C
In a system with one PLC providing process control and monitoring a series of pump VFD's and process water chillers, we wish a second PLC to be "backup". If the main PLC fails, the second PLC would take over operation. is this possible to have two master PLC's on a MODBUS TCP/IP network?
During normal operation, the main PLC (IDEC)read / writes to the pump VFD's and chiller Microprocessors. The backup PLC is actually the customers DCS that runs the plant. We would like the DCS PLC to also read from the VFD's and chillers simultaneously. In the event of a fault in the main PLC, the DCS would then have the ability to take over operation of the system.
This setup would require there are two master controllers on the MODBUS system. Is this possible? All devices (IDEC PLC, DCS, VFD's, Chillers)on the system are homerun to an Ethernet IP hub.
Thanks for your advice!
Cam
During normal operation, the main PLC (IDEC)read / writes to the pump VFD's and chiller Microprocessors. The backup PLC is actually the customers DCS that runs the plant. We would like the DCS PLC to also read from the VFD's and chillers simultaneously. In the event of a fault in the main PLC, the DCS would then have the ability to take over operation of the system.
This setup would require there are two master controllers on the MODBUS system. Is this possible? All devices (IDEC PLC, DCS, VFD's, Chillers)on the system are homerun to an Ethernet IP hub.
Thanks for your advice!
Cam