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Chapter 7 – Fault Tracing
7-4
Installation and Start-up Guide for NMBP-01
MSTR Block Error Codes
Modicon PLCs communicate on Modbus Plus using the MSTR block. This
block is described in detail in the Modicon ladder logic programming manu-
als, but for reference purposes, the MSTR block error codes are listed below.
If the MSTR block detects an error, a hexadecimal error code will be dis-
played in the first implied register in the control block (the top node). The
form of the code is Mmss, where
•
M represents the major code
•
m represents the minor code
•
ss represents a sub-code.
Hex Error Code
Meaning
1001
User-initiated abort
2001
Invalid operation type
2002
User parameter changed
2003
Invalid length
2004
Invalid offset
2005
Invalid length and offset
2006
Invalid slave device data area
2007
Invalid slave device network area
2008
Invalid slave device network routing
2009
Route equal to your own address
200A
Attempting to obtain more global data words than available
30ss*
Modbus slave exception response
4001
Inconsistent Modbus slave response
5001
Inconsistent network response
6mss**
Routing failure