INFICON SKY CDGxxxD (Profibus) User Manual
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tira54e1-a (2009-01) CDGxxxD.cp
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The 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 Hysteresis value of 2 will result in a
trip point condition being set when the (Analog Input Sensor) ProcessValue goes
above 100 and cleared when ProcessValue drops below 98.
Similarly, a Low Trip Point of 100 and a Hysteresis of 2 will result in a trip point
condition being set when ProcessValue falls below 100 and cleared when
ProcessValue increases above 102.
This parameter specifies the Analog Sensor Object Instance from which Value is
compared to High or Low Trip Point. This value is fix set to instance 1 (CDG)
because the ATM sensor (instance 2) does not support trip points.
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
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)
This parameter specifies the trip point function block behavior. See section 11.1.
Parameter value
Description
0 Setpoint
function
> 0…100
Atmosphere detection
This parameter corresponds to the "Atmosphere detection" function. It specifies the
value at or above which a trip point condition will occur. See section 11.1.2.
This parameter enables/disables the High Trip Point (Atmosphere detection)
setting.
Parameter value
Description
0
disable Atmosphere detection setting
1
enable Atmosphere detection setting
11.2.5 Hysteresis (ID 24)
11.2.6 Analog Input Sensor
Function Block Instance
(ID 27)
11.2.7 Data Units (ID 28)
11.2.8 Data Type (ID 29)
11.2.9
Percentage of ATM
(ID 201)
11.2.10 High Trip Point
(ID 202)
11.2.11 High Trip Enable
(ID 203)