DH485 RJ45 switch or hub

[Googs91 0]

Ok I have beat my head against the wall for long enough trying to research this.

Im running a AB SLC5/03 and a HMI from Parker P11

The PLC and HMI are communicating on DH485. The communication cable is a RJ45 to the PLC and a DB9 Female at the HMI.

Problem im having is I need to communicate with the plc with out disconnecting the HMI. The RS232 port on the PLC seems to have an issue with communication.

is it possible to run a switch or hub between the PLC and HMI so I can plug my 1747UIC RJ45 plug into the switch or hub and be able to communicate with the PLC?

 

Any help would be much appreciated.

[ratcliffe_ic 2]

I have connected 2 dtam units to one slc 5/03 with an rj11 (I think) splitter.  You might be able to use this as a method but I have not ever attempted this.

[Mickey 71]

With the proper  cables (and your UIC) an AIC+ will work for this.

See pdf

 

What is the issue with the RS232 port?

How is the RS232 port  configured? Check the offline file.

We might be able to help solve the "issue".

1761AIC+.pdf

Edited 8 Sep 2019 by Mickey

[Googs91 0]

I have tried over and over again trying to connect to the rs232 port with no success. I have attached the channel config.

[Googs91 0]

I need to pin out my DB9 cable to make sure its a null modem cable. Im not 100% sure its a null modem cable.

[Mickey 71]

1 hour ago, Googs91 said:

I need to pin out my DB9 cable to make sure its a null modem cable. Im not 100% sure its a null modem cable.

that would be key of course.

If you can get online at all thru the DH485 port then I would change the control line protocol to no handshacking. That way a 3 wire null modem cable should work.

You may need a null modem cable with handshacking lines to get connected with how its set up now. ( I no expert on that though)

 

Edited 8 Sep 2019 by Mickey

[Googs91 0]

Ok I will try that. I have no problem connecting over DH485.

[Mickey 71]

Not all USB to serial adapters work. What brand do you have?

If that is what you are using to connect to the serial port.

[Googs91 0]

 

Just now, Mickey said:

Not all USB to serial adapters work. What brand do you have?

If that is what you are using to connect to the serial port.

this is the one I am using.

[Mickey 71]

The UIC is for DH485 only. The serial port would have to be configured for DH485.

You can configure it for DH485 if you want.

Or get yourself a good USB to serial adapter. See link for a good one.

 

https://www.plccable.com/allen-bradley-slc-500-usb-1747-cp3-1756-cp3-slc-5-03-04-controllogix/

[Googs91 0]

Now that makes a lot of sense. Just picked up an adapter. I will give that a shot.