Beckhoff KL4494, Руководство пользователя

Страница: 29 / 40

Access from the user program
KL4494 29 Version: 2.0.0
5 Access from the user program
5.1 Process image
In the process image, the KL4494 is represented with 6 bytes of input data and 6 bytes of output data. These
are organized as follows:
Byte offset (without
word alignment) Byte offset (with word
alignment*) Format Input data Output data
0 0 Byte
Status byte ( SB1 [
}
29] ) Control-Byte ( CB1 [
}
29] )
1 2 Word DataIN1 DataOUT1
3 4 Byte
Status byte ( SB2 [
}
29] ) Control byte ( CB2 [
}
29] )
4 6 Word DataIN2 DataOUT2
*) Word alignment: The Bus Coupler places values on even byte addresses
5.2 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 [ } 29] , 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 0
bin
Register communication off (process data mode)
CB1.6 - CB1.0 - 0
bin
reserved
Status byte 1 (SB1) in process data mode
The status byte 1 is located in the input image [
}
29] 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 0
bin
Acknowledgment for process data mode
SB1.6 Error 1
bin
General error bit
SB1.5 - SB1.4 LimitValue 2
State 00
bin
Limit value 2 not activated
01
bin
Process data less than limit value 2
10
bin
Process data greater than limit value 2
11
bin
Process data equal limit value 2
SB1.3 - SB1.2 LimitValue 1
State 00
bin
Limit value 1 not activated
01
bin
Process data less than limit value 1
10
bin
Process data greater than limit value 1
11
bin
Process data equal limit value 1
SB1.1 Overrange 1
bin
Permissible measuring range exceeded
SB1.0 Underrange 1
bin
Lower measuring range limit violated