Mitsubishi Electric MELSEC-Q/L Programming Manual page 862

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• When 0 is specified in n3 as the number of data to be read, no processing is performed.

• The number of data to be read changes depending on the target CPU module.

High Performance model QCPU

• An instruction which has been executed will result in non-processing if it fails to access the target module because the

module is faulty or busy in processing.

Read of data from the CPU shared memory can also be performed using the intelligent function module

For intelligent function module device, refer to the User's Manual (Function Explanation, Program

Fundamentals) for the CPU module used.

Operation error

• In any of the following cases, an operation error occurs, the error flag (SM0) turns ON, and an error code is stored into SD0.

Error details

No CPU module is installed at the position specified for the head I/O number

of the CPU module.

The head of the CPU shared memory address (n2) which performs reading

is outside the CPU shared memory range.

The address of the CPU shared memory (n2) which performs reading + the

number of read points (n3) is outside the CPU shared memory range.

The read data storage device number (D) plus the number of read points

(n3) is outside the specified device range.

When the head of the CPU shared memory address (n2) which performs

reading is an invalid value. (4097 to 9999)

Program example

• The following program stores data of 10 points from address 800H of the CPU shared memory of CPU No. 2. into the area

starting from D0 when X0 is turned ON.

[Ladder Mode]

9 MULTIPLE CPU DEDICATED INSTRUCTIONS

9.2 Reading from the CPU Shared Memory of Another CPU

Number of read points