Mitsubishi Electric MELSEC-Q Series - Comparison of I;O Combined Module Specifications

3 REPLACEMENT OF I/O MODULE
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3.2.3 Comparison of I/O combined module specifications
(1) Specifications comparison between A1SH42 and QH42P
: Compatible, : Partially changed, : Incompatible
Specifications A1SH42 QH42P
Compat-
ibility
Precautions for replacement
Input specifications
Number of input points 32 points 32 points 
Isolation method Photocoupler Photocoupler 
Input format Sink type
Sink type
(positive common)

Rated input voltage 12/24VDC 24VDC 12VDC is not applicable.
Operating voltage range
10.2 to 26.4VDC
(ripple ratio within 5%)
20.4 to 28.8VDC
(ripple ratio within 5%)
12VDC is not applicable.
Rated input current
Approx. 2mA (12VDC)
Approx. 5mA (24VDC)
Approx. 4mA
The rated input current is
reduced.
*1
Maximum number of
simultaneous input
points
60% (20 points/common)
Simultaneously on (24VDC)
Refer to the derating chart.
*2

On voltage/on current 8VDC or more/2mA or more 19VDC or more/3mA or more
12VDC is not applicable.
*1
Off voltage/off current 4VDC or less/0.6mA or less 11VDC or less/1.7mA or less
12VDC is not applicable.
*1
Input resistance Approx. 5k Approx. 5.6k
The input resistance is
increased.
*1
Response
time
Off  on 10ms or less (24VDC)
1ms/5ms/10ms/20ms/70ms or less
(Configure the setting in the PLC
parameter dialog box.)
10ms is set by default.

Set the input response time of
parameter to the default value
(10ms).
On  off 10ms or less (24VDC)
1ms/5ms/10ms/20ms/70ms or less
(Configure the setting in the PLC
parameter dialog box.)
10ms is set by default.

Common terminal
arrangement
32 points/common
(common terminal: 1B1, 1B2)
32 points/common
(common terminal: 1B01, 1B02)

Output specifications
Number of output points 32 points 32 points 
Isolation method Photocoupler Photocoupler 
Output format Sink type Sink type 
Rated load voltage 12/24VDC 12-24VDC 
Operating load voltage
range
10.2 to 30VDC
(peak voltage 30VDC)
10.2 to 28.8VDC
(ripple ratio within 5%)
Voltage exceeding 28.8VDC is
not applicable.
Maximum load current 0.1A/point, 1.6A/common 0.1A/point, 2A/common 
Maximum inrush current 0.4A 10ms or less 0.7A 10ms or less 
Leakage current at off 0.1mA or less 0.1mA or less 
Maximum voltage drop
at on
1.0VDC (typ.) 0.1A
2.5VDC (MAX.) 0.1A
0.1VDC (typ.) 0.1A
0.2VDC (MAX.) 0.1A

Response
time
Off  on 2ms or less 1ms or less 
On  off
2ms or less
(resistance load)
1ms or less
(rated load, resistance load)

Surge suppressor Zener diode Zener diode 
Fuse rating
(breaking capacity)
3.2A
(1 fuse/common)
Cannot be changed.
(breaking capacity: 50A)
--
These specifications are
changed to the protection
function.
Fuse blown indication
Available
(LED turns on when a fuse is blown
and a signal is output to the CPU
module.)