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553
Temperature Input Unit Functions
Section 11-6
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 results
(within Temperature Data
Status Flag) bit 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 - 10-2009
Страница 1: ...Cat No W457 E1 07 CompoNet Slave Units and Repeater Unit CRT1 Series OPERATION MANUAL...
Страница 2: ......
Страница 3: ...CRT1 Series CompoNet Slave Units and Repeater Unit Operation Manual Revised October 2009...
Страница 4: ...iv...
Страница 6: ...vi...
Страница 10: ...x...
Страница 16: ...xvi...
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...
Страница 672: ...648 Index...
Страница 674: ...650 Revision History...