FB_MBUS_Scan

The function block FB_MBUS_Scan can be used to scan the M-Bus. All primary addresses (0..250) are queried successively. The array arrDevice is used to show certain device information.

Only the primary address is used for scanning.

The primary address of all devices must be set.

The function block can only be executed together with the function block FB_MBUSKL6781().

Inputs

VAR_INPUT
  bStart       : BOOL;
  bStop        : BOOL;
  eBaudrate    : E_MBUS_Baudrate := eMBUS_Baud2400;
  bStart       : BOOL;
  bDisabled    : BOOL := FALSE;
END_VAR

Name	Type	Description
bStart	BOOL	The search is started with a positive edge at this input.
bStop	BOOL	The search is stopped with a positive edge at this input.
eBaudrate	E_MBUS_Baudrate	300, 600, 1200, 2400, 4800, 9600 baud
bDisabled	BOOL	TRUE = deselection of the function block

Inputs/outputs

VAR_IN_OUT
  stCom : ST_MBUS_Communication;
END_VAR

Name	Type	Description
stCom	ST_MBUS_Communication	This structure is used to link the function block FB_MBUSKL6781() with the meter blocks.

Outputs

VAR_OUTPUT
  bBusy           : BOOL;
  bReady          : BOOL;
  bError          : BOOL;
  eError          : E_MBUS_ERROR;
  usiAddress      : USINT;
  usiCount        : USINT;
  arrDevice       : ARRAY [0..250] OF ST_MBus_Scan;
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	This output outputs an error code in the event of an error. bError goes TRUE at the same time.
usiAddress	USINT	Primary address of the meter to be read with this function block.
usiCount	USINT	Number of detected valid devices
arrDevice	ARRAY OF ST_MBus_Scan	Information about the detected devices

Requirements

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