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MELSEC-Q
10 DEVICES
Default Values
Class Type Device Name
Number of Points Range Used
Parameter
Designated
Setting Range
Reference
Section
Intelligent
function
module
device
Word device Buffer register 65536 points
Un\G0 to
Un\G65535
2
Unchangeable Section 10.5
Index
register
Word device Index register 16 points Z0 to Z15 Unchangeable Section 10.6
File register Word device File register 0 points ——
0 to 1018 k points
(1 k units)
Section 10.7
Nesting —— Nesting 15 points N0 to N14 Unchangeable Section 10.8
Pointer 4096 points P0 to P4095 Section 10.9
Pointers ——
Interrupt pointer 256 points I0 to I255
Unchangeable
Section 10.10
SFC block 320 points BL0 to BL319 Section 10.11.1
Bit devices
SFC transition device 512 points TR0 to TR511 Section 10.11.2
Network No 256 points J1 to J255 Section 10.11.3
Other
——
I/O No —— U0 to UFF
Unchangeable
Section 10.11.4
Decimal constants K-2147483648 to K2147483647 Section 10.12.1
Hexadecimal constants H0 to HFFFFFFFF Section 10.12.2
Real number constants E 1.17549-38 to E 3.40282+38 Section 10.12.3
Constants ——
Character string
constants
"ABC" and "123" Section 10.12.4
REMARK
1: For the timer, retentive timer, and counter, bit devices are used for the "contact"
and the "coil", and the word device is used for the "present value".
2: The actual number of usable points varies according to the intelligent/special
function module.
For details regarding the buffer memory's "number of points", refer to the
Intelligent/Special Function Module Manual.
3: Inputs, outputs, step relays, link special relays, link special registers remain at
their default values, which cannot be changed.
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