Mitsubishi Electric MELSEC-I/OLINK Handbook page 69

6
REPLACING THE I/O MODULES
(8) Comparisons between AJ55TB32-8DT and A20XB-16UD
Specifications
Number of input points
External input ↔ Internal circuit:
Insulation method
Internal circuit ↔ Transmission circuit:
Input 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)
Specifications
output 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 current
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)
Voltage
External
power supply
Current
(24VDC TYP. per common)
Surge suppressor
Common terminal
arrangement (2-wire type terminal block)
*1 Check the specifications of the sensors or switches to be connected to the A20XB-16UD.
AJ55TB32-8DT
A20XB-16UD input specifications
input specifications
4 points
External input ↔ Internal circuit: Not insulated
Photocoupler
Not insulated
Positive common type
24VDC
Approx. 7mA
19.2 to 26.4VDC
(ripple ratio within 5%)
100%
Approx. 3.3k
10ms or less
10ms or less
4 points per common
AJ55TB32-8DT
A20XB-16UD output specifications
4 points
External output ↔ Internal circuit: Not insulated
Photocoupler
Not insulated
Sink type
24VDC
19.2 to 26.4VDC
(peak voltage 26.4VDC)
0.5A/point
2A/common
4A, 10ms or less
0.1mA or lower
2ms or less
19.2 to 26.4VDC
30mA
Zener diode
4 points per common
: Compatible,
8 points
Internal circuit ↔ Transmission circuit:
Photocoupler
Positive common type
24VDC
Approx. 7mA
21.6 to 27.6VDC
(ripple voltage 0.5Vp-p or less)
100%
16VDC or higher/5mA or higher
8VDC or lower/1.5mA or lower
Approx. 3.3k
1ms or less
1ms or less
8 points per common
(3-wire type terminal block)
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)
: Partially changed, ×: Not compatible
Compat- Precautions for
ibility replacement
The insulated locations are
different.
Operating voltage range is
different.
ON voltage and ON current
*1
are increased.
OFF voltage is increased and
OFF current is decreased.
Compati- Precautions for
bility replacement
The insulated locations are
different.
Operating voltage range is
different.
The maximum load current per
point has decreased. Check
the specifications of the load to
be used.
Inrush current is decreased.
Check the specifications of the
load to be used.
Check the specifications of the
load to be used.
– The A20XB-16UD external
power supply and the I/O
module power supply are
–
shared.
The surge suppressor is not
×
built-in.
6
*1
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