FB_SMIPosRead

VAR_INPUT

bStart           : BOOL;
dwAddr           : DWORD := 0;
eAddrType        : E_SMIAddrType := eSMIAddrTypeAddress;
dwAddrOption     : DWORD := 0;
eCommandPriority : E_SMICommandPriority := eSMICommandPriorityMiddle;

bStart: The function block is activated and the command is send by applying a positive edge to this input.

dwAddr: Manufacturer code (0-15), address of a device (0-15), bit field (16 bits) for the group addressing or slave ID (32-bit key ID). This input has no meaning if a collective call (broadcast) is sent.

eAddrType: Determines whether the input dwAddr is evaluated as manufacturer code, device address (see E_SMIAddrType) or as part of the group address. Addressing via slave ID (eAddrType = eSMIAddrTypeSlaveId) is not permitted.

dwAddrOption: Reserved for future extensions.

eCommandPriority: Priority (high, medium or low) with which the command is processed by the PLC library (see E_SMICommandPriority).

VAR_OUTPUT

bBusy      : BOOL;
bError     : BOOL;
udiErrorId : UDINT;
wPosition  : WORD;

bBusy: When the function block is activated the output is set, and it remains active until execution of the command has been completed.

bError: This output is switched to TRUE as soon as an error occurs during the execution of a command. The command-specific error code is contained in udiErrorId. The output is set back to FALSE by the reactivation of the function block via the bStart input.

udiErrorId: Contains the command-specific error code of the most recently executed command. It is set back to 0 by the reactivation of the function block via the bStart input (see error codes).

wPosition: The position read out. The value 0 corresponds here to the upper final position and the value 65535 (0xFFFF) to the lower final position.

VAR_IN_OUT

stCommandBuffer : ST_SMICommandBuffer; 

stCommandBuffer: reference to the structure for communication (buffer) with the FB_KL6831KL6841Communication() function block (see ST_SMICommandBuffer).

Prerequisites