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Installing and Connecting the Basic System
How to Connect Check DQs
Connect the 24 V DC load voltage for the check DQs
(L+ potential to terminal 11 and L- potential to terminal 20)
The load voltage source must also supply the failsafe DIs.
Connect the sensor lines which are to be monitored for conductor-to-conductor short circuit to
different check DQs.
Monitoring the Connection of Failsafe Onboard DI with Single-Channel, Failsafe Sensor via
Check DQ (Type D)
L+
L+
24 V DC
-
L
Figure 4-10. Connection of a Check DQ for Short-Circuit Test for Single-Channel, Failsafe
4-12
Subunit A
OUT
IN
L+
1
1
2
2
3
3
4
4
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
DQ 33.1
14
14
15
15
16
16
17
17
18
18
19
19
20
20
-
-
L
L
OUT
DI 32.2
Single-channel, failsafe sensor
Connection to further sensors
Sensor
Subunit B
IN
L+
1
1
2
2
3
3
4
4
DI 32.2
5
5
6
6
7
7
8
8
9
9
10
10
11
11
12
12
13
13
14
14
15
15
16
16
17
17
18
18
19
19
20
20
-
L
EWA 4NEB 812 6210-02
S5-95F
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