Issue
When a modbus AO is created and set to 32-bit real swapped, the correct value is not seen at the modbus device.
- 1000 is written and 1000 is shown correctly at the Modbus device.
- 1001, 1002, 1003 are written but 1000 is seen at the Modbus device.
- 1004 is written and 1004 shows correctly at the Modbus device.
- And so forth. The larger the number, the larger the error increase.
Product Line
EcoStruxure Building Operation
Environment
- Enterprise Server (ES)
- Automation Server (AS)
Cause
When 32 bit real swapped is selected
Further down the configuration page, the write function code defaults to "06". 06 is to set a single 16-bit register write and this needs to be changed.
Resolution
Use the drop down tab and set the function code to "16". 16 is to preset multiple registers i.e. 2 off consecutive 16-bit registers or a 32-bit register.
