Panasonic FP-XH Series User Manual page 113

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Response in abnormal status
In case a parameter disabled to be processed is found in a command (except transmission
error)
Slave address (Unit No.)
Function code + 80H
Error code
CRC
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Error code contents
1. Function code error
2. Device No. error (outside the range)
3. Device quantity error (outside the range)
WUME-FPXHCOMG-02
1, 2, or 3
10.3 MODBUS RTU Format
10-9