Beckhoff KL4414, Документация

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Access from the user program
KL4414, KL4418, KL4424, KL4428 34 Version: 3.0.0
7.2 Mapping
The Bus Terminals occupy addresses within the process image of the controller. The assignment of process
data (input and output data) and parameterization data (control and status bytes) to the control addresses is
called mapping. The type of mapping depends on:
• the fieldbus system used
• the terminal type
• the parameterization of the Bus Coupler (conditions) such as
◦ compact or full evaluation
◦ Intel or Motorola format
◦ word alignment switched on or off
The Bus Couplers (BKxxxx, LCxxxx) and Bus Terminal Controllers (BCxxxx, BXxxxx) are supplied with
certain default settings. The default setting can be changed with the KS2000 configuration software or with a
master configuration software (e.g. TwinCAT System Manager or ComProfibus).
The following tables show the mapping depending on different conditions. For information about the contents
of the individual bytes please refer to the pages
Process image and Control and status byte .
Compact evaluation
With compact evaluation, the analog output terminals only occupy addresses in the output process image.
Control and status bytes cannot be accessed.
Compact evaluation in Intel format
Default mapping for CANopen, CANCAL, DeviceNet, ControlNet, Modbus, RS232 and RS485 coupler
Address Input data Output data
Conditions Word offset High byte Low byte High byte Low byte
Complete evaluation: no
Motorola format: no
Word alignment: any
0 - - Ch1 D1 Ch1 D0
1 - - Ch2 D1 Ch2 D0
2 - - Ch3 D1 Ch3 D0
3 - - Ch4 D1 Ch4 D0
Compact evaluation in Motorola format
Default mapping for Profibus and Interbus coupler
Address Input data Output data
Conditions Word offset High byte Low byte High byte Low byte
Complete evaluation: no
Motorola format: yes
Word alignment: any
0 - - Ch1 D0 Ch1 D1
1 - - Ch2 D0 Ch2 D1
2 - - Ch3 D0 Ch3 D1
3 - - Ch4 D0 Ch4 D1
Key
Complete evaluation: In addition to the process data, the control and status bytes are also mapped into the address space.
Motorola format: Motorola or Intel format can be set.
Word alignment: In order for the channel address range to commence at a word boundary, empty bytes are inserted into
the process image as appropriate.
Ch n D0: channel n, lower-value data byte
Ch n D1: channel n, higher-value data byte
"-": This byte is not assigned or used by the terminal/module.
Complete evaluation
For complete evaluation, the analog output terminals occupy addresses in the input and output process
image. Control and status bytes can be accessed.