INFICON PSG55x ATM to Medium Vacuum Gauge (Profibus) - Manual (Page 22)

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tira56e1 (2010-02) PxG55x.cp
6 Block Model
Data to the PxG55x can be transmitted by means of a number of communication
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 configuration 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 PxG55x, all functions that are made available by the gauge via Profibus are
organized in blocks. Access to the individual parameters of the blocks is possible
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 PxG55x 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). See chapter 7.
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.
• Analog Input Function Block (CDG).
→  34
• Analog Input Function Block (Pirani).
→  37
• Analog Input Function Block (ATM).
→  40
• OneOfN Analog Input Function Block.
→  43
• Discrete Output Function Block (Relay 1 and Relay 2).
→  44
• Trip Point Function Block (Relay 1 and Relay 2).
→  46
Transducer Block The physical, process specific functions or interfaces between
the PxG55x and the process are represented in transducer
blocks.
The following transducer blocks are implemented:
• Capacitance Diaphragm Gauge (CDG) Transducer Block.
→  50
• Heat Transfer Vacuum Gauge (Pirani) Transducer Block
→  51
• Atmosphere Pressure Sensor (ATM) Transducer Block
→  52
• OneOfN Vacuum Gauge Transducer Block
→  53
6.1 Block types