User guide

26 tira47e1 (2005-08) BPG402SPv1.cp
When the gauge is not in the EXECUTING status (ID 25, Device Block) or if there
is a device error, a value defined by Safe State is output as pressure value:
Safe State Coding PV behavior
Zero 0 The Process Value (measured value ID 19) is set
to 0.
Full Scale 1 The Process Value (measured value ID 19) is set
to the full scale value (ID 24).
Hold Last Value 2 The Process Value is set to the last valid value
obtained in the EXECUTING status.
Use Safe Value 3 The Process Value (measured value ID 19) is set
to the Safe Value (ID 40).
The Safe Value is the value output with the Process Value parameter (ID 19) when
an error occurs or the gauge goes to the NOT EXECUTING status. If this value is
set to zero, it will remain on zero when the data unit is changed.
Overrange is the highest valid measured value at which Reading Valid is still
on "1".
Pressure unit Overrange
COUNTS 31000
Torr 750.06168
mTorr (Micron) 750061.68
mbar 1000
Pascal 100000
Underrange is the lowest valid measured value at which Reading Valid is still
on "1".
Pressure unit Underrange
COUNTS 20480
Torr 4.12534×10
-3
mTorr (Micron) 4.12534
mbar 5.5×10
-3
Pascal 0.55
The parameter controls zero point and fullscale adjustments of the Pirani.
Byte Name Structure Data type Bytes Access
0 State Command Simple UINT8 1 1/2_W
State Command Name Meaning
0 Zero Adjust Pirani zero point adjustment
1 Gain Adjust Pirani fullscale adjustment
3.2.2.7 Safe State ID 39
3.2.2.8 Safe Value ID 40
3.2.2.9 Overrange ID 44
3.2.2.10 Underrange ID 45
3.2.2.11 AI Block Adjust
Command (Pirani)
ID 15