INFICON PSG55x ATM to Medium Vacuum Gauge (Profibus) - Manual (Page 35)

tira56e1 (2010-02) PxG55x.cp
35
Byte Name Structure Data Type Bytes Access Store
0 Adjust
Command
Simple UINT8 1 1_R/W
2_R/W
N
1 Target Value Simple *) 1 1_R/W
2_R/W
N
*) According to data type value (ID 21)
Adjust Command Name Description
0 Zero Adjust Used to calibrate diaphragm zero pressure
value. A target value has not to been used.
1…255 Reserved Reserved, no action
Target value Description
– Not available
To perform the Zero Adjust pump down to a value 2 decades below the minimum
pressure range of the gauge and then start the Zero Adjust Service.
The Block Type ID Parameter contains an ID which describes the block type. The
block type ID of the "Sensor Analog Input Function Block" is set to "2". The other
defined block types are listed in Appendix B.
The process value contains the measurement value of the Diaphragm Gauge
transducer instance (CDG), transformed on the basis of the chosen data unit. If the
device is not in state EXECUTING (ID 25, Device Block), the Process value is set
to the value specified by the Safe State (ID 39). This could be the Safe Value, Last
Value, Full Scale, Zero, device specific, or vendor specific.
Conversion between different Data Units:
p [mbar] = p [Torr] * 1.33322369
p [Torr] = p [mbar] / 1.33322369
p [Pa] = p [Torr] * 133.322369
Conversion between different Data Types:
p [Counts] = 3511 * log (p [mbar] * 2 20 ) + 1
p [mbar] = 10 ((p [Counts] - 1) / 3511) / 2 20
This parameter provides the Alarm and Warning State of this block instance.
Because Alarm and Warning Trip Points are not implemented, this value is always
"0".
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
(default)
8.1.1 Analog Input Block
Adjust Command
(ID 15)
Zero adjust algorithm
8.1.2 Block Type ID (ID 16)
8.1.3 Process Value (ID 19)
8.1.4 Status (ID 20)
8.1.5 Data Type (ID 21)