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890USE17700 April 2004 137
Modbus Error Codes
Introduction During operations, you may encounter Modbus error codes that are returned by the
STB NIP 2212 NIM to the Advantys configuration software. These error codes are
displayed as byte codes in hexadecimal format.
General Error
Codes
Note: Because the STB NIP 2212 NIM supports Modbus over a serial interface,
the Ethernet-based Modbus server does not support Modbus requests with a unit
ID of 255 (0xFF). In the PL7 programming tool, the default value for the field unit
ID when adding an I/O scanner connection is 255 (0xFF). Be aware that the NIM
drops packets with this unit ID.
Error Code Error Type Description
0x01 Illegal function This error code is returned when the Advantys
configuration software attempts to modify the
configuration of the STB NIP 2212 when the software
does not have control.
0x03 Illegal Modbus
data value
This error code may indicate any of the following
conditions:
the function code contains incorrect data
a request is being issued while the NIM is in the
wrong operating mode—for example, COMM state
protected
you have entered the wrong password