P/N 315-093312-7
P7
P5
P3
P1
P2
P4
P6
P8
PLC-4 MODULE BOARD
Circuit 1
Edge connector
Edge connector
Circuit 2
Circuit 3
Circuit 4
CB1
P1
P2
PL864-25A/70A
CB1
P1
K1
P2
PL864-25S
Figure 2
PL864 Plug-on Boards
Figure 1
PLC-4 Module Board
Installation Instructions
Model PLC-4
Power Limiting Module
INTRODUCTION
Refer to the
MME-3 or MLE-6 Power Limited
Wiring Instructions,
P/N 315-094883 or P/N 315-
094970, as applicable, for further information.
The Model PLC-4 from Siemens Industry, Inc.,
(See Figure 1) and its associated PL864 plug-on
boards (See Figure 2) limit the power of the
MXLV system to comply with UL-864. There are
three different PL864 boards that can plug onto
the four slots of the PLC-4:
• the PL864-25A
• the PL864-70A
• the PL864-25S
The PL864-25A and the PL864-70A plug onto
the PLC-4 to limit power to audio circuits. The
PL864-25S plugs onto the PLC-4 to limit power
to strobe circuits.
NOTE:
Use the PL-864S for strobe circuits
only. Using the PL-864S for audio
circuits may damage the system.
Use the PL864-70A for 70.7V audio
circuits only.
The PLC-4 plugs onto one of the OMM card
edge connectors. A single PLC-4 with four
PL864 plug-on boards can serve up to four
audio and/or strobe circuits.
The PLC-4 and PL864-25A/70A audio cards do
not supervise themselves. However, since all
audio power to the MXLV system passes
through them, signal losses appear as troubles
for the ASC-1/2 modules.
Siemens Industry, Inc.
Building Technologies Division
Florham Park, NJ
Siemens Building Technologies, Ltd.
Fire Safety & Security Products
2 Kenview Boulevard
Brampton, Ontario
L6T 5E4 Canada
