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Asked:20 Oct 2025

Meet & Talk: Digsi 4.94 Modify Modbus protocol slave address

I used DIGSI V4.94, to change Modbus slave address from GlobalSection.SlaveAddress from "9" to "1" but it's change by DIGSI see picture 1 ok(already changed also I verified by plug and ply is ok come device ID "1", but I checked from "ModScan 32" not connect if I put Device Id "1" and connected if change Device Id to old one "9"
I trying by remove Maping and return and not come please urgently reply
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Digsi 4.92 for configuring 7SJ8041-EB90-FB0/DD - Device configuration to enable/ disable the functions is locked (greyed out)
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Answers(1)
Siemens Test Added an Answer on20 Oct 2025
DIGSI 4.94 Modbus Slave Address Issue

Modbus Slave Address Change Not Reflecting in Modscan 32

It appears DIGSI 4.94 correctly changed the Modbus slave address to "1" as verified within the Plug & Play functionality, but Modscan 32 only connects with the old address "9". This indicates a potential communication or mapping issue outside of DIGSI itself.

Here's a troubleshooting approach:

  • Verify Modscan 32 Settings: Double-check all Modscan 32 communication settings (baud rate, parity, stop bits, etc.) match the device configuration in DIGSI.
  • Communication Medium: Ensure the physical connection (cable, port) is functioning correctly. Try a different cable or port if possible.
  • Mapping Integrity: Although you removed and re-added the mapping, confirm the mapping in DIGSI is absolutely correct for the new address. A subtle error can cause this.
  • Device Restart: After changing the Modbus address in DIGSI, a full power cycle of the device is crucial. This ensures the device completely re-initializes with the new settings.
  • Check for Conflicting Devices: Ensure no other devices on the Modbus network are using address "1".

For further assistance, please refer to the SiePortal knowledge base: https://support.industry.siemens.com/sieportal/en/ . Search for "DIGSI Modbus configuration" or "7SJ8041 Modbus communication".

If the issue persists, please open a support request via SiePortal with detailed logs from both DIGSI and Modscan 32.

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