On-Board Points; Point Sensor Loops; Single Eol Resistor Circuit Style - Bosch B5512 Reference Manual

Control Panel
12

On-board points

1
The control panel provides eight on-board points . Each point functions independently and
does not interfere with the operation of the others. The control panel monitors the sensor
loops for normal, shorted, or open conditions between an input terminal and any of the point
common terminals.
The programming for the point determines how the control panel responds to those
conditions.
The control panel ignores sensor loops (both on-board and off-board) for 60 seconds after
power up to ensure that any connected devices stabilize.
Caution!
Any points programmed as fire supervisory points are latching. A latching point requires
!
acknowledgment before it can be cleared.
12.1

Point sensor loops

You can configure each sensor loop for a single EOL resistor, or for dual EOL resistors. Single
EOL resistor is the default. For dual EOL resistors, set the Point Index (point profile) > Circuit
Style parameter to dual.
Notice!
You do not need to install the EOL resistor for unused points (Point Index parameter set to 0
[zero]).
UL does not permit normally closed loops for commercial fire applications.
Notice!
Optionally use these points for household fire applications. You can connect four-wire
detectors to these points, for example.
12.1.1

Single EOL resistor circuit style

When wiring on-board points for the single EOL resistor circuit style, install a 1 kΩ resistor at
the far end of the sensor loop to provide a reference for supervision. You can connect dry
contact sensing devices in series (normally closed) or in parallel (normally open) to any of
these loops.
The number of normally open and normally closed detection devices each sensor loop can
supervise is limited only by the resistance on the loop. The total resistance for the wire length
and contacts, excluding the end-of-line (EOL) resistor, must not exceed 100 Ω.
Bosch Security Systems, Inc.
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Installation and System Reference Guide
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On-board points | en 63
2015.07 | 12 | F.01U.287.180