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Structure and function
Input/output configuration options (secondary side)
3
41 | 72
Building Technologies
009122_h_en_--
Fire Safety
2016-05-04
3.4.4.2 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.
Circuit featuring identical-polarity monitoring
Figure 10: Circuit for control lines with identical-polarity monitoring
1 Internal fuse (0.7 AT)
2 External fuse on the output (1 AT or 1.5 AT)
The maximum monitoring voltage is 4 V. Use reverse-polarity monitoring if the
load to be monitored responds at 4 V.
Calibration of load resistances
To ensure that any load resistances (particularly those associated with coils) can
be monitored without any problems, the connected line must be calibrated during
commissioning. During calibration, the load resistance and the line resistance are
measured and stored as reference values.
The calibration process is initiated by pressing the push button on the input/output
module. Once calibration has been successfully completed, the input/output
module adopts the operating mode. This is indicated by the input/output LEDs. The
LEDs also indicate if the calibration process has failed.
With identical-polarity inverse control, the calibration process can only be
performed if the relays have dropped out. Therefore, control must be activated
following configuration so that the relay will drop out.
See also
Calibrating the control line [ 57]
Control without confirmation [ 43]
Control with confirmation [ 44]
Printed circuit board view [ 21]
Adjustment elements [ 27]
24 V
0 V
0 V
4 V
I/O
FDCIO223
+
1
2
R = 30...3,3 k
L