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Chapter 7 – Fault Tracing
MSTR Block Error Codes
7-4
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
1001
2001
2002
2003
2004
2005
2006
2007
2008
2009
200A
30ss*
4001
5001
6mss**
User-initiated abort
Invalid operation type
User parameter changed
Invalid length
Invalid offset
Invalid length and offset
Invalid slave device data area
Invalid slave device network area
Invalid slave device network routing
Route equal to your own address
Attempting to obtain more global data words than available
Modbus slave exception response
Inconsistent Modbus slave response
Inconsistent network response
Routing failure
Installation and Start-up Guide for NMBP-01
Meaning
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