Object Structure
24
17200138_002_C0 – (2016-10) –
Leybold
2.4.2.5 Instance Attributes of Instance 21 / Setpoint A
(Instance 22 / Setpoint B)
Attr.
ID
Access
rule
NV/
V
Name DeviceNet
data type
Description of
Attribute
Semantics of Values
3 Set/
Cond.
→ In-
stance 1
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 Get NV Data
Units
UINT Determines the
Units context of
Value and all
related 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
6 Get V Value INT or
specified
by Data
Type
The value of the
Setpoint A (Set-
point B) relay.
7 Get V Status BYTE Alarm and War-
ning State of this
object instance
→ "Semantics" section
below.
Behavior as Trip Point
LOW
A bit mapped byte which indicates the Alarm and Warning Exception status of the
object instance. The following definition applies:
Bit Definition
0 High Alarm Exception: 0 = cleared 1 = set
1 Low Alarm Exception: 0 = cleared 1 = set
2 High Warning Exception: 0 = cleared 1 = set
3 Low Warning Exception: 0 = cleared 1 = set
4 Reserved
5 Reserved
6 Reserved
7 Reserved
If the pressure (attribute 6, instance 1 and 2) decreases below the Set Point value
(attribute 6, instance 21 and 22) an alarm or warning exception condition will be
generated. The hysteresis is set to 10%.
For example: A SET Point value of 100 will result in an exception condition being
set when the value is below 100 and cleared when the value increases above 110.
The setpoints can only be read by DeviceNet. It is not possible to set the
values or to influence the state of the relays by DeviceNet. Even if the
device is not allocated, the relay status is set corresponding to the
voltage adjusted by the two setpoint potentiometers.
Only in case of a microcontroller RESET (for example reset on Identity
Object), the relays will be reset too.
Status
Set Points
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