Structure Of The Module Diagnosis - Siemens Simatic 6ES7 157-0AD81-0 A0 Series Manual

Structure of the module diagnosis

The module diagnosis comprises 31 bytes.
Each slave slot occupies one bit. The slaves are arranged in ascending order by
their PROFIBUS addresses.
A bit is set if:
S the corresponding slave for the respective slot delivers a module diagnosis, or
S the corresponding configured slave is not engaged in data exchange with the
DP master.
Byte 6
Byte 7
Byte 8
.
.
Byte 34
Byte 35
Byte 36
Figure 10-3
DP/PA Link and Y Link Bus Couplings
A5E00193841-01 1
7 6 5 4 3 2 1 0
0 1 0 1 1 1 1 1
Length of the diagnostic blockincluding byte 6
(= 31 bytes)
Code for module diagnosis
7 6 5 4
8 7 6 5
16 15 14 13 12
.
.
224 223 222 221 220 219 218 217
232 231 230 229 228 227 226 225
236 235 234 233
The set bit indicates that a slave either reported a diagnosis for the
respective slot or failed.
Structure of the module diagnosis
Diagnostics Using the User Program
Bit no.
3 2 1 0 Bit no.
4 3 2 1 Slots 1 to 8
11 10 9 Slots 9 to 16
. .
. .
Slots 217 to 224
Slots 225 to 232
Slots 233 to 236
10-7