FB_MBUS_IST_SensonicII

This block is used to read heat meters from Ista:

-Sensonic II

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

Maximum number of readings The devices are supplied from a battery. The number of read operations is therefore limited. An internal counter prevents communication exceeding 96 times per day on average. The user must make sure that excessive queries are prevented.

Functionality of the block

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 meter to be read with this block.

stSecAdr: Secondary address of the meter to be read with this block (see ST_MBUS_SecAdr).

bStart: A positive edge of this input triggers one reading of the meter.

bSND_NKE: TRUE initializes the meter for each read operation and sets the meter to the first telegram (SND_NKE).

bReadInit: If the PLC is restarted, the meter is read once.

tMinSendTime: Standard 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: Unit of the energy values to be output by the block. 0=W(h) / 1=KW(h) / 2 =MW(h) / 3=GW(h).

bDisabled: TRUE = deselection of the 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);
stEnergy         : ST_MBus_Info;
stColdEnergy     : ST_MBus_Info;
stPower          : ST_MBus_Info;
stVolume         : ST_MBus_Info;
stFlow           : ST_MBus_Info;
stForwardTemp    : ST_MBus_Info;
stReturnTemp     : ST_MBus_Info;
stDiffTemp       : ST_MBus_Info;
stDeviceError    : ST_MBus_Info; 

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: this output goes TRUE as soon as an error occurs. This error is described via the variable eError.

eError: In the event of an error the output issues an error code (see E_MBUS_ERROR). bError goes TRUE at the same time.

dwIdNumber: Serial number of the meter (secondary address).

byStatus: Device status.

byGEN: Software version of the device.

byCounter: Number of times the master has accessed data of the respective slave.

usiRecivedAdr: Received primary address (0-250).

eMedium: Medium (see E_MBUS_Medium).

sMan: Manufacturer code.

VAR_IN_OUT

stCom : ST_MBUS_Communication; 

stCom: This structure is used to link the block FB_MBUSKL6781() with the meter blocks (see ST_MBUS_Communication).

Requirements