INFICON BPG402-SP ATM to Ultra-High Vacuum Gauge (Profibus) - Manual (Page 36)

36
tira47e1 (2005-08) BPG402SPv1.cp
This service is used for activating degas and emission modes via Profibus.
ID Name Structure Data type Bytes Access Range
14 Hot Cathode
Block State
Command Rec → below 2 1/2_W
Byte 0 Transition
Command Simple UINT8 1 → below
Byte 1 Value Simple UINT8 1 → below
Transition
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 <7.2
×10 -6
mbar, otherwise the command returns the
error "Object State Conflict".
The Transition 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
0
⇒ Switch emission Off
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 emission is switched off automatically.
The measurement value equals the Pirani value.
• If the emission is switched off by the user while the
pressure is still in BA range, the measurement
value equals the Pirani value. There is no auto-
matic change to the BA range by the BPG402.
0
⇒ sets Manual Mode
1
⇒ sets Automatic Mode
3.3.3.12 Hot Cathode Block State
Command ID 14