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MELSEC-Q/QnA
3 CONFIGURATION OF INSTRUCTIONS
(2) When using word devices
Word devices are designated in 1-point (16 bits) units.
M0
MOV K100 D0
1 D0 point (16 bits) is word device
POINTS
(1) When digit designation processing is conducted, a random value can be used
for the bit device initial device number.
(2) Digit designation cannot be made for the direct device designation DX and DY.
3.2.3 Using double word data (32 bits)
Double word data is 32-bit numerical data used by basic instructions and application instructions.
The two types of double word data that can be dealt with by CPU module are as follows:
• Decimal constants...............K-2147483648 to K2147483647
• Hexadecimal constants.......H00000000 to HFFFFFFFF
Word devices and bit devices designated by digit designation can be used as double word data.
For direct access input (DX) and direct access output (DY), designation of double word data is not
possible by digit designation.
(1) When using bit devices
(a) Digit designation can be used to enable a bit device to deal with double word data.
Digit designation of bit devices is done by designating ” Number of digits
Initial number of bit device ”.
Digit designation of bit devices can be done in 4-point (4-bit) units, and designation can be
made for K1 to K8.
(For link direct devices, designation is done by ”J Network No.
\ Digit designation
Initial number of bit device
” . When X100 to X11F are designated for Network No.2, it is
done by J2\K8X100.)
For example, if X0 is designated for digit designation, the following points would be
designated:
• K1X0.........The 4 points X0 to X3 are designated
• K2X0.........The 8 points X0 to X7 are designated
• K3X0.........The 12 points X0 to XB are designated
• K4X0.........The 16 points X0 to XF are designated
• K5X0.........The 20 points X0 to X13 are designated
• K6X0.........The 24 points X0 to X17 are designated
• K7X0.........The 28 points X0 to X1B are designated
• K8X0.........The 32 points X0 to X1F are designated
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