FB_GENIbusGet

This function block reads a value from a GENIbus device.

Inputs

VAR_INPUT
  bStart            : BOOL;
  byAddr            : BYTE := 0;
  byClass           : BYTE := 2;
  byIDCode          : BYTE := 0;
  eCommandPriority  : E_GENIbusCommandPriority := eGENIbusCommandPriorityMiddle;
END_VAR

Name	Type	Description
bStart	BOOL	The reading process is initiated by a rising edge at this input.
byAdress	BYTE	Address of the GENIbus device to be addressed: valid entries: 1 - 200. This corresponds to the setting as is made directly on the GENIbus device. Conversion to the actual address range 32 - 231 takes place within the function block (see GENIbus standard). A broadcast command via address 255 is naturally not permitted.
byClass/byIDCode	BYTE	Class and ID code of the storage space to be read. GET commands are permissible only for classes 2, 4, 5 and 7 – an error is output for all other entries. Conversely, there is no restriction of the ID code entry, since these ranges are not without gaps and may possibly be extended.
eCommandPriority	E_GENIbusCommandPriority	Priority (high, medium or low) with which the command is processed by the PLC library.

Inputs/outputs

VAR_IN_OUT
  stCommandBuffer   : ST_GENIbusCommandBuffer;
END_VAR

Name	Type	Description
stCommandBuffer	ST_GENIbusCommandBuffer	Reference to the structure for communication (buffer) with the FB_GENIbusCommunication() function block

Outputs

VAR_OUTPUT
  bBusy             : BOOL;
  bError            : BOOL;
  udiErrorId        : UDINT;
  udiErrorArg       : UDINT;
  byValue           : BYTE;
END_VAR

Name	Type	Description
bBusy	BOOL	Starting with the edge at bStart, this output remains TRUE until the command has been processed.
bError	BOOL	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.
udiErrorId	UDINT	Contains the command-specific error code of the most recently executed command (see error codes). It is set back to 0 by the reactivation of the function block via the bStart input.
udiErrorArg	UDINT	If applicable, contains an extended description of the error code.
byValue	BYTE	Output of the read value.

Requirements

Development environment	PLC library to include
TwinCAT from v3.1.4020.14	Tc2_GENIbus from v3.3.0.0