User´s Guide Power Rail Booster Version 12/2005
Copyright © Siemens AG 2005 All rights reserved. 6ES7 972-4AA02-0XA0 Page 32 of 49
Æ Supply the PRB only with safety extra-Iow voltage to IEC 60634-4-41
"Generation as Functional Extra-Iow Voltage with Safe Electrical lsolation", DC
20, 4-28.8 V DC (+24 V typical).
Æ The PRB must be operated with a grounded incoming supply. The reference
potential (ground) of the 24 V DC supply voltage must be connected to PE.
Æ Be sure there is sufficient tensile load and observe the cable's minimum
bending radii.
Pin No.
Name Function
1 L1+ 24 V DC
2 L2+ 24 V DC
3 M1 Ground
4 M2 Ground
Fig. 23: Terminal assignment for the supply voltage interface
6.3.2.6 Connecting the signalling contacts
An electronic semi-conductor relay with potential-free contacts is provided for
signalling faults or the failure of the operating voltage. The signalling contact can be
connected to a controller's digital I/0 via the 15-pin terminal block on the front of the
PRB.
Æ Be sure there is a sufficient tensile load and observe the cable's minimum
bending radii.
Pin - Nr. Name Function
6 11 Shared connector pin
7 12 Conducts potential from terminal 11 when SF LED is on (fault)
8 14 Conducts potential from terminal 11 when SF LED is out (ready)
Fig. 24: Terminal assignment for the signalling contact interface
When the PRB is deenergized, terminals 12 and 14 are separated from terminal
6.3.2.7 Connection scheme for wiring PRB
Fig. 25: Connection scheme PRB
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