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Appendix
The first 6 bytes or 3 words - Word D ~ Word D+2 - are mandatory bytes, which will always be sent by the slave
station. 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
Description
00
Diag.Station_Non_Existent
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 station sets
this bit to zero in case of a correct response.
01
Diag.Station_No_Ready
This bit indicates that the slave station is not yet ready for data transfer.
02
Diag.Cfg_Fault
Set by the slave station, this bit indicates that the last received configuration data
from the Master Unit are rejected. The configuration data in the slave station dif-
fer from the configuration sent by the Master Unit.
03
Diag.Ext_Diag
This bit indicates that the diagnostics message returned by the slave station con-
tains 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 slave station, which is not sup-
ported by that station, this bit will be set by the slave station.
D
D + 1
D + 2
D + 3
D + 4
Byte 1
Byte 2
Byte 3
Byte 4
Byte 5
Byte 6
Byte 7
Byte 8
Byte 9
Byte 10
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
Содержание SYSMAC CJ1W-PRM21
Страница 2: ...iv...
Страница 36: ...22 Basic Operating Procedure Section 1 5...
Страница 52: ...38 Defining PROFIBUS DP in the Software Section 2 5...
Страница 112: ...98 Allocated CIO Area Words Section 4 2...
Страница 122: ...108 Command Response Reference Section 5 2...
Страница 160: ...146 Replacing the Unit Section 7 8...
Страница 174: ...160 Appendix...
Страница 180: ...166 I O Data Conversions Appendix D...
Страница 186: ...172 Configurator Error and Warning Messages Appendix E...
Страница 187: ...173 Index...
Страница 188: ...174 Index...
Страница 190: ...176 Revision History...