INFICON BPG402-SD ATM to Ultra-High Vacuum Gauge (DeviceNet) User Manual
Page 21
tira46e1 (2004-11) BPG402-SDv1.cp
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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
V
State
Emission
User
Mode
USINT
Represents the state ac-
cording to the service Set
Emission User 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
Pa
=
10.5
k
Torr
=
12.624903
→ Instance 1
→ Instance 1
16 Bits are used as sensor faults . Bit 8
… Bit 16 are mapped to the Exception
Detail Alarm 3, Bit 0
… Bit 7 are mapped to the Exception Detail Alarm 2.
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
Sensor
Filament 2
Failure
Sensor
Filament 1
Failure
Sensor Alarm Byte 1
0
0
0
0
0
0
Electronics
Failure
0
2.4.2.4 Semantics of S-Analog
Sensor Instance 2
Data Type
Value
Safe State
Safe Value
Sensor Alarm