7 Modbus TCP/IP Messaging
YASKAWA ELECTRIC SIEP C730600 59A V1000 Option Modbus TCP/IP Technical Manual 31
Modbus TCP/IP Exception Codes
An error may occur when the option responds to a command. The response message will contain one of the Error Codes
defined in Table 3 7.
Table 37 Modbus TCP/IP Exception Codes
Control Connection Timeout
The option has a safety feature that declares a fault if communications between the master and drive is lost after the
master commanded the drive to run.
A controlled connection is defined as one in which a master commands the drive by writing to register 01H. After this
write, the option will begin a timer. The timer will be reset upon subsequent writes to register 01H. If the timer exceeds
the value programmed in drive parameter F7-16, then the option will declare a BUS ERROR to the drive. A value of 0 in
F7-16 means that the timeout is disabled.
The drive reaction to a BUS ERROR is programmable through drive parameter F6-01.
Error Code (H) Error Name and Cause
01
Function Code Error.
Attempted to set a function code from a PLC other than 03, 06, 10, or 17 (H).
02
Register Number Error.
A register number specified in the command message does not exist.
03
Bit Count Error.
• Invalid command message quantity
• In a write message, the value for write byte count does not match twice the value of the stated quantity of registers to
write
21
Data Setting Error.
• Control data or parameter write data is outside the allowable setting range
• Attempted to write a contradictory parameter setting
22
Write Mode Error.
• Attempted to write while the drive was operating to a parameter that cannot be written during run
• During an EEPROM data error (CPF06), the master attempted to write to parameter other than A1-00 to -05, E1-03, or
o2-04
• Attempted to write to a read-only register
23
DC Bus Undervoltage Write Error.
• Attempted to write from the master during an undervoltage fault (Uv1)
• Attempted to execute an Enter command during Uv1
24
Write Error During Parameter Process.
Master attempted writing to the drive while the drive was processing parameter data.
Modbus_conditional_E.fm 31 ページ ２０１２年３月７日 水曜日 午前１１時３１分
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