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Mitsubishi Electric MELSEC-I/OLINK Handbook Page 49

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6
REPLACING THE I/O MODULES
(5) Comparisons between AJ55TB2-8T and A20PB-08U
Specifications
Number of output points
External output ↔ Internal circuit:
Insulation method
Internal circuit ↔ Transmission circuit:
Output type
Rated load voltage
Operating load voltage
range
Maximum load voltage
Maximum inrush current
Leakage current at OFF
Maximum voltage drop at
0.9VDC or lower (TYP.) 0.5A
ON
1.5VDC or lower (MAX.) 0.5A
OFF  ON
Response
time
ON  OFF
2ms or less (resistance load)
Surge suppressor
Common terminal
arrangement
(2-wire type terminal block)
Operation indicator
24-point terminal block (M3 screw)
External wiring method
Transmission circuit included
Applicable wire size
Applicable crimping
terminal
Voltage
External
power
Current
supply
(24VDC TYP. per 1 common)
Voltage
I/O module
power
supply
Current
External dimensions
50(H) × 114(W) × 66(D) mm
Installation method
Weight
*1
When used on 12VDC, consider the use of an external relay.
AJ55TB2-8T
8 points
External output ↔ Internal circuit: Not insulated
Photocoupler
Not insulated
Sink type
12/24VDC
10.2 to 30VDC
(peak voltage 30VDC)
0.5A/point
4A/common
4A, 10ms or less
0.1mA or lower
2ms or less
Zener diode
8 points per common
ON indication (LED)
2
0.75 to 2mm
1.25-3, 1.25-YS3A,
2-S3, 2-YS3A
V1.25-3, V1.25-YS3A,
V2-S3, V2-YS3A
10.2 to 30VDC
30mA
15.6 to 27.6VDC
(peak voltage 27.6VDC)
55mA
Screw mounted
Mounted to DIN rail
0.3kg
: Compatible,
A20PB-08U
8 points
Internal circuit ↔ Transmission circuit:
Photocoupler
Sink type
24VDC
21.6 to 27.6VDC
(ripple voltage 0.5Vp-p or less)
0.2A/point
1.6A/common
500mA or lower
0.1mA or lower
1V or lower
1ms or less
1ms or less
None
8 points per common
(2-wire type terminal block)
ON indication (LED)
20-point terminal block (M3 screw)
Transmission circuit included
2
0.3 to 1.25mm
(when the following applicable crimping
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)
21mA
40(H) × 100(W) × 60(D) mm
Screw mounted
Mounted to DIN rail
0.13g
: Partially changed, ×: Not compatible
Compat-
Precautions for
ibility
replacement
The insulated locations are
different.
*1
12VDC cannot be used.
Operating voltage range is
different.
The maximum load current
per point has decreased.
Check the specifications of
the load to be used.
Inrush current has decreased.
Check the specifications of
the load to be used.
Check the specifications of
the load to be used.
The surge suppressor is not
×
built-in.
Wiring must be changed.
Existing wires can be used but
applicable crimping terminals
are different.
For details, refer to Section
6.3.
External power supply for the
A20PB-08U is unnecessary.
Operating voltage range is
different.
Because the external power
supply and the I/O module
power supply are shared, the
consumed current is
decreased.
The shape is different.
Because mounting hole size is
×
different, reworking is
required.
The A20PB-08U can be
mounted to the existing DIN
rail.
6
- 16

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