Electrical Connection; Operation; 8�1 Switching State Of The Outputs; 8�1�1 The Safe State - Reer PI M18 F Notice D'utilisation

7 Electrical connection

► Disconnect power� Also disconnect any independently supplied relay load
circuits�
► Supply voltage: connect L+ to pin 1 and L- to pin 3 of the connector�
The nominal voltage is 24 V DC� This voltage may vary between 19�2 V and
30 V incl� 5 % residual ripple to EN 61131-2�
In case of a single fault the supply voltage must not exceed a maximum
of 40 V DC� (This requires the safe separation between power supply and
transformer�)
1: safety-related logic unit *
* When there is no current flow on the output stage, back feeding > 3�5 V will lead
to malfunction�

8 Operation

8.1 Switching state of the outputs
8.1.1 The safe state
The safe state is when at least one of the outputs A1 or A2 (OSSDs) is switched
off (zero-current state: logic "0")�
If one of the outputs A1 or A2 is switched off, the subsequent safety-related logic
unit must bring the complete system into the state defined as safe�
8.1.2 The switched state
If the damping element is in the enable zone and if there is no sensor error, both
outputs A1 and A2 (OSSDs) are enabled (logic "1")�
8.1.3 Output characteristics
The output characteristics are compatible with the input characteristics to
EN 61131-2 type 1 or 2:
8
L +
1
+24 V
2 A1
IN1
1
3
L
GND
4 A2
IN2