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6. PROGRAMMING
MELSEC-A
6.3.3
Positioning
start
program
There are two start programs (a) and (b) below.
When setting data is written by using a peripheral device or AD71TU
The program
is simple because
it
is not necessary to communicate
setting data between a CPU and A1 SD71.
This method is recommended when the positioning data is within
400
points and there are few setting data changes.
When setting data is externally set
When there are a great many positioning data changes, communications
between the CPU and AlSD71 and a program for the writingheading
to/from the buffer memory are necessary.
Many data registers and programs
must be utilized and the operations
takes a long time. Therefore, simplify operations without using unneces-
sary programs.
6 - 15
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