Reference – Rockwell Automation 1761 MicroLogix 1000 Programmable Controllers User Manual

Page 357

Application Example Programs

E–7

Rung 2:2
Forces a high-speed counter low preset interrupt to occur each REM Run
mode entry. An interrupt can only occur on the transition of the
high-speed counter accum to a preset value (accum reset to 1, then 0).
This is done to allow the high-speed counter interrupt subroutine
sequencers to initialize. The order of high-speed counter
initialization is: (1)load high-speed counter parameters (2)execute
HSL instruction (3)execute true HSC instruction (4)(optional) force
high-speed counter interrupt to occur.

Rung 2:3
Starts the conveyor in motion when the start button is pressed.
However, another condition must also be met before we start the
conveyor: the drill bit must be in its fully retracted position
(home). This rung also stops the conveyor when the stop button is
pressed.

➀

0 |

| | Machine | |
| | RUN | |
| | Latch | |
| | B3 | |
| +––––] [––––––––––––––––+ |
| 0 |

Rung 2:4
Applies the above start logic to the conveyor and drill motor.

| Machine Drill |Conveyor |
| RUN Home LS |Enable |
| Latch |
| B3 I:0 O:0 |
|––––] [––––––––––––––––––––––––––––––––––––+––––] [––––––––( )–––––+–|
| 0 | 5 5 | |
| | Drill | |
| | Motor ON | |
| | O:0 | |
| +–––––––––––––––( )–––––+ |
| 1 |

➀

This instruction accesses I/O only available with 32 I/O controllers. Do not include this instruction if you are using
a 16 I/O controller.

Reference