ABB Symphony Harmony Series - Analog Output

4 - 4 WBPEEUI240751C0
Analog Output
• A-to-D converter failure (one per channel).
• Opto-coupler failure.
• Bad voltage reference.
• Channel failure or out of range.
Analog Output
The AOT-150 block has special circuitry that switches the
channels between the primary I/O module and the backup I/O
Figure 4-1. AIN-120 Block - Voltage Mode (Differential or Single -Ended)
T03231A
+
+
+
+
+
+
+24 V
REF1
REF1
REF2
REF2
CH 1
CH 1
•
•
•
•
•
•
CH 16
CH 16
MUX
MUX
REDUNDANT
AIN-120 BASE AIN-120 MODULE
AIN-120 MODULE
REDUNDANCY LINK
REDUNDANCY LINK
–
–
–
–
–
–
IF C
V
IN
AMP
AMP
A/D
A/D
A
A
A
B
B
B
HNET
CPU
AND
HNET
IN T ER FAC E
CPU
AND
HNET
IN T ER FAC E