Access From The User Program; Control And Status Bytes; Process Data Mode - Beckhoff KL3214 Documentation

Access from the user program

5 Access from the user program
Different operating modes or functionalities may be set for the complex terminals. The General Description of
Registers explains those register contents that are the same for all complex terminals.
The terminal-specific registers are explained in the following section.
Access to the internal terminal registers is described in the Register Communication section.
5.1

Control and status bytes

5.1.1

Process data mode

Control byte (for process data mode)
The control byte (CB) is located in the output image, and is transmitted from the controller to the terminal.
Bit CB.7 CB.6
Name RegAccess R/W
Bit Name Description
CB.7 RegAccess 0
bin
CB.6 R/W 0
bin
1
bin
CB.5 - reserved
CB.4 - reserved
CB.3 - reserved
CB.2 - reserved
CB.1 - reserved
CB.0 - reserved
Status byte (for process data mode)
The status byte (SB) is located in the input image, and is transmitted from terminal to the controller.
Bit SB.7 SB.6
Name RegAccess Error
Bit Name Description
SB.7 RegAccess 0
bin
SB.6 Error 1
bin
SB.5 - reserved
SB.4 - reserved
SB.3 - reserved
SB.2 - reserved
SB.1 overrange 1
bin
SB.0 underrange 1
bin
30
CB.5 CB.4
- -
Register communication off (process data mode)
Read access
Write access
SB.5 SB.4
- -
Process data mode switched on
Measuring range exceeded, overrange or underrange; the Error LED lights
up or conversion error or invalid measuring range
Electrical measuring range exceeded
Electrical measuring range undershot
Version: 1.2.0
CB.3 CB.2
- -
SB.3 SB.2
- -
CB.1 CB.0
- -
SB.1 SB.0
overrange underrange
KL3214