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Mitsubishi Electric MELSEC-I/OLINK Handbook Page 60

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6
REPLACING THE I/O MODULES
(4) Comparisons between AJ55TB32-8DR and A20SB-04US + A20PB-04RS
Specifications
Number of input points
External input ↔ Internal circuit:
Insulation method
Internal circuit ↔ Transmission circuit:
Input type
Positive/negative common shared type
Rated input voltage
Rated input current
Operating voltage range
(ripple voltage 4Vp-p or less)
Maximum simultaneous on
input point
ON voltage/ON current
14VDC or higher/3.5mA or higher
OFF voltage/OFF current
6VDC or lower/1.7mA or lower
Input resistance
OFF  ON
Response
time
ON  OFF
Common terminal
arrangement
(3-wire type terminal block)
6
- 27
AJ55TB32-8DR
A20SB-04US input specifications
input specifications
4 points
External input ↔ Internal circuit: Not insulated
Photocoupler
Not insulated
24VDC
Approx. 7mA
21.6 to 26.4VDC
100%
Approx. 3.3k
10ms or less
10ms or less
4 points per common
: Compatible,
4 points
Internal circuit ↔ Transmission circuit:
Photocoupler
Negative common type
24VDC
Approx. 7mA
21.6 to 27.6VDC
(ripple voltage 0.5Vp-p or less)
100%
16VDC or higher/4.5mA or higher
6VDC or lower/1mA or lower
Approx. 3.3k
1ms or less
1ms or less
4 points per common
(2-wire type terminal block)
: Partially changed, ×: Not compatible
Compat-
Precautions for
ibility
replacement
The insulated locations are
different.
A positive common type
*1
cannot be used.
Operating voltage range is
different.
ON voltage and ON current
*2
are increased.
OFF current is decreased.
To connect an item such as a
3-wire type sensor, an
external common terminal
block is required.
*2

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