Download type A2USHCPU-S1 User's Manual

4. CPU MODULE
MELSEC-A
Power-on
Initial processing
• Initialization of I/O module
• Initialization of data memory
• I/O address allocation of I/O module
• Self-diagnosis
• Set link parameter
Refresh processing of I/O module
(only when the I/O control is set up for the
refresh processing)
Operation processing of the sequence program
Step 0
to
Until the execution of END (FEND) instruction
END processing
• Self-diagnosis
• Updating current value of the timer and
counter, and setting the contacts ON/OFF
• Communication with computer link module
• Link refresh processing
• Sampling trace processing
• MELSECNET/MINI-S3 automatic refresh
processing
Figure 4.1 A2USHCPU-S1 operation processing
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