Calculation Engine Comparison Functions

The following are functions for value comparison and bit-level logic to be used in the OAS Calculation Engine:

Bit Compare

Bit compare of a specific bit postion of an integer value.

Parameters:

• Integer value to evaluate
• Bit position

Examples:

BITC([Tag.Value],4)
BITC(4096,[Tag.Value])

Bit Shift Left

Bit shift left a specified number of bits of an integer value.

Parameters:

• Integer value to evaluate
• Number of bits to shift left

Examples:

BITSHIFTLEFT([Tag.Value],2)
BITSHIFTLEFT(2048, [Tag.Value])

Bit Shift Right

Bit shift right a specified number of bits of an integer value.

Parameters:

• Integer value to evaluate
• Number of bits to shift right

Examples:

BITSHIFTRIGHT([Tag.Value],2)
BITSHIFTRIGHT(2048, [Tag.Value])

Bitwise And

Bitwise AND of 2 integers.

Parameters:

• Integer value to evaluate
• Integer value to evaluate

Examples:

BITWISEAND([Tag1.Value],[Tag2.Value])
BITWISEAND(2048,[Tag.Value])
BITWISEAND([Tag.Value],64)

Equal

Comparison operator placed between two values, returning true if the first is equal to the second

Examples:

[Tag1.Value] = [Tag2.Value]
100.0 = [Tag.Value]
[Tag.Value] = -50

Greater Than

Comparison operator placed between two values, returning true if the first is greater than the second

Examples:

[Tag1.Value] > [Tag2.Value]
100.0 > [Tag.Value]
[Tag.Value] > -50

Greater Than or Equal

Comparison operator placed between two values, returning true if the first is greater than or equal to the second

Examples:

[Tag1.Value] >= [Tag2.Value]
100.0 >= [Tag.Value]
[Tag.Value] >= -50

High Byte

Returns the high byte of a word.

Parameters:

• Value to convert

Example:

HIGHBYTE([Tag.Value])

High Word

Returns the high word of an integer.

Parameters:

• Value to convert

Example:

HIGHWORD([Tag.Value])

Less Than

Comparison operator placed between two values, returning true if the first is less than the second

Examples:

[Tag1.Value] < [Tag2.Value]
100.0 < [Tag.Value]
[Tag.Value] < -50

Less Than or Equal

Comparison operator placed between two values, returning true if the first is less than or equal to the second

Examples:

[Tag1.Value] <= [Tag2.Value]
100.0 <= [Tag.Value]
[Tag.Value] <= -50

Low Byte

Returns the low byte of a word.

Parameters:

• Value to convert

Example:

LOWBYTE([Tag.Value])

Low Word

Returns the low word of an integer.

Parameters:

• Value to convert

Example:

LOWWORD([Tag.Value])

Not Equal

Comparison operator placed between two values, returning true if the first is not equal to the second

Examples:

[Tag1.Value] <> [Tag2.Value]
100.0 <> [Tag.Value]
[Tag.Value] <> -50