Structure Of The H Status Of The Im 157 In Redundant Operation On The S7-400H - Siemens Simatic 6ES7 157-0AD81-0 A0 Series Manual

10.2.5 H status
The IM 157 delivers the H status only if it is connected to the redundant DP master
system of an S7-400H. The H status reports on the status of the active and
passive IM 157. The H status consists of 8 bytes.
Structure of the H status
Byte 160
Byte 161
Byte 162
Byte 163
Byte 164
Byte 165
Byte 166
Byte 167
Figure 10-7
DP/PA Link and Y Link Bus Couplings
A5E00193841-01 1
7 6 5 4 3 2 1 0 Bit no.
0 0 0 0 1 0 0 0
Length of the diagnostic blockincluding byte 160 (= 8 bytes)
Code for station diagnosis
7 6 5 4 3 2 1 0 Bit no.
1 0 0 1 1 1 1
1EH: Parameter assignment status (switchover by DP master)
1F : H status of activated IM 157
H
Code for status message
0 Always "0"
Not applicable
Not applicable
7 6 5 4 3 2 1 0 Bit no.
0 0 0 0 H status 1: status of the IM 157
1: deactivated
1: activated
1: IM 157 is engaged in data exchange with the underlying slaves
1: Master status: clear
7 6 5 4 3 2 1 0 Bit no.
0 0 0 0 H status 2: status of the partner IM 157
1: deactivated
1: activated
1: IM 157 is engaged in data exchange with the underlying slaves
1: master status: clear
0 H status 3: always "0"

Structure of the H status of the IM 157 in redundant operation on the S7-400H

Diagnostics Using the User Program
10-13