Siemens Simatic 6ES7 157-0AD81-0 A0 Series Manual page 24

Description of Components
2.3 IM 157
As an interface module, the IM 157 is intended for the following applications:
S Operation in the DP/PA link on a non-redundant DP master system or on an
S7-400H
S Operation in the Y link on an S7-400H
Features
S All transmission rates from 9.6 kBaud to 12 MBaud for the higher-level DP
master system
S Diagnosis by means of LEDs and the user program
S Bumpless switchover of active channel when in redundancy mode on the
S7-400H
S Support of system changes during operation both in the S7 standard mode and
in the redundancy mode.
S Can be operated as a DPV0 or DPV1 slave depending on the higher level DP
master.
2-4
DP/PA Link and Y Link Bus Couplings
A5E00193841-01 1