IDEC microsmart pentra, Руководство по программированию

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FT1A S
MART
A
XIS
U
SER
’
S
M
ANUAL
FT9Y-B1382 5-13
5: B
ASIC
I
NSTRUCTIONS
CDP (Dual-Pulse Reversible Counter)
The dual-pulse reversible counter CDP has up and down pulse inputs, so the three inputs are required. The circuit for a dual-pulse
reversible counter must be programmed in the following order: preset input, up-pulse input, down-pulse input, the CDP
instruction, and a counter number C0 through C199, followed by a counter preset value from 0 to 65535.
The preset value can be designated using a decimal constant or a data register. When a data register is used, the data of the data
register becomes the preset value.
Caution
500 500
Ladder Diagram
Preset Input I0
ON
OFF
Up Pulse I1
ON
OFF
Down Pulse I2
ON
OFF
Timing Chart
Counter C1
ON
OFF
500 501 502 501
Counter C1 Value
500 499 0 1
• • •
• • •
I0
I1
CDP C1
500
I2
Preset Input
Up Pulse
Down Pulse
I3 C1
 The same counter number cannot be programmed
more than once.
 The preset input must be turned on initially so that
the current value returns to the preset value.
 The preset input must be turned off before counting
may begin.
 When the up pulse and down pulses are on
simultaneously, no pulse is counted.
 The counter output is on only when the current value
is 0.
 After the current value reaches 0 (counting down), it
changes to 65535 on the next count down.
 After the current value reaches 65535 (counting up),
it changes to 0 on the next count up.
 When power is off, the counter’s current value is held,
and can also be designated as “clear” type counters
using the Function Area Settings (see page 5-5).

Counter preset and current values can be changed
using WindLDR without downloading the entire
program to the CPU again. From the WindLDR menu
bar, select
Online > Monitor > Monitor , then
Online > Custom > New Custom Monitor .
Change the current value while the counter preset
input is off.
 When the preset or current value is changed during
counter operation, the change becomes effective
immediately.

When power is off, the changed preset values are
cleared and the original preset values are loaded.

For the data movement when changing, confirming,
and clearing preset values, see page 5-18. Preset
values can also be changed and changed preset
values can be confirmed using the LCD and push
buttons. See pages 5-63 and 5-65.
 WindLDR ladder diagrams show CP (counter preset
value) and CC (counter current value) in advanced
instruction devices.
Q1

For restrictions on ladder programming of
counter instructions, see page 5-32.
LOD
LOD
LOD
CDP
LOD
AND
OUT
I0
I1
I2
C1
500
I3
C1
Q1
Program List
Instruction Data
Counter Operation after Count out
Counter Output Condition
When the counter has counted out,
either the current value or preset
value is changed.
The counter maintains the counted
out status.
Before the counter has counted out,
the current value is changed to a
larger value than the preset.
The counter output is turned on.
The preset value is changed to 0.
The counter output is turned on
without regard to the current value.
When the reset input is on, the
preset value is changed to 0.
The counter output is not turned on.