INFICON PSG55x ATM to Medium Vacuum Gauge (Profibus) - Manual (Page 49)

tira56e1 (2010-02) PxG55x.cp
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The Low Trip Point Hysteresis value specifies the amount by which the Analog
Input Sensor ProcessValue must recover in order to clear a trip point condition.
For example: A Low Trip Point of 100 and a Low Trip Point Hysteresis value of 2
will result in a trip point condition being set when the (Analog Input Sensor)
ProcessValue falls at or below 100 and cleared when ProcessValue increases
above 102.
This value is only used for the calculation of Trip Point value in "ATM Mode".
The basic device multiplies this value with the pressure from the Atmosphere
Pressure sensor (Analog Sensor Instance x (ATM Sensor)) and copies the result
into the variable "High Trip Point" or "Low Trip Point", depending on the parameter
"Setpoint Mode" (ID 202).
The following different modes are available:
Mode Functionality Low Trip Point Functionality High Trip Point
0 Setpoint Mode:
Value settable by pushbutton and
Profibus
Setpoint Mode:
Value settable by pushbutton and
Profibus
1 ATM Mode:
Trip point value calculated by
Factor of ATM
Setpoint Mode:
Value settable by pushbutton and
Profibus
2 Setpoint Mode:
Value settable by pushbutton and
Profibus
ATM Mode:
Trip point value calculated by
Factor of ATM
4 Setpoint Mode:
Value settable only by Profibus
Setpoint Mode:
Value settable only by Profibus
If only one High Trip Point or Low Trip Point is enabled: Pushbutton
works on that Trip Point which is enabled.
If both High Trip Point and Low Trip Point are enabled: Pushbutton
works only on Low Trip Point
11.2.11 Low Trip Point
Hysteresis (ID 32)
11.2.12 Factor of ATM (ID 201)
11.2.13 Setpoint Mode
(ID 202)