Process image example

The following examples with the BK1120 illustrates the process image of a Bus Terminal block.

Process image example 1:
Configuration example for explaining the process image

The Bus Terminal block shown in the example consists of a Bus Coupler with attached KL2012, KL1408, KL3062, KL1104, KL1408 and KL9010 (see image). For complex mapping with Word alignment (factory settings) all non-digital terminals are shown in the process input and output image. Please refer to the relevant terminal documentation regarding the mapping details. The non-digital terminals are mapped first, followed by the digital terminals. The first 16 bits of the process image are reserved for the status word (process input image) and the control word (process output image).

Process input image

The status word (SW) is located in the output process image, and is transmitted from terminal to the controller.

Word-Offset

High byte

Low byte

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

0

Status

 

K-bus
overr.

Outputs
disabled

no valid
output
data

no valid
input
data

 

Config.
Error

K-bus
Error

1

KL3062 (non-digital)

Dummy for Word alignment

Status byte channel 1

2

Process data channel 1

3

Dummy for Word alignment

Status byte channel 2

4

Process data channel 2

5

Digital terminals

KL1408 (2)

KL1104

KL1408 (1)

6

 

 

KL1408 (2)

Process output image

The control word (CW) is located in the output process image, and is transmitted from the controller to the terminal.

Word-Offset

High byte

Low byte

15

14

13

12

11

10

9

8

7

6

5

4

3

2

1

0

0

Control

 

Show
K-bus
overrun

Disable
Outputs

 

1

KL3062 (non-digital)

Dummy for Word alignment

Control byte channel 1

2

Register communication data channel 1

3

Dummy for Word alignment

Control byte channel 2

4

Register communication data channel 2

5

 

Digital terminals

 

 

KL2012