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97
Specifications and Part Names
Section 6-2
Line Disconnection Detection (Analog Inputs)
If the input signal drops to below 0.8 V or 3.2 mA, respectively, when the input
range is set to either 1 to 5 V or 4 to 20 mA, a disconnection of the input line is
detected and the line disconnection detection function is activated. When a
line disconnection is detected, the conversion data will be 8,000. The time for
the line disconnection to be detected, and the time required to clear the error,
is the same as the conversion time. When the input returns to a value within
the range that can be converted, the line disconnection status is automatically
cleared, and normal conversion data is resumed.
6-2
Specifications and Part Names
I/O Specifications
The general specifications for the Analog I/O Board conform to those of the
CPM2B CPU Unit.
Item
Voltage input/output
Current input/output
Analog
inputs
Input signal range
0 to 5 V, 1 to 5 V, 0 to 10 V, or
−
10 to 10 V
0 to 20 mA or 4 to 20 mA
Maximum rated input
15 V
±
30 mA
External input impedance
1 M
Ω
min.
Approx. 250
Ω
Resolution
6,000 (full scale)
Overall
accuracy
25
°
C
±
0.3% (full scale)
±
0.4% (full scale)
0 to 55
°
C
±
0.6% (full scale)
±
0.8% (full scale)
A/D conversion data
Binary data (4-digit hexadecimal)
−
10 to 10 V: Full scale F448 to 0BB8 (hex)
Other ranges: Full scale 0000 to 1770 (hex)
Average processing
Yes (Set each input using DIP switch 2.)
Disconnection detection
Yes
Analog
outputs
Output signal range
1 to 5 V, 0 to 10 V, or
−
10 to 10 V
0 to 20 mA or 4 to 20 mA
External output allowable load
resistance
1 k
Ω
min.
600
Ω
max.
External output impedance
0.5
Ω
max.
---
Resolution
6,000 (full scale)
Overall accu-
racy
25
°
C
±
0.4% (full scale)
0 to 55
°
C
±
0.8% (full scale)
D/A conversion data
Binary data (4-digit hexadecimal)
−
10 to 10 V: Full scale F448 to 0BB8 (hex)
Other ranges: Full scale 0000 to 1770 (hex)
Conversion time
2 ms/point (10 ms for all points)
Isolation method
Between analog I/O and internal circuits: Photocoupler isolation
(No isolation between analog inputs.)
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