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MELSEC-Q
10 DEVICES
10.13 Convenient Uses for Devices
When executing multiple programs in the High Performance model QCPU, local
devices among the internal user devices can be designated to execute each of the
programs in an independent manner.
Moreover, the device initial settings allow the data setting for devices and intelligent
function modules/special function modules without using a program.
10.13.1 Global devices and local devices
A number of programs can be stored and executed in the High Performance model
QCPU.
High Performance model QCPU devices are classified into "global devices" shared by
all the programs being executed and "local devices" used independently by each of the
programs.
(1) Global devices
(a) Global devices can be shared by all the programs being executed in the
High Performance model QCPU. Global device data are stored in the High
Performance model QCPU's device memory, and can be used by all
programs.
Y12
M0
Program A
Y11
M0
Program B
M0 ON/OFF data
Device memory
Internal relay
ON/OFF
M0
M0 ON/OFF data
Global devices are shared by all programs being executed.
High Performance model QCPU
(b) When executing multiple programs, the "shared range" for all programs, and
the "independent range" for each program must be designated in advance.
Example: Internal relay
M0
Shared by all programs
Used in program A
Used in program B
Used in program C
The "range of use" must be designated for each program.
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