Register communication

Control byte (for register communication)

The control byte (CB) is located in the output image, and is transmitted from the controller to the terminal.

Bit	CB.7	CB.6	CB.5	CB.4	CB.3	CB.2	CB.1	CB.0
Name	RegAccess	R/W	Reg. no.

Bit	Name	Description
CB.7	RegAccess	1_bin	Register communication switched on
CB.6	R/W	0_bin	Read access
CB.6	R/W	1_bin	Write access
CB.5 to CB.0	Reg. no.	Register number: Enter here the number of the register that you wish to read with input data word DataIN, or to write with output data word DataOUT.

The status byte (SB) is located in the input image, and is transmitted from terminal to the controller.

Bit	SB.7	SB.6	SB.5	SB.4	SB.3	SB.2	SB.1	SB.0
Name	RegAccess	R/W	Reg. no.

Bit	Name	Description
SB.7	RegAccess	1_bin	Acknowledgement for register access
SB.6	R	0_bin	Read access
SB.5 to SB.0	Reg. no.	Number of the register that was read or written.