INFICON SKY CDGxxxD (Profibus) - Manual (Page 32)

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tira54e1-a (2009-01) CDGxxxD.cp
This parameter determines the data type of ProcessValue and all related
parameters. Two data types are supported: Float and Integer16.
This 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. This means that all parameters determining the data
type will have the same value. A change of one data type parameter changes all
others to the same value.
It is possible to adjust the data type during cyclic data transfer start up (setting of
configuration data, CFG-String. In this case the data type value is updated with the
value requested by the configuration data.
The data type can be changed from Float to Integer16. After startup it is set to the
value stored in the EEPROM. The default setting is "Float".
Coding Data type
3 INT16
8 FLOAT
The device supports the four data units described below:
Coding (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
(
→ section "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 indicates that the pressure reading is within a valid range. This
means that the following conditions are fulfilled:
• The gauge is in the EXECUTING status (Device Block, ID 25)
• The exception status contains no manufacturer warning or alarm
• The transducer block contains no sensor alarm (ID 103)
If this value is set to zero, the pressure reading is not valid. In such a
case, check the Status Extension (ID 102, Transducer Block) to find out
whether the measured value is out of the specified measuring range
(overrange or underrange mode).
8.2.4 Data Type (ID 21)
8.2.5 Data Unit (ID 22)
8.2.6 Reading Valid (ID 23)