3 control und status byte – BECKHOFF KL6071 User Manual
Page 9
Terminal configuration
KL6071
7
3.3 Control und Status Byte
Control byte during process data exchange
The control byte is transmitted from the controller to the terminal. It can be
used
•
during process data exchange (REG = 0
bin
) or
•
in register mode (REG = 1
bin
).
Bit
7
6
5
4
3
2
1
0
Name
REG=0
0
0
A4
A3
A2
A1
A0
Key
Bit
Name
Comment
7
REG
0 for Process data mode
6
0
reserved
5
0
reserved
4-0
A4-A0
Offset from where reading or writing is done.
The offset is calculated as follows:
(A4…A0) x 5
Status byte during process data exchange
The status byte is transferred from the terminal to the control system. It
acknowledges the bits of the control byte.
Bit
7
6
5
4
3
2
1
0
Name
REG=0
0
CS_ST
A4
A3
A2
A1
A0
Key
Bit
Name
Comment
7
REG
0 for Process data mode
6
0
reserved
5
CS_ST
State of the CS Input
4-0
A4-0
Address bits 0 to 4