Control And Status Bytes - Beckhoff KL3356 Documentation

Access from the user program
reserved: This byte is assigned to the process data memory, although it is not used.
DataOUT2
The process data word DataOUT2 is not used and is not displayed by the TwinCAT System Man-
ager.
5.3

Control and status bytes

Register communication
Control byte 1 (for register communication)
Control byte 1 (CB1) is located in the output image [} 36], and is transmitted from the controller to the
terminal.
Bit CB1.7 CB1.6
Name RegAccess R/W
Key
Bit Name
CB1.7 RegAccess
CB1.6 R/W
CB1.5 to CB1.0 Reg. no.
Status byte 1 (for register communication)
The status byte 1 (SB1) is located in the input image [} 36] and is transmitted from terminal to the controller.
Bit SB1.7 SB1.6
Name RegAccess R/W
Using control and status bytes
In contrast to other types of terminal, the process data provided when using a KL3356 is valid even
during register communication!
The KL3356 uses
• control byte 0 and status byte 0 exclusively for register communication
• control byte 1 and status byte 1 exclusively for process data mode
Key
Bit Name
SB1.7 RegAccess
SB1.6 R
SB1.5 to SB1.0 Reg. no.
38
CB1.5 CB1.4
Reg. no.
Description
1 Register communication switched on
bin
0 Read access
bin
1 Write access
bin
Register number:
Enter the number of the register [} 41] that you
- want to read with input data word DataIN1 [} 36] or
- want to write with output data word DataOUT1 [} 36].
SB1.5 SB1.4
Reg. no.
Description
1 Acknowledgment for register access
bin
0 Read access
bin
Number of the register that was read or written.
Version: 2.3.0
CB1.3 CB1.2
SB1.3 SB1.2
CB1.1 CB1.0
SB1.1 SB1.0
KL3356