FB_MBUS_REL_AnDi

This block is used for reading analog converters from Relay:

-AnDi 1 (1x 0/4-20 mA or 0-10 V)

-AnDi 2 (2x 0/4-20 mA or 0-10 V)

-AnDi 3 (3x 0/4-20 mA or 0-10 V)

-AnDi 4 (4x 0/4-20 mA or 0-10 V)

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

Up to 4 sensors can be connected to an AnDi 4 at the same time. The AnDi 4 behaves like 4 independent slaves.

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);
stValue          : ST_MBus_Info;
stMax            : ST_MBus_Info;
stOffset         : ST_MBus_Info;
byInfo           : BYTE; 

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