Figure 3-11 Possible Redundancy Configurations; Figure 3-12 Applicable Diodes - Siemens Add 7 AddFEM Manual

AddFEM
I/O signal
AI
(Analog–Input)
AO
(Analog–Output)
DI
(Digital–Input and
speed detection)
DO
(Digital–Output)
Legend:

Figure 3-11 Possible redundancy configurations

1.6 V bi–directional,
e.g. 4 x BZX55 COV8
for $20 mA or $30 mA

Figure 3-12 Applicable diodes

AddFEM
C79000–G8076–C900–03
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Configuration variants
+
A
–
+
B
–
A
B
AddFEM
B
A
1.6 V uni–directional,
e.g. 2 x BZX55 COV8
for 0..20 mA or 4..20 mA
Mode of Operation
+
A
–
+
B
–
A
B
Sensor/actuator
3-21