506
7 APPLICATION INSTRUCTIONS
7.8 Buffer Memory Access Instructions
7.8 Buffer Memory Access Instructions
Reading 1-word data from the intelligent function module,
reading 2-word data from the intelligent function module
FROM(P), DFRO(P)
*1 Specified with the upper three digits when the head I/O number is expressed in 4 hexadecimal digits.
■FROM
• Reads the data in n3 words from the buffer memory address designated by n2 of the intelligent function module designated
by n1, and stores the data into the area starting from the device designated by (D).
• 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.
■DFRO
• Reads the data in (n3 2) words from the buffer memory address designated by n2 of the the intelligent function module
designated by n1, and stores the data into the area starting from the device designated by (D).
• 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.
n1: Head I/O number of an intelligent function module
*1
(BIN 16 bits)
n2: Head address of the buffer memory where data to be read is stored (BIN 16 bits)
(D): Head number of the devices where the read data will be stored (BIN 16/32 bits)
n3: Number of read data (BIN 16 bits)
Setting
data
Internal device R, ZR J\ U\G Zn Constant
K, H
Others
U
Bit Word Bit Word
n1
n2
(D)
n3
Basic
Process
High
performance
Redundant
Universal
LCPU
Command
Command
n3
n3
P
n1
n1
n2
n2
D
D
FROM, DFRO
FROMP, DFROP
indicates an instruction symbol of FROM/DFRO.
CPU module
n3 words
n3 points
n2
Device designated
by
D
Intelligent function module
buffer memory
D
CPU module
(n3 2) words
n2
n2+1
Device designated
by
(n3 2) points
Intelligent function module
buffer memory
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