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3. STL Programming .................................................................................3-1
3.1 What is STL, SFC And IEC1131 Part 3?............................................................. 3-1
3.2 How STL Operates .............................................................................................. 3-2
3.2.1 Each step is a program ............................................................................................. 3-2
3.3 How To Start And End An STL Program ............................................................. 3-3
3.3.1 Embedded STL programs .........................................................................................3-3
3.3.2 Activating new states................................................................................................. 3-3
3.3.3 Terminating an STL Program .................................................................................... 3-4
3.4 Moving Between STL Steps ................................................................................3-5
3.4.1 Using SET to drive an STL coil ................................................................................. 3-5
3.4.2 Using OUT to drive an STL coil................................................................................. 3-6
3.5 Rules and Techniques For STL programs........................................................... 3-7
3.5.1 Basic Notes On The Behavior Of STL programs....................................................... 3-7
3.5.2 Single Signal Step Control ........................................................................................ 3-9
3.6 Restrictions Of Some Instructions When Used With STL.................................. 3-10
3.7 Using STL To Select The Most Appropriate Program .......................................3-11
3.8 Using STL To Activate Multiple Flows Simultaneously......................................3-12
3.9 General Rules For Successful STL Branching ..................................................3-14
3.10 General Precautions When Using The FX-PCS/AT-EE Software .....................3-15
3.11 Programming Examples .................................................................................... 3-16
3.11.1 A Simple STL Flow.................................................................................................. 3-16
3.11.2 A Selective Branch/ First State Merge Example Program....................................... 3-18
3.12 Advanced STL Use............................................................................................ 3-20
4. Devices in Detail....................................................................................4-1
4.1 Inputs................................................................................................................... 4-1
4.2 Outputs ................................................................................................................ 4-2
4.3 Auxiliary Relays ................................................................................................... 4-3
4.3.1 General Stable State Auxiliary Relays ...................................................................... 4-3
4.3.2 Battery Backed/ Latched Auxiliary Relays................................................................. 4-4
4.3.3 Special Diagnostic Auxiliary Relays .......................................................................... 4-5
4.3.4 Special Single Operation Pulse Relays..................................................................... 4-5
4.4 State Relays ........................................................................................................ 4-6
4.4.1 General Stable State - State Relays ......................................................................... 4-6
4.4.2 Battery Backed/ Latched State Relays...................................................................... 4-7
4.4.3 STL Step Relays ....................................................................................................... 4-8
4.4.4 Annunciator Flags ..................................................................................................... 4-9
4.5 Pointers ............................................................................................................. 4-10
4.6 Interrupt Pointers ............................................................................................... 4-11
4.6.1 Input Interrupts ........................................................................................................ 4-12
4.6.2 Timer Interrupts ....................................................................................................... 4-12
4.6.3 Disabling Individual Interrupts ................................................................................. 4-13
4.6.4 Counter Interrupts ................................................................................................... 4-13
4.7 Constant K......................................................................................................... 4-14
4.8 Constant H......................................................................................................... 4-14
4.9 Timers................................................................................................................ 4-15
4.9.1 General timer operation...........................................................................................4-16
4.9.2 Selectable Timers....................................................................................................4-16
4.9.3 Retentive Timers ..................................................................................................... 4-17
4.9.4 Timers Used in Interrupt and ‘CALL’ Subroutines ................................................... 4-18
4.9.5 Timer Accuracy .......................................................................................................4-18
4.10 Counters ............................................................................................................4-19
4.10.1 General/ Latched 16bit UP Counters ......................................................................4-20
4.10.2 General/ Latched 32bit Bi-directional Counters.......................................................4-21