INFICON BCG450-SD ATM to Ultra-High Vacuum Triple Gauge (DeviceNet) - Manual (Page 24)

24
tira40e1 (2005-04) BCG450SDv1.cp
→ 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 0, Sensor Alarm Byte 1 is mapped to the Exception Detail Alarm 1.
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 Diaphragm
Failure
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 1, Sensor Warning Byte 1 is mapped to the Exception
Detail Warning 2.
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 0 0 Electronics
Warning
0
8 Bits providing the current sensor alarm state of the instance
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 Underrange
Exceeded
Overrange
Exceeded
Reading
Invalid
2.4.2.6 Semantics of S-Analog
Sensor Instance 3
Data Type
Value
Safe State
Safe Value
Sensor Alarm
Sensor Warning
Status Extension