Beckhoff KL2535, Documentation, Page: 39 / 49

Access from the user program
Register communication
Control byte 1 (in register communication)
Control byte 1 (CB1) is located in the output image [
}
37] , 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.
Legend
Bit Name Description
CB1.7 RegAccess 1
bin
Register communication switched on
CB1.6 R/W 0
bin
Read access
1
bin
Write access
CB1.5 to
CB1.0 Reg. no. Register number:
Enter here the number of the
register [
}
40] that you wish
- to read with input data word DataIn [
}
37] , or
- to write with output data word DataOut [
}
37] .
Status byte 1 (in register communication)
The status byte 1 (SB1) is located in the input image [
}
37] , 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.
Legend
Bit Name Description
SB1.7 RegAccess 1
bin
Acknowledgement for register access
SB1.6 R 0
bin
Read access
SB1.5 to
SB1.0 Reg. no. Number of the register that was read or written.
Channel 2
The control and status bytes of channel 2 (CB2 and SB2) have the same structure as the control and status
bytes of channel 1.
KL2535, KL2545 39 Version: 2.0.0