FB_MBUSKL6781

The function block FB_MBUSKL6781 is used to read M-Bus devices via the KL6781 Bus Terminal.

The function block can only be executed together with at least one meter function block.

An instance of this function block required for each KL6781 terminal.

The function block requires a task time of maximum 10 ms at 2400 baud. If higher task times are required, this function block must be outsourced to a fast task.

Inputs

VAR_INPUT
  usiRetries : USINT;
  bStart  : BOOL;
  bDisabled : BOOL := FALSE;
END_VAR

Name	Type	Description
usiRetries	USINT	Number of retries in the event of errors
bStart	BOOL	All meters are read once on the positive edge of this input.
bDisabled	BOOL	TRUE = deselection of the function block.

Inputs/outputs

VAR_IN_OUT
  stComIn  : ST_KL6781inData22B;
  stComOut : ST_KL6781outData22B;
  stCom    : ST_MBUS_Communication;
END_VAR

Name	Type	Description
stComIn	ST_KL6781inData22B	Process image of the inputs
stComOut	ST_KL6781outData22B	Process image of the outputs
stCom	ST_MBUS_Communication	This structure is used to link the function block with the meter blocks.

Outputs

VAR_OUTPUT
  bBusy : BOOL;
  bReady : BOOL;
  bError : BOOL;
  eError : E_MBUS_ERROR; 
END_VAR

Name	Type	Description
bBusy	BOOL	The bBusy output is TRUE as long as the meter is being read.
bReady	BOOL	The bReady output is TRUE for one cycle, once meter reading is completed.
bError	BOOL	This output goes TRUE as soon as an error occurs. This error is described via the eError variable.
eError	E_MBUS_ERROR	In the event of an error, the output issues an error code and bError becomes TRUE at the same time.

Requirements

Development Environment	PLC library to include
TwinCAT from v3.1.4020.14	Tc2_MBus from 3.3.5.0