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MELSEC-Q 
 
1    GENERAL SPECIFICATIONS AND PRECAUTIONS FOR USE 
1.2.3 I/O combined module 
(1) I/O numbers of I/O combined modules 
There are two types of I/O combined modules: 
•  Module using same I/O numbers for input and output 
Since same number is used for input and output, the I/O numbers to be 
used can be saved. 
 
•  Module using sequential I/O numbers for input and output 
Since I/O assignments are the same for A series, it is useful when replacing 
modules from those of A series. 
 
 
Module using same I/O numbers for input 
and output (QH42P) 
Module using sequential I/O numbers for input 
and output (QX41Y41P) 
 
(2) Configuration of when an I/O combined module is used 
For the QH42P, QX41Y41P, and QX48Y57, use them in the configuration below. 
Product Description  Precautions 
CPU module 
The module whose serial number 
(first 5 digits) is "01112" or later 
- 
GX Developer 
SW4D5C-GPPW or earlier 
• Use it with "Output" being set to 
the I/O assignment. 
• Input response time cannot be 
set. (fixed at 10ms) 
SW5D5C-GPPW or later 
Use it with "I/O combined" being 
set to the I/O assignment. 
For how to check the serial number of the CPU module, refer to the QCPU User's 
Manual (Hardware Design, Maintenance and Inspection). 
 
 
Vacant
32 points
Input (X) Output (Y)
X00
X1F
Y00
Y1F
00
1F
X00
X1F
00
1F
Vacant
Y20
Y3F
20
3F
Input (X) Output (Y)
32 points
32 points