Beckhoff KL1501 User Manual download pdf (Page 14)

Terminal configuration

12 KL1501

3.4 Register communication with KL1501

process data transfer

Bit 7=1: register mode

When bit 7 of the control byte is set, the first two bytes of the user data are

not used for process data transfer, but are written into or read out of the

terminal’s register.

Bit 6=0: read

Bit 6=1: write

In bit 6 of the control byte, you define whether a register is to be read or

written. When bit 6 is not set, a register is read without modification. The

value can be taken from the input process image.

When bit 6 is set, the user data is written into a register. The operation is

concluded as soon as the status byte in the input process image has

supplied an acknowledgement (see examples).

Bits 0 to 5: address The address of the register to be addressed is entered in bits 0 to 5 of the

control byte.

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

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 to the rule: here, an unused data byte is

inserted after the control or status byte, thus setting the register value to a

word limit).

1 2 ... 9 10 11 12 13 14 15 16 17 18 19

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Beckhoff KL1501 User Manual Page 14

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