Unipulse F372A - Screens Appearing When before Value Comparison Is Selected; Before Value Renewal Condition; Difference-HI;LO Limit Comparisons

121
2 EXP. COMPARISON FUNCTIONS
121
EXP. COMPARISON FUNCTIONS
Chapter
2
■Screens appearing when before value comparison is selected
Before-value-comparison-specific measurement screens appear.
Also, the Comparison Setting menu is dedicated.
■Before value renewal condition
The previous hold value used for Before Value Comparison is renewed under the following conditions:
1) When the hold is canceled (except when the Before Value Regulation is exceeded)
2) When the Before Value in the Comparison Setting menu is changed by inputting a value in a
similar manner to set values.
This is convenient for inputting a predetermined value at the first measurement, etc., and for
changing the Before Value as desired.
3) When an input is made by special-purpose input commands through the communication interface
(RS232C / CC-Link / DeviceNet)
■Difference-HI/LO limit comparisons
You can set Difference value-HI Limit and Difference value-LO Limit to compare the difference
between the previous hold value and present hold value.
- Difference value-HI Limit -99999 - 99999 Initial value: 1000
- Difference value-LO Limit -99999 - 99999 Initial value: -1000
When Before Value Comparison is made, judgments are made under the following conditions, and
respective results are output.
- HI Limit (HI) ON condition: Hold Value (indicated value) > HI Limit
OFF condition: Hold Value (indicated value) ≦ HI Limit
- LO Limit (LO) ON condition: Hold Value (indicated value) < LO Limit
OFF condition: Hold Value (indicated value) ≧ LO Limit
- Difference-HI Limit (DF-HI) ON condition: Difference value > Difference value-HI Limit
OFF condition: Difference value ≦ Difference value-HI Limit
- Difference-LO Limit (DF-LO) ON condition: Difference value < Difference value-LO Limit
OFF condition: Difference value ≧ Difference value-LO Limit
- OK ON condition: All of HI, LO, DF-HI, and DF-LO are OFF.
OFF condition: Any of HI, LO, DF-HI, and DF-LO is ON.
* The Hysteresis setting is not reflected in the Difference-HI/LO Limit comparison operation.
* If the Comparison Timing condition is not met, the comparison result of the value targeted for the
Comparison Timing turns OFF.
* In Before Value Comparison, HH Limit/LL Limit comparisons become ineffective.
* OK is displayed each on the LCD screen as the hold value is OK, and the difference value is OK.