toshiba Toshiba T3 PLC to RS-485 via Computer Link (data extraction)

[artichoke72 0]

Hi everyone,

I need to interface an external PC that will request data to a Toshiba T3 CPU (model PU326H) from several 'F' registers.

The external PC sends data via RS-232 to a RS-232 <-> RS-485 converter, then that converter sends data via RS-485 to the Toshiba T3 PLC "Computer Link" port, located on the bottom of the Toshiba T3 PLC.

The setup I have enabled so far is as follows:

• Select System Parameters
• Inside Computer Link Setup, choose the station (=1)
• Inside Computer Link Setup / Communication Parameter choose Baud rate = 19200, Parity=None, 8 data bits, 1 stop bit

See full setup visible from the attached file (PDF).

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The problem I am having is that while I can send data via the RS-232 converter, no data is sent back from the Toshiba PLC.

Has anyone ever setup the Computer Link port on a Toshiba T3 PLC? Any clues as to what is causing the issue I am observing?

Any help is appreciated, thank you.

Regards to all MrPLC members!

 

PM3 overview for Toshiba PLC experts.pdf

Edited 21 Feb 2017 by artichoke72
Clarified title, added one attachment file (PDF)