Anyone pls help with Siemens Step 7 analogue signal Rolling average code/FB

Network 1 // Divide the calculation result (VD0) by 99, store it in AC0 .

// This routine produces a rolling average of the last 100 scans worth of an analog input.

// 

// VD0 holds the average of the last 100 scans of the analog input AIW0. VD0 is multiplied by 99 in preparation 

// to be added to the new analog value.

// 

// 

LD     SM0.0

MOVR   0.0, AC0

MOVR   VD0, AC0

*R     99.0, AC0

Network 2 // Convert the raw analog value (AIW0) to a real number, add it to the calculation result (AC0), divide by 100, move to VD0.

// The analog input AIW0 is converted to a real number, added to the calculation result in the rung above,

// divided by 100 and moved to VD0.

// 

LD     SM0.0

MOVD   +0, AC1

MOVW   AIW0, AC1

DTR    AC1, AC1

+R     AC0, AC1

/R     100.0, AC1

MOVR   AC1, VD0

Network 3 // Truncate the calculation result, move it to VD4, move the higher order word (VW6) to VW8.

// The result VD0 which is a 32 bit real number is truncated to extract the 16 bit integer value 

// which is held in VW6 and is moved to VW8. Use VW8 in any other part of your program as the

// analog average.  

// 

// the response time of the value is dependant upon the scan time. 

// 

LD     SM0.0

TRUNC  VD0, VD4

MOVW   VW6, VW8