Passthru/Passthrough communications to PLC via T10A

[PeteLam]

I was just wondering if this is possible. If so, I could use some direction in setting this up.

I use T7A/T10A screens with Panasonic PLC's. The PLC connects to the HMI via RS-232 through the COM1 port, typically at around 38,400 baud, but I'm flexible.

I use an ethernet cable for programming the TxA. Currently, it is just a peer-to-peer connection with my laptop, but I have also been successful at connecting through a hub/switch.

Is it possible to use the ethernet connection as a bridge for my RS-232 communications? What I would like to be able to do is transfer PLC programs using the HMI as a passthrough conduit. I've been able to do this with Panasonic HMI's, but those have all talked to the laptop via RS-232.

If this is not possible using ethernet, would it be possible if I connected to the HMI via COM1 or COM3?

[mark.monroe]

It depends on your driver. I am not sure what driver you are using. If you go to the driver's setting and you see a pass through mode, then you should be able to do it. Here is a screen shot of the QnA/Qnn Serial driver which allows pass through. If you click on the help button, it you should be able to find out how the pass through mode works for that driver.

Snap 2013-09-17 at 09.05.22.jpg (49.22 KiB) Viewed 8723 times

[PeteLam]

Thanks Mark.

I will give this a try.

FWIW, I am using the Matsushita/MEWTOCOL driver.