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MELSEC-Q
1 GENERAL SPECIFICATIONS AND PRECAUTIONS FOR USE
(3) Precautions for using the DC input module
(a) Measure against back EMF
When an inductive load is connected, connect a diode to the load in parallel.
Use a diode that meets the following conditions.
• Reverse breakdown voltage is 10 times as high as the circuit voltage or
more.
• Forward current is twice as high as the load current or more.
(4) Precautions for using the high-speed input module
Read the following precautions carefully when using the high-speed input modules
(QX40H, QX70H, QX80H, and QX90H).
(a) When switching to the high-speed input, the specifications of the high-speed
input modules and the input module QX40-S1 are identical. On the other
hand, when switching to the interrupt input, the specifications of the high-
speed input modules and the interrupt module QI60 are identical too.
Therefore, the specifications of the input module (QX40-S1) are construed as
the specifications of the high-speed input module switched to the high-speed
input. Similarly, the specifications of the interrupt module (QI60) indicated in
the manuals other than this manual are construed as the specifications of the
high-speed input module switched to the interrupt input.
(b) By using setting switches on the bottom of the module (refer to Chapter 10),
the high-speed input module switches module types (high-speed input or
interrupt input) for 16 input points all together and between valid and invalid
noise filters as shown below.
Noise filter
selector switch
(Switch 1)
Function
selector switch
(Switch 2)
GX Developer setting
Module type
Interrupt
operation
Input response time
ON
ON High-speed input
*1
OFF Interrupt
*1
OFF
ON High-speed input
*1
*2
OFF Interrupt
*1
: Settable : Not settable
*1: When selecting an improper module type, an error (error code: 2100)
occurs.
*2: The input response time value set in GX Developer is ignored.
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