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Repeated Operation Processing; In~ial Processing - Mitsubishi Electric MELSEC-A Series User Manual

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4.A2CCPU
- - - - - - - - - - - - - - - - - - MELSEC-A
4.1 .1
Repeated operation processing
Sequence programs are written by the peripheral device and stored to the
A2C user program area (maximum 8K steps).
The A2C reads the required program sequentially from the user program
area and performs the repeated operation processing in order of step 0 to
the [END)(FEND) instruction.
I
(1)
Stored program system
Sequentially reads and operates the program stored in the user pro-
gram area.
(2) Scanning
Operates the program in order of step numbers from step 0 to the
[END)(FEND).
Flg.4.1 Sequence Program Operation Processing
I
Step number
Sequence program
0
LD
XOOO
n
1
OR
YOlO
2
ANI
XOO1
3
OUT
YOlO
,
+
to
,
J
END
4.1.2
Initial processing
Initial processing initiates the sequence program operation processing. The
following initial processing is executed when the A2C is turned ON or reset
by the RUN key switch.
Initial processing time is 2 to 3 seconds though it varies with system con-
411
figuration
(1)
I/O modules initialization
Resets and initializes the I/O modules.
(2)
Data memory clear
Clears the data memory which is not latched by the peripheral.
(3)
Link parameter setting
In the case of a MELSECNET link station, link parameter data is set to
a data link module before starting data link.
4-4

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