Precautions For I/O Module Replacement - Mitsubishi Electric MELSEC-A0J2H Series Handbook

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I/O MODULES REPLACEMENT

3.3 Precautions for I/O Module Replacement

(1) Wiring
(a) Wire gauge and size of solderless terminals
As the Q series supports compact modules and terminal blocks, the wire gauge and size of the
solderless terminals that can be used on terminal blocks differ from those that can be used on the
A0J2H series.
For this reason, when replacing with the Q series, use wire gauges and solderless terminals that
match the specifications of the Q series I/O modules.
(2) Precautions for input module ( specifications change)
(a) The rated input current
Some Q series input modules support a smaller rated input current than the A0J2H series input
modules do. Confirm the specifications of the sensors or switches to be connected.
(b) The OFF current
Some Q series input modules support an OFF current than the A0J2H series input modules do.
Confirm the specifications of the sensors or switches to be connected.
(c) The maximum number of simultaneous input points
Some Q series input modules have less maximum number of simultaneous input points than the
A0J2H series input modules do. When replacing with the Q series, refer to the derating chart and use
within the range indicated in the derating chart.
(d) The rated voltage value
The QX4 and QX8 model DC input modules of the Q series are dedicated to 24VDC. When using
12VDC, use the QX7.
(e) The response time
On the DC input modules of the Q series, the input response time can be configured using the
parameter.
Use the parameter to configure the input response time according to the response time of the A0J2H
series input module.
(f) Common terminal arrangement
Use caution when using voltages that differ depending on each common as common terminal
arrangement may differ between the A0J2H series and the Q series.
(3) Precautions for output module ( specifications change)
(a) The output current values
Some Q series output modules support a smaller output current than the A0J2H series output
modules do. Before using Q series output modules having a smaller output current, confirm the
specifications on the load side.
(b) Common terminal arrangement
Use caution when using voltages that differ depending on each common as common terminal
arrangement may differ between the A0J2H series and the Q series.
(c) The common maximum load current
The maximum load current per common may differ between A0J2H series and Q series. Check the
maximum load current per common before use.
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