Object Structure
18
17200138_002_C0 – (2016-10) –
Leybold
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 transmitter, 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.
2.4.2 Instance Attributes
Four 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.
2.4.2.1 Instance Attributes of Instance 1
Pirani Instance
Following is the Instance 1 with the subclass extension of the heat transfer
vacuum gauge (pirani gauge) part of the ITR 200 SD. This instance is used to
provide control and status information for the Pirani gauge part of the ITR 200 SD.
Attr.
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 specified 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 Ζ 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, calibrated
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
ID 96 Number of Gauges
ID 95 Active Instance
Number
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