Control And Status Bytes; Process Data Mode - Beckhoff KL3444 Documentation

7.3

Control and Status Bytes

Channel 1
The control and status bytes (CB1 and SB1) for channel 1 in the process data mode [} 47] and for register
communication [} 48] are described 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.
7.3.1

Process data mode

Control byte 1 in process data mode
Control byte 1 (CB1) is located in the output image [} 43], and is transmitted from the controller to the
terminal. In process data mode it has no function.
Bit CB1.7
Name RegAccess
Key
Bit Name
CB1.7 RegAccess
CB1.6 ... -
CB1.0
Status byte 1 in process data mode
The status byte 1 (SB1) is located in the input image [} 43] and is transmitted from terminal to the controller.
Bit SB1.7
Name RegAccess
Key
Bit Name
SB1.7 RegAccess
SB1.6 Error
SB1.5 ... LimitValue 2
SB1.4 State
SB1.3 ... LimitValue 1
SB1.2 State
SB1.1 Overrange
SB1.0 Underrange 1
KL3444, KL3448, KL3454 und KL3458
CB1.6 CB1.5 CB1.4
- - -
Description
0 Register communication off (process data mode)
bin
0 reserved
bin
SB1.6 SB1.5 SB1.4
Error LimitValue 2 State
Description
0 Acknowledgment for process data mode
bin
1 General error bit
bin
00 Limit value 2 not enabled
bin
01 Process data less than limit value 2
bin
10 Process data greater than limit value 2
bin
11 Process data equal limit value 2
bin
00 Limit value 1 not enabled
bin
01 Process data less than limit value 1
bin
10 Process data greater than limit value 1
bin
11 Process data equal limit value 1
bin
1 Permissible measuring range exceeded
bin
Lower measuring range limit violated
bin
Version: 3.2.0
Access from the User Program
CB1.3 CB1.2
- -
SB1.3 SB1.2 SB1.1
LimitValue 1 State Overrange
CB1.1 CB1.0
- -
SB1.0
Underrange
47