Description

Function Description

This function block integrates the value of the IN input (typically a flow volume) over time, until an adjustable limit is reached (typically a volume).

and can be configured as additional parameters.

NOTE: When using the EN enable input the following must be taken into account:

If the block has not been called for a long time because the EN enable input is set to FALSE, the totalizer block runtime is extended until the next call. If the watchdog timeout is exceeded this can lead to a PLC stop.

To remedy this, the enable input should not be used or set permanently to TRUE, so that the block is processed during every cycle.

NOTE: This function block performs an internal initialization in the first program cycle after a warm start or cold start (e.g. application download or power cycle) of the PLC program.

Due to this, you have to make sure that the function block is invoked in the first program cycle. In case of invoking the function block in a later program cycle, the internal initialization will not be performed and the outputs may deliver wrong values.

WARNING

UNEXPECTED OUTPUT BEHAVIOUR

Make sure that the function block is always invoked in the first program cycle.

Failure to follow these instructions can result in death, serious injury, or equipment damage.

Properties

The function block has the following properties

The integration can be temporarily paused and newly installed
Equipment that can also consider very small input values
Division whereby the low limit of the values of IN will no longer be considered
Use in the mode "Reverse of the integral summation": the output OUT decreases from threshold value to zero (inc_dec = 1)

Representation in FBD

Representation:

Representation in LD

Representation:

Representation in IL

Representation:

CAL TOTALIZER_Instance (IN:=DigitalVariable, 
    MODE:=OperatingMode, PARA:=Parameters, 
    TR_I:=outc_InitializationInput, 
    TR_S:=InitializationOrder, OUT=>ResultOfIntegration, 
    INFO=>AdditionalInformation, STATUS=>StatusWord)

Representation in ST

Representation:

TOTALIZER_Instance (IN:=DigitalVariable, 
    MODE:=OperatingMode, PARA:=Parameters, 
    TR_I:=outc_InitializationInput, 
    TR_S:=InitializationOrder, OUT=>ResultOfIntegration, 
    INFO=>AdditionalInformation, STATUS=>StatusWord);

TOTALIZER Parameter Description

Description of input parameters:

Parameter	Data type	Description
IN	REAL	To integrated numerical sizes (only when > 0)
MODE	Mode_TOTALIZER	Operating mode
PARA	Para_TOTALIZER	Parameter
TR_I	REAL	Initialization input from outc
TR_S	BOOL	Initialization command

Description of output parameters:

Parameter	Data type	Description
OUT	REAL	Result of the integration of IN (limited to thld)
INFO	Info_TOTALIZER	additional information generated by function block
STATUS	WORD	Status word

Parameter Description Mode_TOTALIZER

Data structure description

Element	Data type	Description
hold	BOOL	"1": Stopping the integration
rst	BOOL	"1": Resetting the function block

Parameter Description Para_TOTALIZER

Data structure description

Element	Data type	Description
thld	REAL	Integral threshold of IN
cutoff	REAL	Division (≥0)
inc_dec	BOOL	"1": Reverse of integration "0": Normal mode

Parameter Description Info_TOTALIZER

Data structure description

Element	Data type	Description
outc	REAL	Total result of the integration of IN
cter	UINT	Counter for integral calculation
done	BOOL	"1": output OUT achieves integral threshold thld

Base	Lower limit	Upper limit
Hexadecimal	16#0	16#FFFF
Octal	8#0	8#177777
Binary	2#0	2#1111111111111111

Data	Representation in one of the bases
0000000011010011	16#D3
1010101010101010	8#125252
0000000011010011	2#11010011

REAL

The REAL type is encoded in a 32 bit format.

The possible value ranges are shown in the figure below:

When a result is:

between -1,175494e-38 and 1,175494e-38, it is considered to be a DEN;
less than -3.402824e+38, the symbol -INF (for - infinity) is displayed;
greater than +3.402824e+38, the symbol INF (for + infinity) is displayed;
undefined (square root of a negative number), the symbolNAN is displayed.

NOTE: The IEC 559 standard defines two classes of NAN: the silent NAN (QNAN) and the signaling NAN (SNAN). A QNAN is a NAN with a most significant fraction bit while an SNAN is a NAN without a most significant fraction bit (bit number 22). QNANs can be propagated via most arithmetic operations without throwing an exception. As for SNANs, they generally indicate n invalid operation when they are used as operands in arithmetic operations (see %SW17 and %S18).

NOTE: When a DEN (non-standardized number) is used as an operand, the result is not significant.