PM556-TP-ETH — How to change IP address without overwriting the PLC program?

jroddball79 — Fri, 22 May 2026 09:52:50 -0000

Still looking for a solution. I have gathered more information that might help:

Device: ABB AC500 PM556-TP-ETH
Firmware version: 2.4.2.14993 (dated 2014)
Open ports confirmed: 502 (Modbus TCP), 1200 and 1201 (CODESYS runtime). SSH (22) and HTTP (80) are not reachable.
No SD card in the PLC.

I can connect via Automation Builder using the current IP and Online Login works, but I have no original source project available. Automation Builder requires a full PLC download to apply IP changes, which we want to avoid as it would overwrite the running program.
Any guidance on how to change the IP without a full download would be greatly appreciated.

I am also open to solutions using third party tools, DCP protocol, or scripts.

Thank you

PM556-TP-ETH — How to change IP address without overwriting the PLC program?

jroddball79 — Wed, 20 May 2026 13:48:51 -0000

We have checked open ports. SSH (22) and HTTP (80) are not reachable. The only open ports are:

502 (Modbus TCP — used for lighting control)
1200 (CODESYS runtime)
1201 (CODESYS runtime)

We can connect via Automation Builder using the current IP, but we don't have the original project source — only an empty project. This is why we are afraid of doing a full download, as it would overwrite the running application.

Is there any way to change the IP through the CODESYS runtime protocol on ports 1200/1201 without affecting the running program?"

PM556-TP-ETH — How to change IP address without overwriting the PLC program?

jroddball79 — Tue, 19 May 2026 14:59:26 -0000

Hi,
I need to change the IP address of an ABB PM556-TP-ETH using ABB Automation Builder. The situation is:

I have connectivity to the PLC using the current IP (configured in Communication Settings)
Online Login works fine
The Network Scan does not detect the PLC
IP-Configuration tool shows all fields disabled
I don't have the original project source, only an empty project
The PLC has no SD card inserted
The Online menu does not show an Upload option

When I modify the IP in the project and connect, Automation Builder shows:
"The PLC configuration needs to be updated. A full PLC download is required"

I'm afraid a full download will overwrite the running program. Is there any way to change only the IP address without overwriting the application?

I'm also open to solutions using third-party tools, Python scripts, or any other method (DCP protocol, direct TCP communication, etc.) as long as it doesn't overwrite the running application.

Thank you

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