S7-PCI315:Dualport communication

Dualport communication with SFC1012 and SFC1013

To exchange data with the standard Hilscher driver functions xChannelIORead and xChannelIOWrite, the S7-PCI315 provides fake process images for the driver. The driver functions can read/write from/to these images. With the SFCs 1012 and 1013 this data can be fetched/put from this areas and may be copied to any location within the PLC program.

SFC 1012 CIFXIN (Write data for xChannelIORead)

CALL SFC/FC 1012

RD_WR	:= TRUE	//INPUT BOOL
OFFSET	:= MW 0	//INPUT INT
LENGTH	:= MW 0	//INPUT INT
DATA	:= P#M0.0 BYTE 1	//INPUT ANY
RET_VAL	:= MW 0	//RESULT INT

Parameter	Type of data	Description
RD_WR	BOOL	FALSE to read data from the input area of the Dualport, TRUE to write. Normally TRUE.
OFFSET	INT	Offset in dualport input area.
LENGTH	INT	Length of array to read/write in the dualport.
DATA	ANY	Pointer to the data within the PLC.
RET_VAL	INT	0 on success, else a Siemens-typical error code.

SFC 1013 CIFXOUT (Read data from xChannelIOWrite)

CALL SFC/FC 1013

RD_WR	:= TRUE	//INPUT BOOL
OFFSET	:= MW 0	//INPUT INT
LENGTH	:= MW 0	//INPUT INT
DATA	:= P#M0.0 BYTE 1	//INPUT ANY
RET_VAL	:= MW 0	//RESULT INT

Parameter	Type of data	Description
RD_WR	BOOL	FALSE to read data from the output area of the dualport, TRUE to write. Normally FALSE.
OFFSET	INT	Offset in dualport output area.
LENGTH	INT	Length of array to read/write in the dualport.
DATA	ANY	Pointer to the data within the PLC.
RET_VAL	INT	0 on success, else a Siemens-typical error code.

Status word

If successful the BR of the status word is set, OR, STA and /FC are zero.

If failed the BR, OR, STA and /FC of the status word are zero.