IDEC MicroSmart pentra FC5A-C10R2, User Manual

Page: 284 / 473

7: B
ASIC
I
NSTRUCTIONS
7-14 FC5A M
ICRO
S
MART
U
SER
’
S
M
ANUAL
FC9Y-B1268
CUD (Up/Down Selection Reversible Counter)
The up/down selection reversible counter CUD has a selection input to switch the up/down gate, so that three inputs are
required. The circuit for an up/down selection reversible counter must be programmed in the following order: preset
input, pulse input, up/down selection input, the CUD instruction, and a counter number C0 through C255, 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
Ladder Diagram
I0
I1
CUD C2
500
I2
Preset Input
Pulse Input
U/D Selection
I3 C2
Instruction Data
LOD
LOD
LOD
CUD
LOD
AND
OUT
I0
I1
I2
C2
500
I3
C2
Q2
Program List

The same counter number cannot be pro-
grammed 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 count-
ing may begin.

The up mode is selected when the up/down selec-
tion input is on.

The down mode is selected when the up/down
selection input is off.

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 dur-
ing counter operation, the change becomes effec-
tive immediately.

For the data movement when changing, confirm-
ing, and clearing preset values, see page 7-18. Pre-
set values can also be changed and changed
preset values can be confirmed using the HMI
module. See pages 5-63 and 5-65.

WindLDR ladder diagrams show CP (counter pre-
set value) and CC (counter current value) in
advanced instruction devices.
500 500
Preset Input I0
ON
OFF
Pulse Input I1
ON
OFF
U/D Selection
ON
OFF
Timing Chart
Counter C2
ON
OFF
500 501 502 501
Counter C2 Value
500 499 0 1
• • •
• • •
Q2
Valid Pulse Inputs
The reset or preset input has priority over the pulse input.
One scan after the reset or preset input has changed from
on to off, the counter starts counting the pulse inputs as
they change from off to on.
Reset/Preset
ON
OFF
Pulse
ON
OFF
More than one scan
time is required.
Valid Invalid Valid
Input I2

For restrictions on ladder programming
of counter instructions, see page 7-32.
Phone: 800.894.0412 - Fax: 888.723.4773 - Web: www.clrwtr.com - Email: info@clrwtr.com