Control and status byte

Process data mode

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	-	-	-	-	-	-	Toggle

Bit	Name	Description
CB7	RegAccess	0_bin	Register communication off (process data mode)
CB.6 to CB.2	-	0_bin	reserved
CB.0	Toggle	Toggle bit

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	-	-	-	IN_2	IN_1	WDT_Run	Toggle_St

Bit	Name	Description
SB.7	RegAccess	0_bin	Acknowledgment for process data mode
SB.6 to SB.4	-	0_bin	reserved
SB.3	IN_2	Status input 2
SB.2	IN_1	Status input 1
SB.1	WDT_Run	0_bin	Watchdog timer is not triggered. The outputs are not set.
SB.1	WDT_Run	1_bin	Watchdog timer is active and locked. The outputs are set.
SB.0	Toggle_St	This bit follows the toggle bit in the control byte

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	Acknowledgment 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.