685
FROM, FROMP, DFRO, DFROP
9
2
3
4
4
6
7
8
9.2 Reading from the CPU Shared Memory of another CPU
9.2.1 FROM, FROMP, DFRO, DFROP
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.
Program Example
(1) The following program stores data of 10 points from address 800
H
of the CPU shared memory of CPU No. 2. into the
area starting from D0 when X0 is turned ON.
[Ladder Mode] [List Mode]
Remark
(1) The value of n1 is specified by the first 3 digits of the hexadecimal 4digits which represent the head I/O number of the
slot mounted to the CPU module.
(2) The QCPU provides automatic interlocks for the FROM and TO instructions.
Error
code
Error details
Q00J/
Q00/
Q01
QnH QnPH QnPRH QnU LCPU
2110
No CPU module is installed at the position specified for the head I/O
number of the CPU module.
–– –– –– ––
4101
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 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)
–– –– –– ––
CPU Slot Slot 0 Slot 1 Slot 2
Head I/O number 3E00 3E10 3E20 3E30
n1 3E0 3E1 3E2 3E3
D
Step
Instruction
Device
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