INFICON HPG400-SD ATM to Ultra-High Vacuum Gauge (DeviceNet) - Manual (Page 19)

tira03e1-b (0310) BPG/HPG400-SDv1.cp
19
Attribute
ID
Access Rule NV/
V
Name DeviceNet Data
Type Description of
Attribute Semantics of Values
33 Get NV Underrange INT or specified
by Data Type Specifies the
lowest valid Value The value below which attribute
Reading Valid is set to invalid.
[default] = minimum allowable
value for the Data Type
94 Get V Sensor Warning Struct of Byte Bit definitions of
Sensor Warnings 0 = [default]
→ "Semantics" section
95 Get V Sensor Alarm Struct of Byte Bit definitions of
Sensor Alarms 0 = [default]
→ "Semantics" section
96 Get V Status Extension BYTE Bit-mapped byte
providing additional
status bits Bit description:
0 Reading Invalid
(Logical Inversion of
Reading Valid)
1 Overrange Exceeded
2 Underrange Exceeded
99 Get NV Subclass UINT Defines a subset of
additional attrib-
utes, services and
behaviors. 02 = Heat Transfer Vacuum
Gauge
All Data Type attributes use the enumerated values integer or float.
→ Appendix A
The Data Type value will be set automatically based upon the first valid I/O con-
nection established by the device.
If no established I/O connections exist, which include an attribute from this object,
then the Data Type attribute is settable provided that the object is in the Idle State.
Note: Using data type integer in combination with a pressure unit (mbar, Torr or Pa)
will obviously not produce reasonable values below 1.
The Data Unit is only settable in the IDLE state.
An S-Analog Sensor object instance derives a reading from a physical analog
sensor. The reading is converted to the data type and units specified for the Value
attribute.
Using Counts and INT the following conversion has to be used:
BPG400-SD:
Counts = [ log
10
(pressure) + k ] × 2000
where: k
mbar
= 12.5
k
Torr
= 12.624903
k
Pa
= 10.5
HPG400-SD:
Pirani gauge measuring range 27000 < counts < 30333
Counts = [ log
10
(pressure) + k ] × 666.665
where: k
mbar
= 42.5
k
Torr
= 42.624903
k
Pa
= 40.5
2.4.2.2 Semantics of S-Analog
Sensor Instance 1
Data Type
Data Unit
Value