1756-PM003H-EN-E, SFC and ST Programming Languages ...

Design a Sequential Function Chart 4-23
Here are two examples of transitions:
EXAMPLE
You want to:
a. Turn on 2 compressors. When a compressor is on,
the Device1State bit is on.
b. When both compressors are on, go to the next step.
Solution:
Init
Init_Done compressor_1.Device1State = on (1)
and
EXAMPLE
You want to:
a. Package the product. When the product is in the
package, the package_done bit turns on.
b. Pack the product either 8 per carton or 16 per
carton.
Solution:
Package
carton_8
carton_16
Pack_8
Pack_16
package_done = on (1) and
carton_size = 8
package_done = on (1) and
carton_size = 16
To override the state of a transition, see “Force Logic Elements” on
page 13-1.
Publication 1756-PM003H-EN-E (excerpt from 1756-PM001H-EN-P) - August 2005