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Mitsubishi Electric MELSEC-I/OLINK Handbook Page 65

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6
REPLACING THE I/O MODULES
(6) Comparisons between AJ55TB32-16DR and A20SB-08USD-1 + A20PB-08RS
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)
Specifications
output specifications
Number of output points
External output ↔ Internal circuit:
Insulation method
Internal circuit ↔ Transmission circuit:
Output type
24VDC 2A (resistance load)/point
Rated load voltage/current
240VAC 2A (COS=1)/point
Minimum switching load
Maximum switching voltage
OFF  ON
Response
time
ON  OFF
Mechanical
Rated switching voltage/current load
200VAC 1.5A, 240VAC 1A
Life
(COS=0.7) 100,000 times or more
Electrical
200VAC 1A, 240VAC 0.5A
(COS=0.35) 100,000 times or more
24VDC 1A, 100VDC 0.1A
(L/R=7ms) 100,000 times or more
Maximum switching
frequency
Surge suppressor
Common terminal
arrangement
(2-wire type terminal block)
*1
For the negative common type, use the A20SB-08UD.
*2
Check the specifications of the sensors or switches to be connected to the A20SB-08USD-1.
AJ55TB32-16DR
A20SB-08USD-1 input specifications
input specifications
8 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
8 points per common
AJ55TB32-16DR
A20PB-08RS output specifications
8 points
External output ↔ Internal circuit: Relay
Photocoupler
Not insulated
Contact output type
8A/common
5VDC 1mA
250VAC 110VDC
10ms or less
12ms or less
20 million times or more
100,000 times or more
3,600 times/hour
None
8 points per common
: Compatible,
8 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/5.5mA or higher
8VDC or lower/2mA 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
Contact output type
30VDC 2A (resistance load)/point
220VAC 2A (COS=1)/point
1A (induced load)/point
0.1VDC 0.1mA
(reference value)
250VAC 110VDC
10ms or less
10ms or less
20 million times or more
100,000 times or more
20 times/minute
None
All points independent
(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 voltage and OFF current
*2
are increased.
Compat-
Precautions for
ibility
replacement
The insulation method is
different.
The rated load current is
different.
Check the specifications of
the load to be used.
Maximum switching frequency
is different.
Because 8 points per common
is changed to all points
independent, the wiring is
different.
6
- 32

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