Error Statistics (ERRSTAT)

Several process control functions and function blocks may generate error conditions causing these ERRSTAT counters to increment: reversed parameters, incorrect parameter values, overflow conditions, underflow conditions, and divide by zero.

Parameter values for the ERRSTAT function block:

Parameter	Data Type	Description
RESET	BOOL	When TRUE, resets the error counters to zero.
Reversed	DINT	Reversed parameters error counter. The count increments on each execution of the function when the parameters are reversed. The initial value is zero.
Param	DINT	Incorrect parameter values error counter. The count increments on each execution of the function when the parameter value is incorrect. The initial value is zero.
Overflow	DINT	Overflow condition error counter. The count increments on each execution of the function when the overflow condition occurs. The initial value is zero.
Underflow	DINT	Underflow condition error counter. The count increments on each execution of the function when the underflow condition occurs. The initial value is zero.
ZeroDivide	DINT	Divide by zero error counter. The count increments on each execution of the function when the divide by zero error occurs. The initial value is zero.

TIP: Counter values do not wrap to zero. Counter overflow conditions return a value of -1.

Function Block Diagram Example

Structured Text Example

ERRSTAT(Reset_count);

Reversed_count := ERRSTAT.Reversed;

IncorrectParam_count := ERRSTAT.Param;

Overflow_count := ERRSTAT.Overflow;

Underflow_count := ERRSTAT.Underflow;

ZeroDivide_COUNT := ERRSTAT.ZeroDivide;

Global Library Functions and Function Blocks

AVG

SCALE

SLEW

Square Root Extraction (SQRTX)

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