9-14
FROM(P),DFRO(P)
(2) When 0 is specified in n3 as the number of data to be read, no processing is performed.
(3) The number of data to be read changes depending on the target CPU module.
Read of data from the CPU shared memory can also be performed using the
intelligent function module devices.
For intelligent function module device, refer to the QnUCPU User's Manual
(Function Explanation, Program Fundamentals) or Qn(H)/QnPH/QnPRHCPU
User's Manual (Function Explanation, Program Fundamentals).
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.
(1) When the specified data is outside the following range. (Error code: 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 plus 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.
(2) The CPU module does not exist in the position specified by the CPU module head I/O
number. (Error code: 2110)
(3) When the head 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
Basic model QCPU
1 to 256
Universal model QCPU
1 to 7168
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