Siemens Simatic 6ES7 157-0AD81-0 A0 Series - Page 116

Diagnostics Using the User Program
10-22
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
7
Bit no.
654 132
0
DB10.DBB161:
Identifier: H status of the link
DB10.DBB165:
001
00110000
Which status do the two IM 157 modules have?
IM 157 activated
IM 157 involved in data exchange
11111
7
0
Status of the relevant IM 157
DB10.DBB166:
10010000
IM 157 disabled (stand-by mode)
IM 157 involved in data exchange
7
0
Status of the partner IM 157
The SIMATIC H station always reads only the active IM 157. Therefore, changing
the active channel has no effect on the H status.