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Hi,
I am currently seeing control system architecture for one of the projects, and there is something that I don't understand.
Summarize it a bit:
Level Transmitter is connected to a data hub via 2 connections a TRL/2 Field bus, and a Modbus.
The TRL/2 Field Bus goes to a field bus modem and to the operator.
The Modbus goes to the I/O Rack, and the I/O Rack links with the Processor (PLC) via ControlNet.
The I/O Rack links to the Pakscan via Modbus.
I understand the advantages of ControlNet over other communications links such as DeviceNet and Ethernet as it provides scheduled data on time (real time).
But What I don't understand why can't we link I/O Rack and the Data hub via a ControlNet instead of Modbus.
The PLC will get the information in real time, but the I/O Rack won't get the information/data in real time, then the PLC is not getting info/data in real time.
Thank you in advance.
I am currently seeing control system architecture for one of the projects, and there is something that I don't understand.
Summarize it a bit:
Level Transmitter is connected to a data hub via 2 connections a TRL/2 Field bus, and a Modbus.
The TRL/2 Field Bus goes to a field bus modem and to the operator.
The Modbus goes to the I/O Rack, and the I/O Rack links with the Processor (PLC) via ControlNet.
The I/O Rack links to the Pakscan via Modbus.
I understand the advantages of ControlNet over other communications links such as DeviceNet and Ethernet as it provides scheduled data on time (real time).
But What I don't understand why can't we link I/O Rack and the Data hub via a ControlNet instead of Modbus.
The PLC will get the information in real time, but the I/O Rack won't get the information/data in real time, then the PLC is not getting info/data in real time.
Thank you in advance.