INFICON PSG55x ATM to Medium Vacuum Gauge (Profibus) - Manual (Page 48)

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tira56e1 (2010-02) PxG55x.cp
This parameter contains the state of this object instance. The functionality is
described on page 46.
Parameter value Description
0 Trip Point condition doesn't exist (unasserted)
1 Trip Point condition exists (asserted)
This parameter specifies the associated Discrete Output Object Instance.
ID Meaning in the base unit
Instance 1
in Slot 2
Relay 1
Trip Point Object Instance 1 in the base unit
Instance 1
in Slot 3
Relay 2
Trip Point Object Instance 1 in the base unit
The instance is always one, because each Discrete Output Function Block (Slot 2
and Slot 3) has only one instance.
This parameter defines the units of Trip Point, Hysteresis, etc. according to the
following table:
Parameter value (hex) Unit
1001 COUNTS
1301 Torr
1308 mbar
1309 Pascal
For safety reasons, it is not possible to change the pressure unit while
the gauge is cyclically interchanging data with a DP/V0 master.
The data unit setting can only be modified when the gauge is in the IDLE
status.
In cyclic data traffic, the data unit must be set in the User Parameter
Data. All settings previously made in acyclic data traffic are overwritten.
→  12 "User Parameter Data"
If the data unit is set in one instance, that data unit setting applies to all
instances. Likewise, the data unit setting made in the User Parameter
Data is valid for all instances.
This parameter defines the data type of Trip Point, Hysteresis, etc. and all related
parameters.
The parameter can be changed via master class 2 acyclic data transfer only if the
device is not in cyclic data transfer with master class 1. The data type is valid for all
block instances of the device i.e. all parameter determining the data type shall have
the same value. A change of one data type parameter changes all other
parameters to the same value.
Parameter value Type
3 INT16
8 FLOAT
(default)
The High 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 High Trip Point of 100 and a High Trip Point Hysteresis value of 2
will result in a trip point condition being set when the (Analog Input Sensor)
ProcessValue goes at or above 100 and cleared when ProcessValue drops below
98.
11.2.6 Status (ID 21)
11.2.7 Discrete Output
Function Block Instance
(ID 26)
11.2.8 Data Units (ID 28)
11.2.9 Data Type (ID 29)
11.2.10 High Trip Point
Hysteresis (ID 31)