FB_MBUS_General_Ext

Some M-Bus devices send values distributed over several telegrams. The function block FB_MBUS_General_Ext can be used to read all telegrams from any M-Bus devices.

The variable arrTelegram[1..cMBUS_MaxTelegrams].arrData[1..cMBUS_MaxData] supplies a maximum of cMBUS_MaxData data from a maximum of cMBUS_MaxTelegrams telegrams. String values and vendor-specific information are not shown correctly.

The number of telegrams to be read can be changed with the constant cMBUS_MaxTelegrams.

The number of data per telegram to be read can be changed with the constant cMBUS_MaxData.

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

	Further information See Operating principle of the function block

Inputs

VAR_INPUT
  usiAddress   : USINT;
  stSecAdr     : ST_MBUS_SecAdr;
  eBaudrate    : E_MBUS_Baudrate := eMBUS_Baud2400;
  bStart       : BOOL;
  bSND_NKE     : BOOL := TRUE;
  bReadInit    : BOOL := TRUE;
  tMinSendTime : TIME := t#2s;
  usiUnit      : USINT;
  bDisabled    : BOOL := FALSE;
END_VAR

Name	Type	Description
usiAddress	USINT	Primary address of the meter to be read with this function block.
stSecAdr	ST_MBUS_SecAdr	Secondary address of the meter to be read with this function block.
eBaudrate	E_MBUS_Baudrate	300, 600, 1200, 2400, 4800, 9600 baud
bStart	BOOL	All meters are read once on the positive edge of this input.
bSND_NKE	BOOL	TRUE initializes the meter for each read operation and sets the meter to the first telegram (SND_NKE).
bReadInit	BOOL	If the PLC is restarted, the meter is read once.
tMinSendTime	TIME	Default t#2s. The meter is read again, once the time set here has elapsed. If t#0s the meter is not read and can be read manually with bStart.
usiUnit	USINT	Unit of the energy values to be output by the function block. 0=W(h) / 1=KW(h) / 2 =MW(h) / 3=GW(h).
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;
  dwIdNumber     : DWORD;
  byStatus       : BYTE;
  byGEN          : BYTE;
  byCounter      : BYTE;
  usiRecivedAdr  : USINT;
  eMedium        : E_MBUS_Medium;
  sMan           : STRING(3);
  arrTelegram    : ARRAY [1..cMBUS_MaxTelegrams] OF ST_MBus_Data2;
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.
dwIdNumber	DWORD	Serial number of the meter (secondary address)
byStatus	BYTE	Device status
byGEN	BYTE	Software version of the device
byCounter	BYTE	Number of times the master has accessed data of the respective slave
usiRecivedAdr	USINT	Received primary address (0-250)
eMedium	E_MBUS_Medium	Medium
sMan	STRING	Manufacturer sign
arrTelegram	ARRAY OF ST_MBus_Data2	Maximum cMBUS_MaxTelegrams telegrams. The meaning of the values is explained in the M-Bus protocol for the device.

Requirements

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