8
Electrical installation
Safe digital inputs (F-DI.)
Manual – MOVISAFE
®
CS..A Safety Card
46
The processing of the safe digital inputs takes place in dual-channel mode inside the
MOVISAFE
®
CS..A safety card. The safe digital inputs are therefore suitable for ap-
plications up to SIL 3 pursuant to IEC 61508 and Performance Level e pursuant to
EN ISO 13849-1. The external sensors to be connected and their wiring must be in
compliance with the required safety class.
•
Sensors that either switch the sensor supply F-SSx with active pulsed voltage sup-
ply through to a safe digital input (F-DIx) or block it. The time behavior of the
pulsed voltage supply must not be influenced by the sensor.
•
Electronic sensors or evaluation devices that automatically generate test pulses
(switch-on or switch-off pulses) on the input signals, the duration of which is
< 1 ms.
•
Any signal sources that generate a DC input signal within the scope of the specifi-
cation of F-DIx.
Note the wiring diagrams below. The range of connection variants might be limited de-
pending on the sensor type. Note in addition the chapter "Requirements for external
sensors and actuators" as well as the general installation regulations.
Possible contact bounce and interference can be filtered out by a parameterizable in-
put filter. Contact bounces and interferences that are shorter than the set filter time are
removed from the signal.
Unassigned inputs need not be wired. An open input is always read as a "0" signal.
The safe state of the safe digital inputs is the output of "logical 0" on the associated
process values.
The MOVISAFE® CS..A safety card evaluates the digital inputs as follows.
Connection type: Single-channel
:
Logic level input terminal F-DI.
Process value F-DI.
0
0
1
1
Connection type: Dual-channel equivalent:
Logic level input terminal F-
DI.
Logic level input terminal
F-DI. + 1
Process value
F-DI.
0
0
0
0
1
0
1
0
0
1
1
1
Connection type: Dual-channel non-equivalent:
Logic level input terminal
F-DI.
Logic level input terminal
F-DI. + 1
Process value
F-DI.
0
0
0
0
1
0
1
0
1
1
1
0
With paired evaluation, 2 safe digital inputs F-DI. are combined into one input pair,
which has an effect on a common process value.
24842532/EN – 04/2018
