FX Series Programmable Controllers STL Programming 3
3-20
3.12 Advanced STL Use
STL pro
g
rammin
g
can be enhanced b
y
usin
g
the Initial State Applied Instruction. This
instruction has a mnemonic abbreviation of IST and a special function number of 60. When the
IST instruction is used an automatic assi
g
nment of state rela
y
s, special auxiliar
y
rela
y
s (M
coils) is made. The IST instruction provides the user with a pre-formatted wa
y
of creatin
g
a
multi-mode pro
g
ram. The modes available are:
a) Automatic:
-Sin
g
le step
-Sin
g
le c
y
cle
- Continuous
b) Manual:
- Operator controlled
- Zero return
More details on this instruction can be found on pa
g
e 5-67.