466
Temperature Input Unit Functions
Section 11-5
Note
When the temperature input value changes faster than the conversion cycle,
the status may go from a Low Limit alarm directly to a High Limit alarm without
having the Normal Flag (pass signal) go ON in between. Write ladder pro-
grams to allow for this.
Setting Hysteresis
The Comparator Result Flag turns OFF when the value is lower than the hys-
teresis width (H or HH alarm occurs) or exceeds it (L or LL alarm occurs), as
shown in the following diagram. If the temperature input value fluctuates
around the threshold and the flag repeatedly turns ON or OFF, set hysteresis
to stabilize the flag operation. The setting range is 0 to 16,383.
Note
When setting the hysteresis value, allow for the decimal point position or the
1/100 Display Mode for each input. Always correct the hysteresis value after
changing the display mode or replacing the input with one that has a different
decimal point position.
Examples for an Hysteresis of 10
°
C:
• R thermocouple (normal display) setting: 0010 decimal
• T thermocouple (normal display) setting: 0100 decimal
• Setting for any input with 1/100 display: 1000 decimal
Set values
HH
H
L
LL
Comparator Result Flag
(in Analog Status Flags)
ON/OFF
HH alarm
H alarm
Normal Flag
(Pass signal)
L alarm
LL alarm
HH set value or
H set value
Hysteresis width
LL set value or L
set value
Hysteresis
width
HH Alarm Flag or
H Alarm Flag
LL Alarm Flag or
L Alarm Flag
Содержание CRT1 - 10-2008
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Страница 23: ...xxiv Conformance to EC Directives 6...
Страница 51: ...28 Slave Unit Models Section 1 2...
Страница 123: ...100 Connecting External I O for Slave Units Section 3 6...
Страница 365: ...342 Temperature Input Units Section 7 5...
Страница 381: ...358 Expansion Unit Specifications Section 8 2...
Страница 418: ...395 Repeater Unit Section 10 2 Dimensions 42 3 50 3 1 27 5 95 mm...
Страница 419: ...396 Repeater Unit Section 10 2...
Страница 424: ...401 CX Integrator Section 11 1...
Страница 575: ...552 Current Consumption Summary Appendix D 552...
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Страница 583: ...560 Revision History...