FB_MBUS_ELV_CMa10_20

FB_MBUS_ELV_CMa10_20 1:

The function block FB_MBUS_ELV_CMa10_20 is used to read temperature and humidity sensors from elvaco.

Can be used with the sensors CMa10 and CMa20.

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

FB_MBUS_ELV_CMa10_20 2:

Further information

See Operating principle of the function block

FB_MBUS_ELV_CMa10_20 3: 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, 2400, 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

FB_MBUS_ELV_CMa10_20 4: 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.

FB_MBUS_ELV_CMa10_20 5: 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);
  strRelHumi      : ST_MBus_Info;
  strRelHumiMin   : ST_MBus_Info;
  strRelHumiMax   : ST_MBus_Info;
  strTemp         : ST_MBus_Info;
  strTempMin      : ST_MBus_Info;
  strTempMax      : ST_MBus_Info;
  strTempAvg1h    : ST_MBus_Info;
  strTempAvg24h   : ST_MBus_Info;
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

strRelHumi

ST_MBus_Info

Current relative humidity

strRelHumiMin

ST_MBus_Info

Lowest relative humidity since the last min/max reset command

strRelHumiMax

ST_MBus_Info

Highest relative humidity since the last min/max reset command

strTemp

ST_MBus_Info

Current temperature

strTempMin

ST_MBus_Info

Lowest temperature since the last min/max reset command

strTempMax

ST_MBus_Info

Highest temperature since the last min/max reset command

strTempAvg1h

ST_MBus_Info

1-hour average value for temperature

strTempAvg24h

ST_MBus_Info

24 hour average value for temperature

Requirements

Development Environment

PLC library to include

TwinCAT from v3.1.4020.14

Tc2_MBus from 3.3.5.0