Beckhoff BC8050 User Manual

RS232 - Interface
BC8050 und BC815072 Version: 3.0.0
6.1.1.5.6 Function 16: Writing a number of analog outputs
Function 16 can be used to write a number of analog outputs. The first 2 analog output words are written in
this example. The analog 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.
Example: 4 words - correspond to byte count 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 Modbus RTU Modbus ASCII
Start - frame - - ":" 0x3A
Address 11 0x0B "0B" 0x30, 0x42
Function code 16 0x10 "10" 0x31, 0x30
Start address high 8 0x08 "08" 0x30, 0x38
Start address low 0 0x00 "00" 0x30, 0x30
Length high 0 0x00 "00" 0x30, 0x30
Length low 2 0x02 "02" 0x30, 0x32
Byte Count 4 0x04 "04" 0x30, 0x34
Date 1byte 1 127 0x7F "7F" 0x37, 0x46
Date 1byte 2 255 0xFF "FF" 0x46, 0x46
Date 2byte 1 63 0x3F "3F" 0x33, 0x46
Date 2byte 2 255 0xFF "FF" 0x46, 0x46
Error check, LRC/
CRC
0xCD, 0xE3 "1B" 0x31, 0x42
End - frame t1-t2-t3 CRLF 0x0D, 0x0A
Response
The Bus Coupler/Fieldbus Box responds with the start address and the length of the sent words.
Byte Name Modbus RTU Modbus ASCII
Start - frame - - ":" 0x3A
Address 11 0x0B "0B" 0x30, 0x42
Function code 16 0x10 "10" 0x31, 0x30
Start address high 8 0x08 "08" 0x30, 0x38
Start address low 0 0x00 "00" 0x30, 0x30
Length high 0 0x00 "00" 0x30, 0x30
Length low 2 0x02 "02" 0x30, 0x32
Error check, LRC/
CRC
0x43, 0x02 "DB" 0x44, 0x42
End - frame t1-t2-t3 CRLF 0x0D, 0x0A

Beckhoff BC8050 Specifications

General

Brand	Beckhoff
Model	BC8050
Category	Controller
Language	English