Download

Function Blocks:
Continuous (time) control
Industrial Automation
Function blocks And Flow Chart
Sequential Flow Charts:
Discrete (time) Control
Many PLC applications mix continuous and discrete control.
A PLC may execute alternatively function blocks and flow charts.
A communication between these program parts must be possible.
Principle:
The flow chart taken as a whole can be considered a function
block with binary inputs (transitions) and binary outputs (states).
77/100 2.3 Programmable Logic Controllers