ABB Symphony Harmony Series, Instruction, Page: 162 / 402

Digital Input
WBPEEUI240751C0 4 - 7
- A-to-D converter failure.
- Bad voltage reference.
•
Failed D-to-A converter (one for all channels).
Digital Input
For digital input capable blocks, channels are directly wired in
parallel to both I/O modules (Figs.
4-9 and 4-10 ). A short
Figure 4-4. AIN-200/220 Block - Voltage and Thermocouple Mode
T 0 3 23 4 A
R E F 1
R E F 1
R E F 16
R E F 16
R E F 17
R E F 17
C JC R E F
C JC R E F
1
1
16
16
17
17
C H 1
C H 1
C H 16
C H 16
•
•
•
•
•
•
•
•
•
•
•
•
A IN -2 00/220 M O D U LE
A IN -2 00/220 M O D U LE
R E D U N DA N C Y L IN K
R E D U N DA N C Y L IN K
A M P
A M P
A M P
A M P
A /D
A /D
A /D
A /D
A /D
A /D
O P TO -
C O U P LE R
O P TO -
C O U P LE R
O P TO -
C O U P LE R
O P TO -
C O U P LE R
A
A
A
RTD 1
RTD 2
B
B
B
H N E T
C P U
A N D
H N E T
IN T E R FAC E
C P U
A N D
H N E T
IN T E R FAC E
+ +
+
+
+
+
+ 24 V
R E D U N DA N T
A IN -200/220 B A S E
–
–
–
–
–
–
V IN