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B
Update local, expansion.
D
Scan Local and
expansion inputs
Execute Global Tasks
Feed the CPU watch-dog
Start counting ladder scan time
Execute main Ladder
Stop counting ladder scan time
Execute First Scan operations
(1. Initialize special inputs and
outputs. 2. Load Digital filter
constant.)
Update High speed
counter registers
Update local,
expansion and PWM
outputs
Feed watch-dog
Respond to the
monitor query (if any)
on USB.
Stop counting main loop
scan time
C