Time driven sequencer instruction list program – Rockwell Automation 1761-HHP-B30 MicroLogix 1000 with Hand-Held Programmer (HHP) User Manual

Page 469

Appendix E
Application Example Programs

E–26

Data Files

Address

Data

N7:0

0000

N7:1

0000

0100

N7:2

0000

0010

N7:3

0000

0001

Data Table

Address

Data

(Radix=Decimal)

N7:0

6000

1500

3000

Time Driven Sequencer Instruction List Program

File 2, Rung 0

The function of this rung is called a regenerative timer. Every time the
timer reaches its preset, the DONE bit is set for one scan––this causes
this rung to become FALSE for one scan and resets the timer. On the
following scan, when this rung becomes TRUE again, the timer begins
timing.

FUN GRAPHIC PARAMETER
CODE SYMBOL MNEMONIC NAME ADDRESS VALUE FORCES
–––– ––––––– –––––––– –––– ––––––– ––––– ––––––
21 |–]/[– LDI Timer Enable

T0/DN 0

0 TON Timer
TIMR T0
BASE 0.01
PRE 0001H
ACC 0000H

File 2, Rung 1

Controls the RED, GREEN, and YELLOW lights wired to outputs O:0/0 – O:0/2
and controls how long the regenerative timer times between each step.
When this rung goes from false-to-true (by the timer reaching its preset),
the first sequencer changes which traffic light is illuminated and the
second sequencer changes the preset of the timer to determine how long
this next light is illuminated.

FUN GRAPHIC PARAMETER
CODE SYMBOL MNEMONIC NAME ADDRESS VALUE FORCES
–––– ––––––– –––––––– –––– ––––––– ––––– ––––––
20 |–] [– LD Step SQO

T0/DN 0

152 SQO RED, GREEN and YELLOW lights

FILE #N0
MASK 0007H
DEST O0
CTRL R0
LEN 0003H
POS 0000H

152 SQO Timer presets for each light

FILE #N5
MASK FFFFH
DEST T0.PRE
CTRL R1
LEN 0003H
POS 0000H