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User´s Guide Power Rail Booster
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).
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.
Be sure there is sufficient tensile load and observe the cable's minimum
bending radii.
Pin No.
Name
1
L1+
2
L2+
3
M1
4
M2
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.
Be sure there is a sufficient tensile load and observe the cable's minimum
bending radii.
Pin - Nr.
Name
6
11
7
12
8
14
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
Copyright © Siemens AG 2005 All rights reserved.
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Function
24 V DC
24 V DC
Ground
Ground
Function
Shared connector pin
Conducts potential from terminal 11 when SF LED is on (fault)
Conducts potential from terminal 11 when SF LED is out (ready)
6ES7 972-4AA02-0XA0
Version 12/2005
Page 32 of 49
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