Mitsubishi 00JCPU, Руководство пользователя

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(1) Devices that can be used as local devices
The following devices can be used as local devices.
• Internal relay (M)
• Edge relay (V)
• Timer (T, ST)
• Counter (C)
• Data register (D)
(2) Saving and restoring a local device file
When some programs use a local device, respective local device file data in the standard RAM or a memory card
(SRAM) are exchanged with the device memory data of the CPU module after execution of each program.
For this reason, the scan time increases by the time spent for data exchange.
Remark
1. There are some instructions for which a local device cannot be specified.
For details, refer to the pages describing devices available for each instruction in the following manual.
MELSEC-Q/L Programming Manual (Common Instruction)
2. For the concept of the number of words used for the local devices, refer to Section 9.2.
Figure 9.99 Saving and restoring local device files
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