Hi,
I'm investigating the feasibility using an old PV standard display with a Logix controller via the controller serial port.
We have multiple PV standard units available in excellent condition, so this is a worthwhile use of these otherwise obsolete resources - if it is possible.
The PV's are part number 2711-K10C3. The communication protocol for these is DH-485 (i.e. DH485 over an RS485 physical layer).
Work by others with a 2711-K6C5 (which has a RS232 physical layer but uses the DH-485 protocol protocol) has shown that the communication is possible using SLC mapping in the L5X to "trick" it into thinking it is talking to a SLC and configuring the com ports on both the L5X controller and the PV to DH485. Here is a link to the white paper: http://folk.ntnu.no/skoge/prost/proceedings/afcon03/Papers/048.pdf
The obvious caveats are that the serial port on the processor is no longer available for programming or configuration and that only one PV can be used per controller.
Can anybody advise if I can I simply use an RS485 to RS232 converter to bridge the physical layer difference? Would an old 1761-NET-AIC work for this?
I've looked for information in Rockwell Knowledgebase (we have a limited support contract), but I can't find anything specific.
I do not have a non-production controller to experiment with and I have no intention of risking damage to a production unit by experimenting.
Any comments or advice greatly appreciated.
