Control and status bytes
Channel 1
The control and status bytes for channel 1 are shown below.
Channel 2, channel 3 and channel 4
The control and status bytes of channels 2, 3 and 4 are structured like the control and status byte of channel 1.
Process data mode
Control byte 1 in process data mode
Control byte 1 (CB1) is located in the output image, and is transmitted from the controller to the terminal. In process data mode it has no function.
Bit | CB1.7 | CB1.6 | CB1.5 | CB1.4 | CB1.3 | CB1.2 | CB1.1 | CB1.0 |
Name | RegAccess | - | - | - | - | - | - | - |
Key
Bit | Name | Description | |
|---|---|---|---|
CB1.7 | RegAccess | 0bin | Register communication off (process data mode) |
CB1.6 - CB1.0 | - | 0bin | reserved |
Status byte 1 in process data mode
The status byte 1 (SB1) is located in the input image and is transmitted from terminal to the controller. In process data mode it has no function.
Bit | SB1.7 | SB1.6 | SB1.5 | SB1.4 | SB1.3 | SB1.2 | SB1.1 | SB1.0 |
Name | RegAccess | - | - | - | - | - | - | - |
Key
Bit | Name | Description | |
|---|---|---|---|
SB1.7 | RegAccess | 0bin | Acknowledgment for process data mode |
SB1.6 - SB1.0 | Error | 0bin | reserved |
Register communication
Control byte 1 in register communication
Control byte 1 (CB1) 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. | |||||
Key
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 1 in register communication
The status byte 1 (SB1) 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. | |||||
Key
Bit | Name | Description | |
|---|---|---|---|
SB1.7 | RegAccess | 1bin | Acknowledgment 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. | |