Control and status bytes without diagnosis
This description applies to
- KL2751-0000 / KS2751-0000 with firmware versions lower than 3B
- KL2751-0011 / KS2751-0011 with firmware versions lower than 3B
Process data mode
Control and status byte have no functionality in process data mode.
Register communication
Control byte (for register communication)
The control byte (CB) is located in the output image, and is transmitted from the controller to the terminal.
Bit | CB1.7 | CB1.6 | CB1.5 | CB1.4 | CB1.3 | CB1.2 | CB1.1 | CB1.0 |
Name | RegAccess | R/W | Reg. no. | |||||
Legend
Bit | Name | Description | |
|---|---|---|---|
CB1.7 | RegAccess | 1bin | Register communication switched on |
CB1.6 | R/W | 0bin | Read access |
1bin | Write access | ||
CB1.5 to CB1.0 | Reg. no. | Register number: | |
Status byte (for register communication)
The status byte (SB) is located in the input image, and is transmitted from terminal to the controller.
Bit | SB1.7 | SB1.6 | SB1.5 | SB1.4 | SB1.3 | SB1.2 | SB1.1 | SB1.0 |
Name | RegAccess | R/W | Reg. no. | |||||
Legend
Bit | Name | Description | |
|---|---|---|---|
SB1.7 | RegAccess | 1bin | Acknowledgement for register access |
SB1.6 | R | 0bin | Read access |
SB1.5 to SB1.0 | Reg. no. | Number of the register that was read or written. | |