r6lpq8twg52
Member
Hi,
Seeking consultation on an implementation matter, and have a question about Modicon Compact 984 communication through RS485:
Three Modicon PLCs are operating on an extrusion machine, employing a Modbus Plus network, looking through the ladder logic, there seems to be a lack of MB+ commands, indicating a viability for a Modbus TCP implementation. The objective is to gain independence from deprecated hardware (416NHM30032 and its analogues) and to develop infrastructure which facilitates further upgrades.
Currently, the prototype configuration involves a computer (Running Wonderware and a DAServer) and a gateway to translate from MBTCP to MBRTU, connecting to a PLC through RS232, this means that there must be three gateways per machine on seven machines. The assumption is that it is preferable to have one gateway per machine which then communicates through RS485 to three RS485/RS232 converters and hence to the PLCs. As the age of the hardware suggests, cost is the limiting factor here. Which option (if any) is the more conventional?
Finally, RS232/RS485 conversion did not succeed for communicating with the PLCs in this instance (Modicon Compact 984-141 and -145) and any knowledge regarding the matter would be helpful. The 232/485 converter works, as successful communication is established between two windows computers. For connecting to the PLC using Proworx (also not operational when using RS485):
- RS232 to RS485 converter: Uotek UT-2201
- Cable pinout: AS W952 012
- USB to RS485 converter: Startech ICUSB422
Each individual component aforementioned performs as desired.
Best Regards,
Seeking consultation on an implementation matter, and have a question about Modicon Compact 984 communication through RS485:
Three Modicon PLCs are operating on an extrusion machine, employing a Modbus Plus network, looking through the ladder logic, there seems to be a lack of MB+ commands, indicating a viability for a Modbus TCP implementation. The objective is to gain independence from deprecated hardware (416NHM30032 and its analogues) and to develop infrastructure which facilitates further upgrades.
Currently, the prototype configuration involves a computer (Running Wonderware and a DAServer) and a gateway to translate from MBTCP to MBRTU, connecting to a PLC through RS232, this means that there must be three gateways per machine on seven machines. The assumption is that it is preferable to have one gateway per machine which then communicates through RS485 to three RS485/RS232 converters and hence to the PLCs. As the age of the hardware suggests, cost is the limiting factor here. Which option (if any) is the more conventional?
Finally, RS232/RS485 conversion did not succeed for communicating with the PLCs in this instance (Modicon Compact 984-141 and -145) and any knowledge regarding the matter would be helpful. The 232/485 converter works, as successful communication is established between two windows computers. For connecting to the PLC using Proworx (also not operational when using RS485):
- RS232 to RS485 converter: Uotek UT-2201
- Cable pinout: AS W952 012
- USB to RS485 converter: Startech ICUSB422
Each individual component aforementioned performs as desired.
Best Regards,