77
Appendix B
Slave Diagnostics Message
The PROFIBUS Communication Unit supports diagnostics to allow the user system to automatically determine
problems, which can occur in the SmartSlice I/O system. The PROFIBUS Diagnostics consists of standard
diagnostics and possibly extended diagnostics.
B-1
Standard Diagnostics
Slave Diagnostics Byte 1: Station Status 1
Bit
Name
Description
00
Diag.Station_Non_Existent
This bit is set by the Master Unit if the Unit does not respond to any of the request
messages sent by the master. If this bit is set the diagnostic bits contains the
state of the last diagnostic message or the initial value. The slave device sets this
bit to zero in case of a correct response.
01
Diag.Station_Not_Ready
This bit indicates that the Unit is not yet ready for data transfer. This also may be
caused by a SmartSlice Bus failure during start-up.
02
Diag.Cfg_Fault
Set by the Unit, this bit indicates that the last received configuration data from the
Master Unit is rejected. The configuration data in the slave device differ from the
configuration sent by the Master Unit.
03
Diag.Ext_Diag
This bit indicates that the diagnostics message returned by the Unit contains
extended diagnostics, i.e. it contains more than the mandatory 6 bytes.
04
Diag.Not_Supported
In case the Master Unit sent a message to the Unit, which is not supported, this
bit will be set.
05
Diag.Invalid_Slave_Response
This bit is set by the Master Unit if the Unit has returned an invalid response to a
Master request message. The slave device will set this bit to 0.
06
Diag.Prm_Fault
Set by the Unit, this bit indicates that the last received parameter data from the
Master Unit has been rejected. The parameter data in the Unit differ from the
parameter sent by the Master Unit.
07
Diag.Master_Lock
This bit indicates that the Unit has been parameterized by another master. The
bit is set by the Master Unit, if the address in byte 4 differs from 255 and from the
Master Unit’s own address. The Unit sets this bit to zero.
Byte 1
Diag.Master_Lock
Diag.Prm_Fault
Diag.Invalid_Slave_Response
Diag.Not_Supported
Diag.Ext_Diag
Diag.Cfg_Fault
Diag.Station_Not_Ready
Diag.Station_Non_Existent
7
6
5
4
3
2
1
0
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