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Analog I/O Slave Unit (input) Functions
Section 11-4
11-4-5 Top/Valley Hold
Description
Top/valley hold is used to hold the top and valley values of the analog input
value.
Analog values that fluctuate more than twice the hysteresis value are moni-
tored, and the top or valley values are held. The top or valley value is allo-
cated along with the Top/Valley Detection Timing Flags, which can be used to
check the hold timing.
When the Hold Flag (output) allocated in the OUT Area turns ON, the hold
function starts, refreshing the top or valley value until the Hold Flag turns OFF.
(The last value is held when the Hold Flag turns OFF, but the next time the
Hold Flag turns ON, the hold value is initialized as soon as a top or valley
occurs.) The comparator can be used to compare the top or valley value allo-
cated as analog data. (Refer to details on the comparator function.)
■
Example of Valley Hold
Note
1.
A delay in network transmission time will occur from the time the Hold Flag
turns ON (or OFF) in the Master Unit’s ladder program until notification of
the flag’s status is actually sent to the Slave. Therefore, even after the Hold
Flag is ON, the first analog data transmitted to the Master Unit after the
CPU Unit power is turned ON may be the data from when the Hold Flag
was OFF. To collect top/valley hold data using the Hold Flag at the Master
Unit, configure a ladder program which considers the transmission delay
time when the Hold Flag is turned ON, and enables only the top/valley hold
values after a fixed time lag.
2.
The time that the Top/Valley Detection Timing Flags are ON can be adjust-
ed by setting the one-shot time. Use the CX-Integrator to set the one-shot
time (the setting range is 1 to 65,535 ms).
3.
If the Hold Flag turns OFF during the time the Top/Valley Detection Timing
Flag is set to be ON, both flags will turn OFF simultaneously.
Setting Using the CX-Integrator
1,2,3...
1.
Turn ON the power supply to the CompoNet Slave Unit.
2.
Double-click the icon of the Slave Unit to set in the Network Configuration
Window to open the Configuration Window. (Alternatively, right-click the
icon and select
Parameters - Edit
from the pop-up menu.)
3.
Select the Tab Page for the input where top/valley hold is to be set, and se-
lect
Top/Valley
under the
Function Choice
heading.
Analog input value
Valley hold value
Last value is held.
Hold value
Hold Flag
Hold function starts
Hold function stops
Top/Valley Detection
Timing Flag
One-shot time
Содержание CRT1 - 10-2009
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Страница 3: ...CRT1 Series CompoNet Slave Units and Repeater Unit Operation Manual Revised October 2009...
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Страница 24: ...xxiv Conformance to EC Directives 6...
Страница 386: ...362 Units with Connectors Section 6 7...
Страница 414: ...390 Temperature Input Units Section 7 5...
Страница 430: ...406 Expansion Unit Specifications Section 8 2...
Страница 486: ...462 Bit Slave Units with Compact Connectors Section 9 5 Dimensions CRT1B MD02JS and CRT1B MD02JS 1 15 21 65 24 48 9 mm...
Страница 494: ...470 Bit Slave Units with Compact Connectors Section 9 5...
Страница 501: ...477 Repeater Unit Section 10 2 Dimensions 42 3 50 3 1 27 5 95 mm...
Страница 502: ...478 Repeater Unit Section 10 2...
Страница 508: ...484 CX Integrator Section 11 1...
Страница 509: ...485 CX Integrator Section 11 1...
Страница 602: ...578 Temperature Input Unit Functions Section 11 6...
Страница 614: ...590 Device Maintenance Section 12 3...
Страница 664: ...640 I O Power Supply Current Appendix E...
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