MP500/4N-8-16 Installation
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5.12.5 Connecting inputs
The type of inputs is determined by the way in which the detectors are connected. Instead, their specialization is defined with the
programming.
The type for each individual input is specified during programming. It is therefore possible to create a system that includes different
types of inputs.
Based on the type of connection, the inputs are divided into:
Double balanced
: when in stand-by, the electrical circuit connected to the input must be closed with 2 - 15 kohm resistors,
tolerance 1%. Connection in conformity with EN50131.
NC
(normally closed): when in stand-by the electrical circuit connected to the input must be closed towards
the positive.
Single balanced
: when in stand-by, the electrical circuit connected to the input must be closed toward the
positive with a 15 kohm resistor tolerance 1%.
NO
(normally open): when in stand-by, the electrical circuit connected to the input must be open (it closes
towards positive when in a state of alarm).
Shock / Roller
: this type of input is used to connect the sensors that generate quick signals (shock, roller,
seismic ...). In this case connection method is necessarily type NC.
IMPORTANT!
Each sensor must be powered by the device that controls it (control panel, expansion, keypad, or reader). The
balancing resistors must be connected to the positive of the power supply of the same device. Connections with different
power supplies may cause false alarms.
