INFICON PSG55x ATM to Medium Vacuum Gauge (Profibus) - Manual (Page 14)

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tira56e1 (2010-02) PxG55x.cp
4 Data Exchange Mode
The reading and writing operations defined in Profibus are based on a slot index
address scheme. In PxG55x, all device functions are organized in the following
blocks:
• Device
block.
Describes all organizational parameters of the gauge (serial number, manu-
facturer, software version, …)
• OneOfN Analog Input Function Block.
Used to determine which function/transducer block parameter set is mapped
into the corresponding block address space.
• Sensor Analog Input Function Block.
Describes the function of the pressure presentation.
• OneOfN Vacuum Gauge Transducer Block
• Transducer
Block.
Describes the physical interface between the gauge and the process.
• Trip Point Function Block.
Used to model the action of the trip point relays.
• Discrete Output Function Block.
Used to control the digital outputs (Trip Function Relays).
Each block is assigned to a separate slot as shown in the table below.
Slot ID Block, if OneOfN Channel Instance … ( → 43)
… Selector = 1 … Selector = 2 … Selector = 3
0 Device Block
1 OneOfN Analog Input Function Block
Analog Input Function
Block 1 (CDG)
Analog Input Function
Block 2 (Pirani)
Analog Input Function
Block 3 (ATM)
OneOfN Vacuum Gauge Transducer Block
CDG Transducer
Block
Pirani Transducer
Block
ATM Transducer
Block
2 Trip Point Function Block 1
3 Trip Point Function Block 2
4 Discrete Output Function Block 1
5 Discrete Output Function Block 2
Slot ID Block, if OneOfN Channel Instance … ( → 43)
… Selector = 1
0 Device Block
1 OneOfN Analog Input Function Block
Analog Input Function Block (Pirani)
OneOfN Vacuum Gauge Transducer Block
Pirani Transducer Block
2 Trip Point Function Block 1
3 Trip Point Function Block 2
4 Discrete Output Function Block 1
5 Discrete Output Function Block 2
There are 254 indices per slot. The indices can have a width of 255 bytes.
All values that can be accessed via Profibus have to be mirrored to one of these
slots/indices.
The parameters are generally numbered in ascending order, starting with index 16.
Services such as "Zero Adjust" are numbered in descending order, starting with
index 15.
4.1 Acyclic Data Trans-
mission with Profibus
DPV1 Functionality
Block, slot and
index assignment
PCG55x
PSG55x