FB_MBUS_General_Ext
There are devices that send values distributed to several telegrams. With this function block all messages can be read by any device.
The variable arrTelegram[1..cMBUS_MaxTelegrams].arrData[1..cMBUS_MaxData] provides a maximum of cMBUS_MaxTelegrams telegrams maximum cMBUS_MaxData data.
The number of telegrams to be read can be changed by the constant cMBUS_MaxTelegrams.
The number of data per telegram can be changed by the constant cMBUS_MaxData.
 | This function block is not suitable for BC/BX. The function block can only be executed together with the function block FB_MBUSKL6781(). |
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;
usiAddress: Primary address of the counter, that shall be readout with this module.
stSecAdr: Secondary address of the counter, that shall be readout with this module.
eBaudrate: 300, 600, 1200, 2400, 4800, 9600 baud.
bStart: Positive edge on this input, the meter is read out once.
bSND_NKE: TRUE to initialize the meter at each reading, and sets the meter on the first telegram (SND_NKE).
bReadInit: After restarting the PLC, the meter is read out once.
tMinSendTime: Standard t#2s. When this time exceeds, the counter is rereadout. At t#0s the counter is not readout and can be readout with bStart manually.
usiUnit: Unit of the energy values. 0=W/J(h) / 1=KW/KJ(h) / 2=MW/MJ(h) / 3=GW/GJ(h).
bDisabled: TRUE = disable the function block.
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;
bBusy: The bBusy output is TRUE while the meter is being read.
bReady: The bReady output is TRUE for one cycle, once meter reading is completed.
bError: The bError output becomes TRUE as soon as an error occurs. The error is described via the variable eError.
eError: The eError output issues an error code when an error occurs (see E_MBUS_ERROR).
dwIdNumber: Serial number of the meter (secondary address).
byStatus: Status of the meter. Please refer to device description for meanings.
byGEN: Meter software version.
byCounter: Transmission counter (number of transmitted RSP_UD).
usiRecivedAdr: Received primary address (0-250).
eMedium: Medium (see E_MBUS_Medium).
sMan: Manufacturer code.
arrTelegram: Maximum cMBUS_MaxTelegrams telegrams (see ST_MBus_Data2). The meaning of the values are explained in the M-Bus protocol of the device.
VAR_IN_OUT
stCom : ST_MBUS_Communication;
stCom: About this structure, the block FB_MBUSKL6781() is connected to the meter function blocks (see ST_MBUS_Communication).
Example view:
