Modbus Error Codes - YASKAWA GPD 515/G5 Modbus RTU Technical Manual

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:
The following table indicates the fault code for the specific type of fault that occurred.
Error Code
01h Function Error
02h Register No. Error
03h No. of Registers
21h Data Setting Error
22h Write-in Error
GPD 515 Fault Codes
The GPD 515 drive can have a drive fault, such as undervoltage, overload, external fault, etc.
When a drive failure occurs, it can be classified as an alarm, a minor fault, or a major fault. The
drive reacts differently with each type of failure. An alarm displays a warning indication, however
operation continues. Minor faults allow continued operation, and a contact will close only if one of
the multi-function outputs is set up as a minor fault contact. The major faults cause the motor to
coast to stop, and the fault signal output is present at terminals 18-20.
The GPD 515's parameters U2-01 (Current Fault), U2-02 (Last Fault), and U3-01 through
U3-04 (Last Fault; Fault Message 2, 3, & 4) each display a fault code representing the drive
failure. The following table indicates the abbreviation displayed on the Digital Operator and the
hexadecimal code viewed in drive parameters U2-01, U2-02 and U3-01 when a specific drive
failure occurs. The table also indicates whether the drive failure is an A – alarm, m – minor fault,
or M – major fault.
SLAVE ADDRESS
80h + FUNC. CODE
ERROR CODE
UPPER
CRC-16
LOWER
Figure 8-1. Fault Response Message
Name
Function Code other than 3, 8, or 10 (hex)
Unregistered Register Number
Number of registers > 16
Attempted to write beyond register's data limits
Write function is disabled for specified register
xxh
xxh
03h
xxh
xxh
Fault Content
Error Codes and Troubleshooting 8-3