INFICON HPG400-SD ATM to Ultra-High Vacuum Gauge (DeviceNet) - Manual (Page 22)

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tira03e1-b (0310) BPG/HPG400-SDv1.cp
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
→ Instance 1
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, Hot cathode measuring range 8333 < counts < 24333:
Counts = [ log
10
(pressure) + k ] × 2666.665
where: k
mbar
= 9.125
k
Torr
= 9.249903
k
Pa
= 7.125
→ 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 0 0
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