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Mitsubishi Electric MELSEC-I/OLINK Handbook Page 44

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6
REPLACING THE I/O MODULES
(6) Comparisons between AJ55TB3-16D and A20SB-16USD
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
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)
Operation indicator
40-point terminal block (M3 screw)
External wiring method
Transmission circuit included
Applicable wire size
Applicable crimping
terminal
Voltage
I/O module
power
supply
Current
External dimensions
50(H) × 177(W) × 66(D) mm
Installation method
Weight
*1
For the positive common type, use A20SB-16UD.
*2
Check the specifications of the sensors or switches to be connected to the A20SB-16USD.
6
- 11
AJ55TB3-16D
16 points
External input ↔ Internal circuit: Not insulated
Photocoupler
Internal circuit ↔ Transmission circuit:
Not insulated
24VDC
Approx. 7mA
19.2 to 26.4VDC
(ripple ratio within 5%)
100%
Approx. 3.3k
10ms or less
10ms or less
8 points per common
ON indication (LED)
2
(when the following applicable crimping
0.75 to 2mm
1.25-3, 1.25-YS3A,
2-S3, 2-YS3A
V1.25-3, V1.25-YS3A,
V2-S3, V2-YS3A
15.6 to 27.6VDC
60mA
Screw mounted
Mounted to DIN rail
0.4kg
: Compatible,
A20SB-16USD
16 points
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
16 points per common
(3-wire type terminal block)
ON indication (LED)
40-point terminal block (M3 screw)
Transmission circuit included
2
0.3 to 1.25mm
2
terminals are used: 0.75 to 2mm
)
2
For wire sizes 0.75 to 2mm
R2-3SL, RAV2-3SL, RAP2-3SL,
VD2-3S, VD2-3.5SS, VD2-3.5S,
VDAV2-3.5SS, VDAV2-3.5S
21.6 to 27.6VDC
(ripple voltage 0.5Vp-p or less)
233mA
40(H) × 190(W) × 60(D) mm
Screw mounted
Mounted to DIN rail
0.24kg
: 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.
The A20SB-16USD changes
from 2 commons to 1
common.
Wiring must be changed.
Existing wires can be used but
applicable crimping terminals
are different.
For details, refer to Section
6.3.
Operating voltage range is
different.
Because the current
consumption has increased,
the current capacity must be
reviewed.
The shape is different.
Because mounting hole size is
×
different, reworking is
required.
The A20SB-16USD can be
mounted to the existing DIN
rail.
*2

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