Beckhoff BC9100 User Manual

Fieldbus system
BC9000 and BC9100 73Version: 4.0.0
Response
The Bus Coupler answers with the same telegram.
Byte name Sample
Function code 15
Start address high 0
Start address low 0
Length high 0
Length low 20
7.5.4.10 Preset single register (Function 16)
The Preset multiple register function can be used to write a number of outputs. The first two analog output
words are written in this example. The outputs start at an offset of 0x0800. Here the offset always describes
a word. Offset 0x0003 writes to the fourth word in the output process image. The length indicates the number
of words, and the Byte count is formed from the combination of all the bytes that are to be written.
Sample: 4 words - correspond to a byte count of 8
The data bytes contain the values for the analog outputs. In this example, two words are to be written. The
first word is to receive the value 0x7FFF, and the second word is to receive the value 0x3FFF.
Query
Byte name Sample
Function code 16
Start address high 8
Start address low 0
Length high 0
Length low 2
Byte count 4
Data 1 byte 1 127
Date 1byte 2 255
Date 2byte 1 63
Data 2 byte 2 255
Response
The coupler replies with the start address and the length of the transmitted words.
Byte name Sample
Function code 16
Start address high 8
Start address low 0
Length high 0
Length low 2
7.5.4.11 Read / write registers (Function 23)
A number of analog outputs can be written and a number of analog inputs read with one telegram using the
Read/write registers function. In this example the first two analog output words are written, and the first two
analog inputs are read. The analog outputs start at offset 0x0800, while the inputs start at offset 0x0000.

Beckhoff BC9100 Specifications

General

Brand	Beckhoff
Model	BC9100
Category	Controller
Language	English