KL4494 - Analog terminal with two input and two output channels, -10 V...+10V

Control and status bytes

 

Channel 1: The control and status bytes for channel 1 are illustrated in the following.

 
 

Channel 2: The control and status bytes of channel 2 have the same structure as the control and status bytes of channel 1.

 
 

Process data mode

 
 

Control byte 1 (CB1) in process data mode
Control byte 1 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 (SB1) in process data mode
The status byte 1 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
Error
LimitValue 2 State
LimitValue 1 State
Overrange
Underrange
 
 

Key

 
Bit
Name
Description
SB1.7
RegAccess
0bin
Acknowledgment for process data mode
SB1.6
Error
1bin
General error bit
SB1.5 - SB1.4
LimitValue 2
State
00bin
Limit value 2 not activated
01bin
Process data less than limit value 2
10bin
Process data greater than limit value 2
11bin
Process data equal limit value 2
SB1.3 - SB1.2
LimitValue 1
State
00bin
Limit value 1 not activated
01bin
Process data less than limit value 1
10bin
Process data greater than limit value 1
11bin
Process data equal limit value 1
SB1.1
Overrange
1bin
Permissible measuring range exceeded
SB1.0
Underrange
1bin
Lower measuring range limit violated
 
 

Register communication

 
 

Control byte 1 (CB1) in register communication

Control byte 1 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:
Enter the number of the register that you
want to read with input data word DataIN1 or
with the output data word DataOUT1
 
 

Status byte 1 (SB1) in register communication

The status byte 1 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.