Basic SFC Functions
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4-15. Items To Note When Programming
, Contacts’ structure and step number
Even in the sequencial control circuit with the same action, it’s also available to simple the
and save program’s steps according to the contacts’ structure. General program principle is:
he circuit with many serial contacts on the top；b)write the circuit with many parallel contacts
left.
, Program’s executing sequence
Handle the sequencial control program by【From top to bottom】and【From left to right】
ncial control instructions also encode following this flow.
, Dual output dual coil’s activation and the solution
If carry on coil’s dual output (dual coil) in the sequencial control program, then the backward
action is prior.
Dual output (dual coil) doesn’t go against the input rule at the program side. But as the preceding
action is very complicate, please modify the program as in the following example.
1
program
a)write t
in the
2
Seque
3
z
z
Y0
Y0
X0 X2
X3 X4
Y0
X0 X2
X3 X4
M0
M1
X0 X2
X3 X4
Y0
M0
M1
There are other methods. E.g. jump instructions or step ladder. However, when use step ladder, if the
main program’s output coil is programmed, then the disposal method is the same with dual coil, please
note this.
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