BM_Write

Description

The function FC BM_WRITE can be used to write a parameter by service data communication to the bmaXX controller.

Parameter Input	Data Type	Description
Req	BOOL	TRUE= Beginning to write a parameter FALSE= Finish to write a parameter
Index	INT	Parameter Index
Subindex	BYTE	Parameter Subindex
Value	DWORD	Value of a parameter
LEN	BYTE	Parameter type value

Parameter Ausgang	Data Type	Description
Done	BOOL	Writing done without errors
Busy	BOOL	Writing status is still active
Error	BOOL	Writing error; ErrorID is valid
ErrorID	DWORD	Communication ErrorID Siemens error list

Parameter Input and output	Data Type	Description
Axis	UDT	BM Motion Control axis variable

Notes:

A command from "BM_Write” must not be activated before a command from another function block has been not successfully executed.

If an error occurs during the command execution, the error must be reset with “BM_Reset”. Function block command will be executed successfully at

"BM" .AXIS [x] .DRIVE.BM_AXIS_STATUS.ParmRW_Active = 0.

Input Req

TRUE at parameter input REQ starts the communication.

FALSE: not active

Input Index

The parameter index number to be read.

Input Subindex

The parameter subindex number to be read.

Input LEN

The value of the parameter data type to be read

LEN	Data Type	Description of byte length
0x0001	BOOL	1
0x0002	SINT	1
0x0003	INT	2
0x0004	DINT	4
0x0005	USINT	1
0x0006	UINT or WORD	2
0x0007	UDINT or DWORD	4
0x0008	FLOAT	4

Output Done:

TRUE: Reading the parameter without errors if finished

FALSE: Not active

Output Busy:

TRUE: Reading status still active.

FALSE: Not active.

Output Error:

TRUE: There is an error at the service data communication for the parameter Read Information at ErrorID is valid and error information refer to S7 Description.

FALSE: No error active.

Output Value:

Parameter value to be read.

Output Len:

Total data length of service data communication.

Output ErrorID:

The information of Service Communication error (for details refer to S7 Description)

Input and output Axis:

UDT type symbolic BM Motion Control axis variable.

During the programming with the template data module DB5 (symbolic “BM”) the following symbol text must be used: "BM".AXIS[x] (x is the drive axis number).