Chapter 6 Transfering Data with the MSTR Instruction
MSTR Function Error Codes
Where Displayed
If an error occurs during an MSTR operation, a hexadecimal error code will be displayed in the first implied register in the control block (the top node). Function error codes are network-specific.
TCP/IP Ethernet
Error Codes
An error in an MSTR routine over TCP/IP Ethernet may produce one of the following errors in the MSTR control block:
2003
2004
2005
2006
3000
30ss*
4001
F001
Hex Error Code Meaning
1001 User has aborted the MSTR element.
2001
2002
An unsupported operation type has been specified in the control block .
One or more control block parameters has been changed while the
MSTR element is active (applies only to operations that take multiple scans to complete). Control block parameters may be changed only when the MSTR element is not active.
Invalid value in the length field of the
Invalid value in the offset field of the control block .
control block .
Invalid values in the length and offset fields of the
Invalid slave device data area.
Generic Modbus fail code.
Modbus slave exception response.
Inconsistent Modbus slave response.
Option Module not responding control block .
* The ss subfield in error code 30ss is shown in the following table
.
04
05
06
ss Hex value
01
02
03
07
Meaning
Slave device does not support the requested operation.
Nonexistent slave device registers requested.
Invalid data value requested.
Slave has accepted long-duration program command.
Function can’t be performed now; a long-duration command is in effect.
Slave rejected long-duration program command.
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