Structure and function
Function
3
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Building Technologies
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Fire Safety
11-22
3.3.2 Inputs
3.3.2.1 Configuration options
The inputs can be used to monitor the status, e.g. whether a 'door is closed'. Each
input can be configured as follows:
Status input or danger input
Lead monitoring for 'Open line' or 'Open line and short circuit'
The input is active when the contact is open (normally closed, NC)
The input is active when the contact is closed (normally open, NO)
Filter time (0...240 s)
Status inputs and danger inputs
Danger inputs trigger an alarm as soon as the input is activated.
Status inputs trigger a status change as soon as they are activated.
Line monitoring and circuitry
The input lines are monitored for 'Open line' or 'Open line and short circuit'. To
facilitate this, resistors must be connected to the lines of the inputs. When a short
circuit of an open line occurs on one of the input lines, a fault message is
transmitted to the control unit.
The inputs must be potential-free.
Filter time
The statuses of the inputs are polled several times a second.
The following conditions must be satisfied to detect a change in status:
The status change must be present during activation for at least as long as the
filter time
The status change must be present during deactivation for at least as long as
the filter time but for no more than 5 seconds
The filter time can be used for the suppression of disturbing pulses. Status
changes and faults are indicated by the LEDs on the module and are transmitted to
the control unit.
