Mitsubishi Q Series CPU Module Memory Composition

- Jun 19, 2019-

1, program memory

It is a memory that stores programs and parameters necessary for CPU module calculation.

1), program operation

The contents of the program memory are transferred to the program cache (memory for program operation) and executed at the timing described below.

· Initialization processing when the power is turned ON

· Initialization processing at reset

2), write to the program memory

When a program memory is written, its contents are automatically transferred to the program memory as soon as they are written to the program cache.

3), confirm the transfer status to the program memory

The transfer status to the program memory can be confirmed by the following method.

· How to confirm by the process screen

· Method for confirming by special relay and special register

The transfer status to the program memory can be confirmed by SM681 and SD681.

4), confirm the transfer status to the program memory

The transfer execution confirmation from the program cache to the program memory can be performed by the SM165.

When confirming the transfer status of the program memory in Q02UCPU, Q03UDCPU, Q04UDHCPU, and Q06UDHCPU, check the version of the CPU module and programming tool.

2, standard RAM

It is a memory for storing file register files, local device files, sample trace files, and module error history files.

In the general-purpose high-speed type QCPU, the capacity of the standard RAM can be expanded by installing an extended SRAM cartridge.

3, standard ROM

It is a memory for saving device comments, PLC user data, and so on.

4, memory card

Used to expand the memory of the CPU module. The available memory cards are as follows.

·SRAM card ·Flash card ·ATA card

5, SD memory card

Programs and parameters can be stored. When the program stored in the SD memory card is executed, it is performed by the boot operation. In addition, when using the data logging function, you must use an SD memory card.