Installation
3-11
DP/PA Link and Y Link Bus Couplings
A5E00193841-011
Removing and inserting modules
The modules can be inserted and removed during operation in redundancy mode
on the S7-400H. The following special characteristics should be noted:
The insertion and removal of an IM 157 is only permissible if it is deenergized.
Switch off the 24V DC power supply of the IM 157 to deenergize it. To prevent
failure of the underlying master system, the Y link should be configured with
power supplies for the two IM 157 that can be switched independently of each
other (e. g. by using two power supply modules).
The Y coupler can be inserted/removed without restrictions. However, this will
cause the connected nodes to fail.
Removing bus modules and modules
To remove the Y link, proceed as above but in reverse order.
If the device is already in operation, switch off the 24V DC power supply prior to
removal.
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