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4-6 Series 90™-30 PROFIBUS Slave Module User's Manual – August 2004 GFK-2193A
4
COMMREQ Status Word
The following table defines the format of the Status Block used during the COMMREQ
handshake.
Status Word Format
Word Name Description
1 State
(See “Status Word State
Codes” below.)
The state of the current COMMREQ request
2 LostCommand Command code of the last command lost when
the CRL bit is set in Flags.
3 ErrorCode Not Used
4 AdditionalCode Additional code for error reporting
Status Word State Codes
Value Description
0 Module has not yet processed the COMMREQ
1 Command Complete
Note: This status does not necessarily mean success. Some commands have
reply data that must also be checked.
2 Command Terminated – module busy
3 Command Terminated – invalid command
4 Command Terminated – invalid command data
5 Command Terminated – not enough data
6 Command Terminated – command collision
An identical command, which has already reported completion, is currently being
processed and has not replied yet.
7 Command Terminated – not enough memory in reply area
The command did not specify sufficient PLC memory for the reply. Command will
be ignored.
8 Command Terminated – command-specific error. See ErrorCode and
AdditionalCode in the Status Block for more information.
9–255 Reserved