First Steps - Example - Beckhoff BK9105 Documentation

Appendix
6.2

First Steps - Example

Mapping
The BK9105 can be mapped as short integer (byte), integer (word), or double integer (double word).
In the following description it is mapped as double integer!
Process Image
The figure below illustrates the hardware of the Beckhoff node in this example.
The process image table (I/O map) is displayed in double word format below the figure.
In order to properly configure the Ethernet Bridge, the process image of the Beckhoff BK9105 node must be
determined. When the coupler is powered up, it automatically addresses the I/O modules of the node. The
data for complex modules (modules using 2 or more bytes) are mapped first in the process image in the
order of their physical position after the coupler. As such, they start at Double word 3. Following this, the
digital modules are grouped into the next available Integer. The bits are arranged in the order of the modules
location. When the number of digital points exceeds 32 (1-double integer), the coupler automatically starts
the next Double Integer.
Note: The modules can be mapped as Byte, Word, or Double Word. The example below maps them as
Double Word, using 2 digital input cards (KL1104, KL1408), 2 digital output cards (KL2134, KL2408), 1 four
channel analog input card (KL3064), 1 two channel analog output card (KL4002), and 1 High speed counter
card (KL5101).
Fig. 53: Example of a Bus Terminal Block
Input Process Image
• Double Word 0: BK9105 Status
• Double Word 1: Channel 1 KL3064 (High Word) and Status (Low Word)
58 Version: 2.0.0 BK9055 and BK9105