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What Modbus Function Codes are supported on the Magelis that are using Vijeo Designer Runtime?
Issue
What Modbus Function Codes are supported on the Magelis that are using Vijeo Designer Runtime?

Product Line
Vijeo Designer Runtime
Harmony HMIGTO/GTU/STO/STU, Magelis XBTG/GH/GK/GT, Magelis iPC, Panel PC, Box PC

Environment
Physical HMI

Resolution
Below is the Table of Modbus function codes used by the Magelis/Harmony HMI families running Vijeo Designer.
Classes Function nameFunction code (hex)
BasicRead Holding registers03
Base Write Multiple registers 10
RegularRead Coils 01
RegularRead Discrete Inputs02
Regular Write Multiple Coils0F
RegularDiagnostic08
Supplementary servicesRead Input registers04
Supplementary servicesWrite Single Coil 05
Supplementary services Write Single register06
Supplementary services Read Device Identification (only for Modbus TC/IP with target machine server)2B

By default the HMI uses the Function Code 10 (FC 10) to write multiple registers.
However, some devices do not know this function code. When a device doesn’t know FC 10, the HMI will automatically use (without any error code) FC 06.
In the same way, the HMI will use FC 05 instead of FC 0F. In addition, FC 06 and FC 05 will always be used if Preferred Frame Length is set to Minimum possible.

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