does OPC would be installed on connectivity server or other servers (we have to control network and 2 * 2 connectivity server)? does it need to be reduanded and if so is it possible make redundant two opc? does OPC need license and how many? what are disadvantages of using OPC and problems that may occur? and finally and more importasntly does it affects system load compared to using modbus? system load would decrease or increase?
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