INFICON BCG450-SD ATM to Ultra-High Vacuum Triple Gauge (DeviceNet) - Manual (Page 21)

tira40e1 (2005-04) BCG450SDv1.cp
21
Attribute
ID
Access
Rule
NV/
V Name DeviceNet
Data Type Description of Attribute Semantics of Values
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 Identifies the subset of
additional attributes, serv-
ices and behaviors for hot
cathode ion gauges 5
Hot Cathode Ion Gauge
100 Get NV State
Emission
Control
Mode USINT Represents the state ac-
cording the service Set
Control Mode 0 = Auto
1 = Manual
→ Instance 1
An S-Analog Sensor object instance derives a reading from a physical analog sen-
sor. 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:
Counts = [ log
10
(pressure) + k ] × 2000
where: k
mbar
= 12.5
k
Torr
= 12.624903
k
Pa
= 10.5
→ Instance 1
→ Instance 1
16 Bits are used as sensor faults . Sensor Alarm Byte 0 is mapped to the Exception
Detail Alarm 4, Sensor Alarm Byte 1 ismapped to the Exception Detail Alarm 5.
Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Sensor Alarm Byte 0 0 0 0 0 0 0 0 0
Sensor Alarm Byte 1
0 0 0 0 0 0
Electronics
Failure
0
16 Bits are used as sensor warnings. Sensor warning Byte 0 is mapped to the
Exception Detail Warning 5, Sensor warning Byte 0 is mapped to the Exception
Detail Warning 6.
Data Component Bit 7 Bit 6 Bit 5 Bit 4 Bit 3 Bit 2 Bit 1 Bit 0
Sensor Warning Byte 0 0 0 0 0 0 0 0 0
Sensor Warning Byte 1
0 0 0 0
Pressure
too high for
degas
0 0 0
The bit "Pressure too high for degas" will be set if the pressure is above
7.2×10
-6
mbar when a degas service is requested. The bit will be reset when the
pressure is below 7.2×10 -6 mbar.
2.4.2.4 Semantics of S-Analog
Sensor Instance 2
Data Type
Value
Safe State
Safe Value
Sensor Alarm
Sensor Warning