Average - Running Average
This function returns the running avergae of an input value over a desired number of samples.
Arguments
IN%
The changing integer value to be averaged.
N%
The number of samples of IN% over which the average is to be calculated. This must be a constant integer value.
Return Values
Q%
The average of IN% over N% samples.
Example
The following graph shows the value of Q% in successive calls to AVERAGE changes when a value of 1000 is passed as IN%. Each call to AVERAGE is made in the Clock task with a 5ms time-base.
Target/ Language Restrictions
None.
See Also
FILTER
Bcd2bin - Binary-coded Decimal to Binary Conversion
This function converts a binary coded decimal number to a normal binary integer. It is typically used to operate on digital input data from the IOBOX (for example data from thumbwheel switches).
Arguments
IN%
The BCD format value to convert.
Return Values
Q%
The binary version of IN%.
Example
To encode the decimal value 954 in a variable (X%) in BCD format, X% would need to be set to the value 2388 as shown in the following table.
|
9 |
5 |
4 |
|
1 0 0 1 |
0 1 0 1 |
0 1 0 0 |
BCD2BIN can then be used to retrieve the decimal value from X%.
Target/ Language Restrictions
None.
See Also
BIN2BCD
BCD2SEG
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Bin2bcd - Binary to Binary-coded Decimal Conversion
This function converts a normal binary integer to a binary coded decimal number. It is typically used to operate on digital output data to the IOBOX.
Arguments
IN%
The binary format value to convert.
Return Values
Q%
The BCD version of IN%.
Example
To encode the decimal value 954 in a variable (X%) in BCD format, X% would need to be set to the value 2388 as shown in the following table.
|
9 |
5 |
4 |
|
1 0 0 1 |
0 1 0 1 |
0 1 0 0 |
BIN2BCD can be used to convert the decimal value into BCD.
Target/ Language Restrictions
None.
See Also
BCD2BIN
BCD2SEG
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Bcd2seg - Binary-coded Decimal to Seven-segment Display Data
This function converts binary coded decimal to 7-segment LED codes. This function is typically used to operate on digital output data to the IOBOX.
The output will consist of three 7-segment display digit data.
The output of this function can be split into 8-bit parts, which are arranged as follows:
|
Bit # |
7 |
6 |
5 |
4 |
3 |
2 |
1 |
0 |
|
Segment |
- |
g |
f |
e |
d |
c |
b |
a |
The least significant byte represents the first of the three digits, the maximum value which can be converted is 999. Leading zeros will be given.
Arguments
IN%
The BCD format value to convert.
Return Values
Q%
The 7-segment display data.
Example
The following example shows how the segment codes are obtained for displaying the value 123.
Target/ Language Restrictions
None.
See Also
BIN2BCD
BCD2BIN
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Blkdef - Block Parameter Write
This block writes a given integer value to a consecutive set of parameters.
An example use of this block is for defaulting a PLC register menu or a sequence of menu 20 parameters.
The block can only be used with integer parameters since only an integer value can be defined. Between 1 and 99 parameters can be set in one operation. The parameters must be consecutive (i.e. in numerical order). If a problem occurs when writing to any parameter, the block will terminate at that parameter and return an error code. This block should not be used in a real-time task such as CLOCK or SPEED since it may take some time to execute.
Arguments
StrtP%
The starting parameter number in the format MMPP, e.g. the value 1811 will start writing at parameter #18.11.
NumP%
The number of consecutive parameters to be written.
Value%
The integer value to write.
Return Values
Q%
This has the value 1 if the block executed correctly and 0 if the block failed to execute.
Err%
|
Value |
Meaning |
|
0 |
OK. |
|
1 |
Illegal parameter. |
|
2 |
Value out of range. |
|
3 |
Parameter is read-only. |
Example
The following example sets parameter #20.20, #20.21 and #20.22 to the value 10.
Target/ Language Restrictions
None.
See Also
PFIXWRITE
PFIXWRITE6
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