ABB Symphony Harmony Series - AIN-200;220 Block - Voltage and Thermocouple Mode; Digital Input

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
T03234A
REF1
REF1
REF16
REF16
REF17
REF17
CJC REF
CJC REF
1
1
16
16
17
17
CH 1
CH 1
CH 16
CH 16
•
•
•
•
•
•
•
•
•
•
•
•
AIN-200/220 MODULE
AIN-200/220 MODULE
REDUNDANCY LINK
REDUNDANCY LINK
AMP
AMP
AMP
AMP
A/D
A/D
A/D
A/D
A/D
A/D
OPTO-
COUPLER
OPTO-
COUPLER
OPTO-
COUPLER
OPTO-
COUPLER
A
A
A
RTD 1
RTD 2
B
B
B
HNET
CPU
AND
HNET
IN T E R FACE
CPU
AND
HNET
IN T E R FACE
+
+
+
+
+
+
+24 V
REDUNDANT
AIN-200/220 BASE
–
–
–
–
–
–
V
IN