IFM Electronic CR0403 Programming Manual page 221

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Glossary of Terms
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PDU
PDU = Protocol Data Unit.
The PDU is an item of the →CAN protocol →SAE J1939. PDU indicates a part of the destination or
source address.
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PES
Programmable Electronic System ...
• for control, protection or monitoring,
• dependent for its operation on one or more programmable electronic devices,
• including all elements of the system such as input and output devices.
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PGN
PGN = Parameter Group Number
PGN = PDU format (PF) + PDU source (PS)
The parameter group number is an item of the →CAN protocol →SAE J1939. PGN collects the
address parts PF and PS.
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Pictogram
Pictograms are figurative symbols which convey information by a simplified graphic representation.
What do the symbols and formats mean?
(→ chapter
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PID controller
The PID controller (proportional–integral–derivative controller) consists of the following parts:
• P = proportional part
• I = integral part
• D = differential part (but not for the controller CR04nn, CR253n).
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PLC configuration
Part of the CODESYS user interface.
► The programmer tells the programming system which hardware is to be programmed.
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CODESYS loads the corresponding libraries.
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Reading and writing the periphery states (inputs/outputs) is possible.
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Pre-Op
Pre-Op = PRE-OPERATIONAL mode.
Operating status of a CANopen participant. After application of the supply voltage each participant
automatically passes into this state. In the CANopen network only →SDOs and →NMT commands
can be transferred in this mode but no process data.
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Process image
Process image is the status of the inputs and outputs the PLC operates with within one →cycle.
• At the beginning of the cycle the PLC reads the conditions of all inputs into the process image.
During the cycle the PLC cannot detect changes to the inputs.
• During the cycle the outputs are only changed virtually (in the process image).
• At the end of the cycle the PLC writes the virtual output states to the real outputs.
BasicController (CR0403) Runtime System V03.02
(→ page 6))
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2015-04-01