Siemens FDCIO223 Technical Manual page 36

Structure and function
36
Building Technologies
Fire Safety
Monitoring
You have the option of monitoring the control line. Monitored control lines are
monitored for the following criteria:
Open line (creeping)

Short circuit (creeping)

Ground fault (only both inputs/outputs jointly, no line-specific fault message)

Notes:
The control line is not monitored in the triggered state.

To avoid false alarms, transfer to the control panel can be delayed by means of

a setting. In theory, a delay time of between 0.5 and 240 seconds can be set.
However, in practice the actual setting range will depend on the control panel.
Monitoring can be configured in accordance with the following types:
Identical-polarity monitoring

Reverse-polarity monitoring

The monitoring voltage is set by means of jumpers.
Identical-polarity monitoring
With this type of monitoring, the connected load's internal resistance is monitored.
As a result, no monitoring resistors need to be installed. Calibration is only possible
with the push button.
Reverse-polarity monitoring
With this type of monitoring, the control voltage polarity is reversed in relation to
that of the monitoring voltage. The monitoring resistor is parallel with the load. The
load must be isolated from the monitoring voltage by means of a diode. The
monitoring resistor is 3.3 kΩ.
Reverse-polarity monitoring must always be used in the case of electronic loads.
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2015-10-06