Mitsubishi A2CCPU User Manual

4. AXCPU /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 A2CPU reads the required program sequentially from the user
program area
and performs the repeated operation processing in
order
of step 0 to the -1 (FEND) instruction.
(1) Stored program system
Sequentially reads and operates the program stored
in the
user program area.
(2) Scanning
Operates the program in order of step numbers from step
0 to
the
(FEND).
Step number Sequence program
2
3 YO10
1
END
Fig. 4.1 Sequenca Program Operation Processing
4.1.2 Initial processing
Initial processing initiates the sequence program operation pro-
cessing. The following initial processin is executed when the A2C
is turned or reset by the key switch.
Initial processing time is 2 to 3 seconds though it varies with
system configuration.
(1) VO 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) Self-diagnosis
The PC CPU conducts self-checks when it is powered up or
reset.
For further details, see Section 4.3.1.

Mitsubishi A2CCPU Specifications

General

Brand	Mitsubishi
Model	A2CCPU
Category	Controller
Language	English