Allen-Bradley 1747-PT1, User Manual

Page: 189 / 465

Chapter 12
Monitoring Controller Operations
12–10
To change online data, begin by monitoring the program online while the
processor is in either the Run or Test Continuous Scan (CSN) mode.
] [
] [ ] [
2.0.0.0.1
F1 F2 F3 F4 F5
( )
( )
] [ ] [ ] [
MODE FORCE EDT_DAT SEARCH
RUN
] [
] [
( )
XIC:I1:1.0/0 NO FORCE
(RES)
(CTU)
Observe the following:
•
XIC instruction C5:0/15 (count–up bit) and rung 1 are true whenever rung
0 is true, and false whenever rung 0 is false.
•
Each time rung 0 makes a false to true transition, the accumulator value
increments. Position the cursor on the CTU instruction and press [
ZOOM
]
to display the counter accumulator value.
•
When the accumulator value equals the preset, 3, XIC instruction C5:0/13
(done bit) goes true, making rung 2 true. The instruction remains true as
long as the accumulator is greater than or equal to the preset value.
To change the counter preset or accumulator values or the status bits:
1. Press EDT_DAT from either the zoom display or the online monitor
display. A screen similar to the one below appears.
Counter C5:0
CU
CD DN OV UN UA
STATUS 0 0 1 0 0 0
PRESET 3
ACCUM 16
STATUS=001000 RUN
F1 F2 F3 F4 F5
NEXT_PG PREV_PG ADDRESS NEXT_FL PREV_FL
In this display, the accumulator (ACCUM) is 16 and the done bit DN (bit
13) is set. Reset the counter by making rung 4 true momentarily. The
accumulator value and the done bit are reset to zero.
2. Change the preset and accumulator values from the EDT_DAT screen.
Press the down arrow key to place the cursor on the preset. Type
32767
(maximum value) and press [
ENTER
]. Press the down arrow key to place
the cursor on the accumulator (ACCUM). Type
32767
(maximum value)
and press [
ENTER
]. The display appears as follows:
Counter C5:0
CU
CD DN OV UN UA
STATUS 0 0 1 0 0 0
PRESET 32767
ACCUM 32766
STATUS=32766 RUN
F1 F2 F3 F4 F5
NEXT_PG PREV_PG ADDRESS NEXT_FL PREV_FL
Allen-Bradley Parts