Mitsubishi Electric Melsec QJ71LP21 Reference Manual page 259

7 APPLICATION FUNCTIONS
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2) Available devices
The following devices are available for the dedicated instructions:
Internal devices
1
Bit
X, Y, M, L, F, V, B T, ST, C, D, W
1: Word device bit specification is available for bit data.
A bit of a word device is specified with Word device and Bit No. .
(Bit No. must be specified in hexadecimal.)
For example, bit 10 of D0 is specified as D0.A .
Note that bit specification is not allowed for timers (T), retentive timers (ST), and
counters (C).
2: Available devices are given in each of the Constant column.
3) When specifying the target of dedicated instructions by network No.
If multiple network modules with the same network number are
mounted, execution target will be as follows.
CPU type
Host station is the
Universal model QCPU
Host station is not the
Universal model QCPU
File register
Word
R, ZR
Description
A network module mounted on the slot with the
smallest number in a base unit is targeted.
A network module to which the smallest start I/O
number has been assigned in the I/O assignment tab of
the PLC parameter dialog box.
MELSEC-Q
2
Constant
K, H, $
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