transfer data stream into PLC

[ClaudeCSE]

Hi every body,
I would like to know how to transfer data stream from analytical instrument RS-232, Modbus RTU protocol into a Modicon PLC. What SOFTWARE should I use to program the PLC for it to collect data into the registers? Thanks.

Claude

 

[Macbeth]

What modicon do you have? Some modicons only have slave mode suport for there ports.
Does your modicon have MB+? It would be posable to install a bribge mux.
Does your inst suport master mode? Where it can write or is it only a slave? Some times on inst such as you may have, ther is a print option to feed data out.

 

[ClaudeCSE]

- We have a Quantum 140CPU11302 with a MB and a MB+.
- The inst havs a MB interface board (RTU protocol on an RS-485 two wire connection at 9600 bauds) where the data is placed in 16 bit unsigned registers.

 

[Macbeth]

OK as I understand the quantum comms port is only supported as a slave port. What that means is the quantum cannot request data from another device. However a device may act as a master and read and write through that port. Also the port is RS232 so you would require an adapter (RS232 > RS485).

There is a modbus II card witch can be installed, along with an software loadable to work past this. These cost about $2k.

But there is a better product BM85S, this device will add four rs232 or RS484 ports to a MB+ network. Then each device will appear as an MB+ node and MSTR will work fine.
These cost about $2k. I have used many of these and found them very easy to use.

Seems like you would think a modicon PLC would be able to establish modbus host read and write Messages to otter modbus devices, But when I have asked about this they always say we are working on a loadable that is not available yet.