Omron SYSMAC CS Series Operation Manual page 255

Slave Diagnostics Message
The first 6 bytes or 3 words - Word D ~ Word D+2 - are mandatory bytes, which will always be sent by the
slave device. Any additional, i.e. extended diagnostics bytes start at Word D+3. The contents of the first six
bytes is defined by the PROFIBUS standard. The contents of the extended diagnostics information is slave
device dependent, but the format is defined in the PROFIBUS standard.
The first 6 bytes and the Extended diagnostics format are explained below.
B-3 Standard Diagnostics Data Bytes
Slave Diagnostics Byte 1
A layout of Byte 1 is shown below. This byte is mapped to the high-byte of Word D.
Bit Name
00 Diag.Station_Non_Existent
01 Diag.Station_Not_Ready
02 Diag.Cfg_Fault
03 Diag.Ext_Diag
04 Diag.Not_Supported
234
D
D + 1
D + 2
D + 3
D + 4
7 6 5 4 3 2 1 0
Byte 1
This bit is set by the Master Unit if the slave 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.
This bit indicates that the slave device is not yet ready for data transfer.
Set by the slave device, this bit indicates that the last received configuration data
from the Master Unit are rejected. The configuration data in the slave device dif-
fer from the configuration sent by the Master Unit.
This bit indicates that the diagnostics message returned by the slave device con-
tains extended diagnostics, i.e. it contains more than the mandatory 6 bytes.
In case the Master Unit sent a message to the slave device, which is not sup-
ported by that device, this bit will be set by the slave device.
Byte 1 Byte 2
Byte 3 Byte 4
Byte 5 Byte 6
Byte 7 Byte 8
Byte 9 Byte 10
Diag.Station_Non_Existent
Diag.Station_Not_Ready
Diag.Cfg_Fault
Diag.Ext_Diag
Diag.Not_Supported
Diag.Invalid_Slave_Response
Diag.Prm_Fault
Diag.Master_Lock
Description
Appendix B