Beckhoff BC8050 User Manual

RS232 - Interface
BC8050 und BC815076 Version: 3.0.0
Byte Description Range of values
0 Start ID "p" (0 x 70 hex)
1 Number of process data output words 0..255
2 Message Ident 0..255
3 Multipoint address 0..99 for BK8x00
0..69 for IP/ILxxxx-B8x0
4
Status byte [}76]
0..255
5 + 2 x n
n = 0...125
Process data output
Low byte
0..255
6 + 2 x n Process data output
High byte
0..255
7 + 2 x n +1 Checksum 0..255
Start ID
The start ID consists of one byte. It identifies the start of a data packet.
Number of process data output words
The number of process data output words specifies the size of the output process image of the addressed
Bus Coupler/Fieldbus Box in words. If the number of process image bytes is odd it must be rounded up.
Enter zero if only the process input data of the Bus Coupler/Fieldbus Box are to be read.
Message Ident
The message Ident is a (freely selectable) value returned by the receiver in the response string, so that the
sender can correlate received and sent strings.
Multipoint address
The multipoint address specifies the receiver. The address value must be unequal 0, since 0 is the master
address. For Fieldbus Boxes please note that addresses greater than 69 are not permitted.
Status byte (SB)
Bit Meaning
SB.0 1
bin
Error in the data communication with the Bus Terminals/
extension modules.
SB.1 1
bin
Configuration error
SB.2 - reserved
SB.3 - reserved
SB.4 1
bin
Invalid process data output length: The number of process
output words received is unequal the physically present data
length.
SB.5 - reserved
SB.6 - reserved
SB.7 - reserved
Process data output
The process data inputs are entered as data words in Intel format.
Checksum
The checksum is formed by adding up the contents of the individual bytes (total request string, without
checksum byte). Any overflow is not taken into account.

Beckhoff BC8050 Specifications

General

Brand	Beckhoff
Model	BC8050
Category	Controller
Language	English