Mitsubishi MELSEC Q Series, Руководство по программированию

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8.12 Reading Data from Other CPU Shared Memory
8.12.1 Reading data from other CPU shared memory
8-63
8
QCPU INS
T
R
UCTIONS
FROM, DFRO
FROM, DFRO
DFRO(P)
(1) Reads (n3 2) words of data from the CPU shared memory address specified for n2 of the
CPU module specified for n1, and stores the data to and the following devices.
(2) No processing is performed when read data n3 is 0.
(3) The number of data that can be read varies depending on the target CPU module.
Data read from the CPU shared memory can also be performed using the
intelligent function module devices.
For the intelligent function module device, refer to the following manual.
• QCPU User's Manual (Function Explanation, Program Fundamentals)
O perat i on E rror
In any of the following cases, an operation error occurs, the error flag (SM0) is turned ON, and
the corresponding error code is stored to SD0.
(1) When the specified value is outside of the following range. (Error code: 4101)
• The address of the CPU shared memory (n2) from which data are read plus the number
of read points (n3) is outside of the CPU shared memory range.
• The address of the CPU shared memory (n2) from which data are read plus the number
of read points (n3) is outside of the CPU shared memory range.
• The read data storage device number (D) plus the number of read points (n3) is outside of
the specified device range.
(2) The CPU module does not exist in the position specified by the CPU module start I/O
number. (Error code: 2110)
(3) When the start of the CPU shared memory address (n2) which performs reading is an invalid
value. (4097 to 9999) (Error code: 4101)
CPU module Number of read points
Universal model QCPU
1 to 7168
d
Device memory
CP U s h ared memory of
t h e specified CP U (n1)
n3
n2
d
Reads
(n3 2)
words of data