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11 PROCESS CONTROL INSTRUCTIONS
11.1 Overview
Precautions
Overlapping of specified data areas
The process control instructions check for area overlapping of input and output data. Specify input and output data after
checking their areas are not overlapped.
Example of area overlapping caused by a process control instruction
In the above example, the areas of (d1) and (d2) specified in the setting data are overlapping and an error results.
Operand specification
Regardless of the program language used, specify devices for the operations of process control instructions. Do not specify
labels.
Errors of process control instructions
When an error occurs in process control instructions, the detailed information of the error is stored in SD81 to SD111 (detailed
information 1) and SD113 to SD143 (detailed information 2). For the information to be stored, refer to the following.
MELSEC iQ-R CPU Module User's Manual (Application)
(s1) (d1) (s2) (d2)
S.IN R500 R800 R600 R700
MODE
ALM
BW
BB
R700
R701
R703
R800
R802
R800
R802
R801
R827
………
(d1) area
(3 words)
(d2) area
(128 words)
Loop tag past
value memory
Overlapping area
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