Beckhoff KL6001, Documentation

Page: 35 / 41

Access from the user program
KL6001 35 Version: 3.0.0
Example
Output
Control byte Input
Status byte Comment
00000000 0XXXX0X0 Start data transmission
00100001
Data Bytes: In D0 and D1
Register data 0XXXX0X0 The controller instructs the terminal to send 2 data
… … …
00100001
Data Bytes: In D0 and D1 0XXXX0X1 The terminal has loaded 2 data into transmission FIFO;
the command is executed
01010000
Data Bytes: In D0 to D4 0XXXX0X1
Data Bytes: DC The controller instructs the terminal to send 5 data (D0-
D4)
… … …
01010000
Data Bytes: In D0 and D1,
register data 0XXXX0X0 The terminal has loaded 5 data into transmission FIFO;
the command is executed
RA/RR: REICEIVE-ACCEPTED/RECEIVE-REQUEST
The terminal notifies the controller via a change of state in RR that the data quantity displayed in IL0-IL1 is
located in D0-D4. The data shift is acknowledged in the control byte using RA; only then will new data be
transmitted by the terminal to the controller.
Example:
Output
Control byte Input
Status byte Comment
00000000 0XXXX00X Start data transmission
0XXX000X 0011X01X The terminal instructs the controller to accept 3 data from
D0-D2
... ... ...
0XXX001X 0011X01X The controller has accepted data
0XXX001X 0101X00X The terminal instructs the controller to accept 5 data from
D0-D4
... ... …
0XXX000X 0101X00X The controller has accepted data
IR/IA: INIT-REQUEST/INIT-ACCEPTED
If IR is high, the terminal initializes. The send and receive functions are blocked, the FIFO pointers are reset
and the interface is initialized with the values from the relevant registers (R32-R35, R18). The completion of
the initialization is acknowledged by the terminal using IA.
Example:
Output
Control byte Input
Status byte Comment
0XXXXXXX 0XXXXXXX Start data transmission
00000100 0XXXXXXX Initialization is requested by the controller
… … …
00000100 00000100 The terminal has completed the initialization
00000000 00000100 The controller requests data exchange
… … …
00000000 00000000 The terminal is ready