LEYBOLD DeviceNet ITR 200 D - Common Services; Object-Specific Services on Instance 1; Pirani

Object Structure
17200138_002_C0 – (2016-10) –
 Leybold
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The setpoint is available in the actual pressure unit and data type. If the pressure
unit "Counts" is set, use the following formula for the conversion from Counts to
pressure:
p
mbar
= 10
Counts / 2000 – k
where: k
mba
r
= 12.5
k
Pa
= 10.5
k
Tor
r
= 12.624903
The relation between setpoint and voltage is:
p
mbar
= 10
(U – 7.75) / 0.75 + c
where: c
mba
r
= 0
c
Pa
= 2
c
Tor
r
= -0.125
The setpoints are only activated, if the pressure is below 100 mbar,
therefore a setpoint above 100 mbar can not be realised.
2.4.3 Common Services
The S-Analog Sensor Object provides the following Common Services:
Service Code Service Name Description of Service
0E
h
Get_Attribute_Single Returns the contents of the specified attribute.
10
h
Set_Attribute_Single Modifies an attribute value.
2.4.4 Object-Specific Services on Instance 1 / Pirani
Service Code Service Name Description of Service
4C
h
Full Scale Adjust Performs a Full Scale Adjust for the Pirani
There are no state transitions associated with the invocation of this service. It is,
therefore, incumbent upon the user to establish the device into the desired con-
figuration prior to, and during the execution of this service. This will generally in-
volve exposing the sensor to a known environment and treating the values read
during execution of the services accordingly.
A success service response indicates that the service was accepted and the ap-
plication process started.
To perform the Full Scale Adjust Request vent the transmitter to atmosphere and
then start the Full Scale Adjust Service with a target value as defined below.
Full Scale Adjust Algorithm