INFICON BCG450-SP ATM to Ultra-High Vacuum Triple Gauge (Profibus) - Manual (Page 12)

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tira41e1 (2005-06) BCG450SPv1.cp
3 Block Model
Data to the BCG450-SP can be transmitted by means of a number of communica-
tion protocols and corresponding masters. Profibus defines a master class 1 as
normal control unit of the slave (typically a PLC) and a master class 2 as configura-
tion and service unit. The following communication protocols are defined according
to the Profibus DPV1 standard.
MS0 Cyclic data traffic between master class 1 and slave
MS1 Acyclic data traffic between master class 1 and slave
MS2 Acyclic data traffic between master class 2 and slave
In the BCG450-SP, all functions that are made available by the gauge via Profibus
are organized in blocks. Access to the individual parameters of the blocks is possi-
ble via acyclic services or, for byte, integer and float values, also in cyclic data
traffic via the parameter channel.
The following block types are defined in the gauge.
Device Block The Device Block contains all data that are required for de-
scribing the device and handling its state (status of Device
State Machine).
Transducer Block The physical, process specific functions or interfaces between
the BCG450-SP and the process such as current and voltage
values are represented in transducer blocks.
The following transducer blocks are implemented:
• One of N Vacuum Gauge Transducer Block
• Heat Transfer Vacuum Gauge Transducer Block (Pirani)
• Hot Cathode Ion Gauge Transducer Block (BA)
• Diaphragm Gauge Transducer Block (CDG)
Function Block Application specific values such as pressure values that result
from or can be calculated from the values of the transducer
block are represented in the function blocks.
• One of N Analog Input Function Block
• Analog Input Function Block, Instance 1, Instance 2,
Instance 3, Instance 4, Instance 5, Instance 6.
Block types