Selco M2500 - Normally Open Sensor Connection (With Monitoring)

SELCO A/S M2500 Installation Manual
Revision: 23-04-2012 Page 14
4.4.2 Connection of a normally closed sensor without cable monitoring
The following example shows the Connection of a normally closed sensor without cable
monitoring.
The sensor is considered active when open,
inactive when connected to COM.
When activated, the input generates an
alarm or shutdowns or a control signal,
depending on the configuration.
4.4.3 Connection of a normally open sensor with cable monitoring
The following example shows the Connection of a normally open sensor with cable monitoring.
The sensor is considered
active when connected to
COM, inactive when open.
Resistor R1 is used for
cable break monitoring.
Resistor R2 is used for short
circuit monitoring.
It is very important that
both resistors are mounted
close to the sensor.