Mitsubishi Electric MELSEC-L LD75D, User Manual

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CHAPTER 6 PROGRAM USED FOR POSITIONING CONTROL
6
6.
1 Pr
ecaut
ions
fo
r Creat
ing Pro
g
ram
(5) Communication with LD75
There are two methods for communication with LD75 using the program: a method using an "intelligent function
device" and a method using a FROM/TO instruction.
In the program in this chapter and subsequent, the program example using the "intelligent function device" is
shown without using an FROM/TO instruction for communication with LD75.
When using the FROM/TO instruction for communication with LD75, change the circuit incorporating the
"intelligent function device" as follows.
• When the circuit uses the "intelligent function device" on the destination (D) side of a MOV instruction,
change the instruction to a TO instruction.
• When the circuit uses the "intelligent function device" on the source (S) side and the destination (D) side of a
MOV instruction, change the instruction to a FROM instruction and a TO instruction.
• When the circuit uses the "intelligent function device" for a comparison instruction, change the instruction to
a FROM instruction and a comparison instruction.
• When the circuit uses the "intelligent function device" for a WAND instruction, change the instruction to a
FROM instruction and a WAND instruction.
Intelligent function device
Designated
value
at U0
Designated
value
at G1505
Number of
write data (1)
Set the same device.
Data read out
Data read out