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MELSEC-Q
10 DEVICES
(2) Local devices
(a) Local devices are used independently by the programs.
The use of local devices permits programming of multiple "independent
execution" programs without regard to other programs.
Local devices data can be stored in the standard RAM and the memory
card.
Y12
M7000
Program A
Y11
M7000
Program B
M7000 ON/OFF data
M7000 ON/OFF data
If local devices are designated as M7000 or later, they can be used independently in each
program executing M7000 or later.
High Performance model QCPU
Internal relay
ON/OFF
M7000
For program A
Internal relay
ON/OFF
M7000
For program B
Memory card
(b) Five device types can be used as local devices: internal relays (M), edge
relays (V), timers (T, ST), counters (C), and data registers (D).
(c) Programs used as local devices exchange the local device file data stored
in the memory card with the data in the device memory of High
Performance model QCPU.
Therefore the scan time is extended by this data exchange time.
Local device
Program A
Program B
Program C
Local device
Local device
Restored
Saved
Restored
Saved
Restored
Sequence program
For
program A
For
program B
For
program C
For
program A
For
program B
For
program C
For
program A
For
program B
For
program C
POINT
The local device may not be designated with some instructions.
Refer to the allowable device in the programming manual of each instruction for
details.
REMARK
See Section 10.1.2 (item 2) for details on the "number of words" for local devices.