Description of Components
2-4
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
2.3 IM 157
As an interface module, the IM 157 is intended for the following applications:
Operation in the DP/PA link on a non-redundant DP master system or on an
S7-400H
Operation in the Y link on an S7-400H
Features
All transmission rates from 9.6 kBaud to 12 MBaud for the higher-level DP
master system
Diagnosis by means of LEDs and the user program
Bumpless switchover of active channel when in redundancy mode on the
S7-400H
Support of system changes during operation both in the S7 standard mode and
in the redundancy mode.
Can be operated as a DPV0 or DPV1 slave depending on the higher level DP
master.
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