INFICON HPG400-SP ATM to High-Vacuum Gauge (Profibus) - Manual (Page 24)

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tira36e1-a (0310) BPG/HPG400 v1.cp
ID Name 1) Structure Data type Bytes Access Store
15 AI Block Adjust
Command
Simple Unsigned8 1 1/2_W -
16 Block Type Simple Octet string 4 2_R N
46 Channel Instance
Selector
Simple Unsigned8 1 1/2_R/W N
47 PV Selector Simple Unsigned8 1 0_XI 1/2_R D
1) The above parameters are described below.
This service is used for adjusting the gauge at atmospheric pressure ( → [1], [3]
for BPG400-SP and [4], [6] for HPG400-SP). For this purpose, the value "1" has
to be transmitted.
The value of the Block Type ID is "3" ( → table in Appendix A).
The gauge has two instances of the Analog Input Function Block and two instances
of the Vacuum Gauge Transducer Block, or one instance of each block per
measuring systems (Pirani and BA/HP). There are two additional instances for
describing the switching functions (
→ section "Analog Sensor Input Function
Block", Instances 3 and 4).
However, there is only one address range for both, querying and setting the corre-
sponding parameters. The Parameter Channel Instance Selector is used for de-
fining the parameters that are written into the address range.
If the Parameter Channel Instance Selector is set to "1", the attributes of Instance 1
are mapped into that address range and can be written or read by addressing
Slot
⇒ Instance ⇒ Parameter-ID.
The PV Selector is determined by the gauge and defines the Analog Input Function
Block Instance from which the measured value is copied into the cyclic output data
telegrams. Therefore, the value output in the cyclic data is always the measured
value of the active instance, i.e. the one that is currently measuring. While the
gauge is measuring in the BA/HP range, the measured value of the ionization
vacuum meter is output in the cyclic data and while the gauge is measuring in the
Pirani range, the measured value of the Pirani is output.
The measured values of Instances 3 and 4 (thresholds of the switching
functions) are not output in the cyclic data.
The pressure ranges, in which measurement is performed either by the Pirani
measuring part or by the BA/HP measuring part, and which are thus called "active",
are indicated below:
Pressure [mbar] PV Selector
5.5×10 -3 < p ≤ Overrange 1) Pirani (=1)
5×10 -10 < p < 5.5×10 -3 BA (=2)
1) Overrange means pressure values > 1000 mbar.
The activation value of the emission of the HPG400-SP can be defined
via a switch on the gauge (
→ [4], [6]). The selected value is called
"p_active_threshold". The activation value of the emission can be read
with the parameter ID 202 "Emission Switch ON Switch" in the Device
Block.
Pressure [mbar] PV Selector
p_active_threshold < p < Overrange 1) Pirani (=1)
Underrange ≤ p < p_active_threshold HP (=2)
1) Overrange means pressure values > 1000 mbar.
3.2.1 One Of N Analog Input
Function Block / SLOT 1
3.2.1.1 AI Block Adjust Command
(Adjustment at Atmo-
spheric Pressure)
3.2.1.2 Block Type
3.2.1.3 Channel Instance Selector
3.2.1.4 PV Selector
Measuring range
BPG-400-SP
Measuring range
HPG-400-SP