INFICON BCG450-SP ATM to Ultra-High Vacuum Triple Gauge (Profibus) User Manual
Page 39
tira41e1 (2005-06) BCG450SPv1.cp
39
This service is used for activating the Degas mode via Profibus.
Byte Name
Structure Data type
Bytes
Access
0
State Command
Simple
Unsigned8
2
1
State Command
Data Field
Simple
Unsigned8
1
2
Value
Simple
Unsigned8
1
State
Command
Name
Description
0
Inactive
No action
1
Set Degas
State
Activates/deactivates the Degas mode
This service is used for activating/deactivating the
Degas mode (p < 7.2
×10
-6
mbar).
If the Degas mode has not been deactivated with
Degas Off before, it is automatically turned off after
3 minutes.
The Degas State can only be changed if p < Degas
On Limit, otherwise the command returns the error
“Object State Conflict“.
The State Command Data Field Value can have the
following values:
0
Degas Off
1
Degas On
3
Set
Emission
State
Turns the emission ON or OFF according to the target
value
Target Value: 0
⇒ Switch emission OFF
Target Value: 1
⇒ Switch emission ON
128
Emission
User Mode
The device supports two modes :
Automatic Mode
Emission is switched on or off by the integrated Pirani
automatically.
If the emission is switched on and is then switched off
manually, the emission will be switched on again only
if the pressure rises above the 3.2
×10
-2
mbar and then
drops below 2.4
×10
-2
mbar.
Manual Mode
Emission is switched on or off by the command "Set
Emission State"
• If during run time the pressure exceeds 3.2×10
-2
mbar, the triple gauge switches off the emission
automatically. The measurement value equals the
Pirani value.
• If the emission is switched off by the user while the
pressure is still in Ioni range, the measurement
value equals the Pirani value. There is no auto-
matic change to the BA range by the BCG450.
Target Value:
0
⇒ sets Manual Mode
1
⇒ sets Automatic Mode
3.3.3.9 Hot Cathode Block State
Command