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FX Series Programmable Controllers STL Programming 3
3-20
3.12 Advanced STL Use
STL programming can be enhanced by using 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 assignment of state relays, special auxiliary relays (M
coils) is made. The IST instruction provides the user with a pre-formatted way of creating a
multi-mode program. The modes available are:
a) Automatic:
- Single step
- Single cycle
- Continuous
b) Manual:
- Operator controlled
- Zero return
More details on this instruction can be found on page 5-67.