INFICON HPG400-SD ATM to Ultra-High Vacuum Gauge (DeviceNet) - Manual (Page 18)

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tira03e1-b (0310) BPG/HPG400-SDv1.cp
The device internally modifies this attribute, as required, to identify the S-Analog
Sensor object instance providing the Value member which is copied into the Active
Value for all Input Assemblies and the Alarm/Warning Exception Details for the
S-Device Supervisor object.
The Active Instance Number will be modified based upon the Active Value in order
that the best gauge, corresponding to a given S-Analog Sensor instance, will be
active for the given measurement range.
This attribute is used to determine the size of all Input Assemblies within a node.
Three S-Analog Sensor Instances (Instance 1, Instance 2, Instance 21 and In-
stance 22) are available. Instance 1 represents the physical sensor reading of the
heat transfer vacuum gauge (pressure), Instance 2 represents the physical sensor
reading of the hot cathode ion gauge (pressure).
Instance 21 and Instance 22 represent the value of the Setpoint A and Setpoint B.
Following is the Instance 1 with the subclass extension of the heat transfer vac-
uum gauge (pirani gauge) part of the BPG400-SD. This instance is used to pro-
vide control and status information for the Pirani gauge part of the BPG400-SD.
Attribute
ID
Access Rule NV/
V
Name DeviceNet Data
Type Description of
Attribute Semantics of Values
3 Set /Cond.
→ below
NV Data Type USINT Determines the
Data Type of Value
and all related
attributes as speci-
fied in this table. → "Semantics" section below.
Int
C3
h
[default]
float CA
h
4 Set
→ below
NV Data Units UINT Determines the
Units context of
Value and all re-
lated attributes. Supported Values:
Counts
1001
h
[default]
mbar 1308
h
Torr 1301
h
Pascal 1309
h
5 Get V Reading Valid BOOL Indicates that the
Value attribute
contains a valid
value. 0 = invalid
1 = valid
(invalid: e.g., not warmed up
yet)
6 Get V Value INT or specified
by Data Type Analog input value The corrected, converted, cali-
brated final value of the sensor.
→ "Semantics" section below.
7 Get V Status BYTE Alarm and Warning
State of this object
instance Always zero, because Alarm
and Warning Trip Points are not
implemented
10 Get NV Full Scale INT or specified
by Data Type The Value of Full
Scale for the sen-
sor. The value of attribute Value
corresponding to the Full Scale
calibrated measurement of the
sensor.
[default] = maximum allowable
value for the Data Type
25 Set NV Safe State USINT Specifies the be-
havior for the Value
for states other
than Execute → "Semantics" section below.
[default] = 0
26 Set NV Safe Value INT or specified
by Data Type The Value to be
used for Safe State
= Safe Value → "Semantics" section below.
[default] = 0
32 Get NV Overrange INT or specified
by Data Type Specifies the
highest valid Value The value above which attribute
Reading Valid is set to invalid.
[default] = maximum allowable
value for the Data Type
Active Instance Number
Number of Gauges
2.4.2 Instance Attributes
2.4.2.1 Instance Attributes of
Instance 1
Pirani Instance