Beckhoff KL3201 Manuel d'utilisateur télécharger pdf (Page 20)

18 KL3201, KL3202 and KL3204

Terminal´s

64 words

Control-/

status byte

User data

K-Bus

If control bit 7=0: input/output

If control bit 7=1:

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: here, an unused (reserved) data byte is

automatically inserted after the control or status byte, and the register

value is therefore placed on a word boundary).

Example 1 Reading of register 8 in the BK2000 with a KL3202 and the end terminal:

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

Byte

Byte 3 Byte 2 Byte 1 Byte 0

Name

DataOUT 1 DataOUT 0 Not used Control byte

Value

0xXX 0xXX 0xXX 0x88

the terminal returns the following type identifier (0x0C82 corresponds to

unsigned integer 3202).

Byte

Byte 3 Byte 2 Byte 1 Byte 0

Name

DataIN 1 DataIN 0 Not used Status byte

Value

0x0C 0x82 0x00 0x88

Example 2 Writing of register 31 in the BK2000 with an intelligent terminal and the end

terminal:

If the following bytes (code word) are transferred from the control to the

terminal,

Byte

Byte 3 Byte 2 Byte 1 Byte 0

Name

DataOUT 1 DataOUT 0 Not used Control byte

Value

0x12 0x35 0xXX 0xDF

the code word is set, and the terminal returns the register address with bit

7 for register access as acknowledgement.

Byte

Byte 3 Byte 2 Byte 1 Byte 0

Name

DataIN 1 DataIN 0 Not used Status byte

Value

0x00 0x00 0x00 0x9F

1 2 ... 15 16 17 18 19 20 21 22 23 24 25

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Beckhoff KL3201 Manuel d'utilisateur Page 20

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