BECKHOFF KL6051 User Manual

Page 12

KL6051

Control byte in the
register mode

MSB

REG=1

W/R

REG = 0 : Process data transfer
REG = 1 : Access to register structure
W/R = 0 : Read register
W/R = 1 : Write register
A5..A0 = Register address
A total of 64 registers can be addressed with the addresses A5....A0.

Terminal´s

register set

64 words

Control-/

status byte

User data

K-Bus

If control bit 7=0: input/output

If control bit 7=1:

register-

configuration

C/S-bit 7

If control bit 7=1:

adress in the control bit 0-5

If control bit 6=0: read

If control bit 6=1: write

Complex bus terminal

To the bus coupler

2 or mors bytes

The control or status byte occupies the lowest address of a logical channel.
The corresponding register values are located in the following 2 data bytes
(the BK2000 is an exception to the rule: here, an unused data byte is inser-
ted after the control or status byte, thus setting the register value to a word
limit).

Example

Reading register 8 in the BK2000 with a Kl3022 and the end terminal.

If the following bytes are transferred from the controller to the terminal,

Byte0

Control

Byte1

Not used

Byte2

Data OUT, high byte

Byte3

Data OUT, low byte

0x88

0xXX

the terminal returns the following type designation (0x0BCE corresponds to
the unsigned integer 3022).

Byte0

Status

Byte1

Not used

Byte2

Data IN, high byte

Byte3

Data IN, low byte

0x88

0x00

0x0B

0xCE