8-2 Error Codes and Troubleshooting
Communication Error
Once the data sent from the PLC is received by the drive, the received data is checked for CRC,
parity, overrun, framing, and receiving buffer overflow. If all checked items pass, the data has been
received normally. A communication error (CE) is declared if any data item cannot be received
within 2 seconds.
The GPD 506 drive will operate according to the setting of parameter n102 when a communication
error (CE) occurs. The settings of n102 are as follows:
n104 Setting Description
0 Deceleration (n019) to stop after CE occurs, and the
Digital Operator flashes ‘CE’.
1 Coast to stop after CE occurs, and the Digital
Operator flashes ‘CE’.
2 Deceleration (n021) to stop after CE occurs, and the
Digital Operator flashes ‘CE’.
3 Operation continues after CE occurs, and the Digital
Operator flashes ‘CE’.
The default setting of n102 is ‘1’.
Modbus Error Codes
If there is an error in the command message, an error code will be returned in the response
message. A fault response message is structured as follows:
Figure 8-1. Fault Response Message
The following table indicates the fault code for the specific type of fault that occurred.
Error Code Name Fault Content
01h Function Error Unregistered Function Code
02h Register No. Error Unregistered Register Number
03h No. of Errors Number of errors > 16
21h Write-in Limit Error Upper/Lower limit exceeded in write-in data
22h Write-in Error Write-in is disabled for the register specified
xxh
SLAVE ADDRESS
xxh
03h
xxh
xxh
CRC-16
UPPER
LOWER
ERROR CODE
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