Y_SB_DataRecordRead

This function block is able to read data records from modules configured on the SliceBus Node.

Parameters

*	Parameter	Data Type	Description	Default
VAR_IN_OUT
E	Record	ANY	Provides the data read. The Length output indicates the number of bytes read.
VAR_INPUT
B	Execute	BOOL	Upon the rising edge of the Execute input, all other inputs are read and the function block becomes operational. If an input needs to be modified, the value will have to be changed and the Execute input will have to be re-triggered.	FALSE
E	SlotID	WORD	Slot ID of the Slicebus node module. The Slicebus nodeMaster has Slot ID 0.	WORD#0
E	Index	WORD	Index of the data record that is to be read. See Notes below for details on which index should be used to read diagnostic and parameter data.	WORD#0
E	MaxLength	UDINT	Maximum number of bytes which are to be read from the object. The variable connected to the VAR_IN_OUT Record must have at least this length, otherwise Error is set and an ErrorID is provided. If a value of 0 is passed, then the full size of the connected VAR_IN_OUT Record data type is used by default.	UDINT#0
VAR_OUTPUT
B	Done	BOOL	The Done output is set to TRUE when the commanded action has completed successfully. If another function block takes control before the action is completed, the Done output will never become TRUE. This output is reset when Execute becomes FALSE.
B	Busy	BOOL	For function blocks with Execute input, the Busy output is set to TRUE upon the rising edge of the Execute, and set to FALSE when Done, CommandAborted or Error outputs becomes TRUE. In the case of a function block with an Enable input, Busy indicates that the function block is operating, but may not be ready to provide valid outputs.
B	Error	BOOL	The Error output is set to TRUE if an error has occurred during the operation of the function block. The output is cleared when the Execute or Enable input becomes FALSE.
E	ErrorID	UINT	The ErrorID output provides the identifier of the error when there is an active error in the function block execution. The output is cleared when the Execute or Enable input becomes FALSE.
E	Length	UDINT	Length of the read data in number of bytes

Notes

All Input and In-Output values are read in the FB call with the rising edge of Execute. If a command is ongoing a change of the Execute input has no influence.
Use the index numbers shown in the following table to read diagnostic and parameter data.

Reading Index	Description
16#0000	Read DS 00h of the diagnostic data.
16#0001	Read DS 01h of the diagnostic data.
16#007D	Read the whole parameter data.
16#007E	Read DS 00h of the parameter data.
16#007F	Read DS 01h of the parameter data.
16#0080 … 16#0090	Read DS 80h ... DS 90h of the parameter data.

Error Description

See the Function Block ErrorID List

Example

The following example shows how to read the Diagnostic interrupt information of the Parameter data from the 050-1BA10 counter module. According to the product manual this information can be found in DS 00h of the Parameter data.

Using the information from the Notes section, this parameter needs to be read using Index 16#007E. In the example below, the value of DS 00h is 16#40, indicating that the Diagnostic interrupt is enabled.