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 name | Function code (hex) |
| Basic | Read Holding registers | 03 |
| Base | Write Multiple registers | 10 |
| Regular | Read Coils | 01 |
| Regular | Read Discrete Inputs | 02 |
| Regular | Write Multiple Coils | 0F |
| Regular | Diagnostic | 08 |
| Supplementary services | Read Input registers | 04 |
| Supplementary services | Write Single Coil | 05 |
| Supplementary services | Write Single register | 06 |
| 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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