INFICON BCG450-SD ATM to Ultra-High Vacuum Triple Gauge (DeviceNet) User Manual
Page 26
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tira40e1 (2005-04) BCG450SDv1.cp
Attribute
ID
Access
Rule
NV/V Name
DeviceNet
Data Type
Description of Attribute
Semantics of Values
3
Set / Con-
ditional:
→
Instance 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 (Setpoint B)
relay.
7
Get
V
Status
BYTE
Alarm and Warning State
of this object instance
→ "Semantics" section below.
Behavior as Trip Point LOW
100
NV
Set
Setpoint
Function
USINT
Defines whether the relay
is controlled by the accor-
ding potentiometer or by
the atmosphere pressure
sensor combined with the
Capacitance Diaphragm
Gauge pressure value.
0 = Setpoint (default)
1 = Atmosphere Control
101
NV
Set
Percentage
of
Atmosphere
1)
USINT
If the pressure value
(active value) is within a
"window" specified by this
attribute from the
atmosphere pressure sen-
sor value, the relay will be
activated. For further
details
→ below.
0 … 140
Example:
1
1%
50
50%
default value = 5%
The upper pressure limit of the
gauge is 1500 mbar. At an
atmosphere pressure above
1000 mbar and a percentage
of atmosphere of 150% the
relay will never be activated.
102
V
Get
Atmosphere
reached
USINT
If the pressure of the
gauge is within a percen-
tage of the atmosphere
pressure this byte has the
value 1. If the pressure is
below this window, the
value is 0.
If the device is in Safe State the value
of this attribute is "0".
1)
Atmospheric pressure threshold (
→ 28).
2.4.2.8 Instance Attributes of
Instance 21 / Setpoint A
(Instance 22 / Setpoint B)