P: number of decimals
Range of values: 0,1,2,3
The output AQ is the result of the equation formed from the operand values and
operators. AQ will be set to 32767 if a divide by 0 or overflow occurs, and -32768
if a negative overflow (underflow) occurs.
Parameter p (number of decimals)
The values V1, V2, V3, and V4 can be provided by the actual value of another already-programmed function:
Analog comparator: Ax – Ay
Analog trigger: Ax
Analog amplifier: Ax
Analog multiplexer: AQ
Analog ramp: AQ
Analog math: AQ
PI controller: AQ
Data latching relay: AQ
Up/Down counter: Cnt
Parameter p applies to the display of V1, V2, V3, V4 and AQ in a message text.
Description of the function
The analog math function combines the four operands and three operators to form an equation. The operator
can be any one of the four standard operators: +, -, *, or /. For each operator, you must set a unique priority
of High ("H"), Medium ("M"), or Low ("L"). The high operation will be performed first, followed by the medium
operation, and then by the low operation. You must have exactly one operation of each priority. The operand
values can reference another previously-defined function to provide the value. The analog math function
rounds the result to the nearest integer value.
The number of operand values is fixed at four and the number of operators is fixed at 3. If you need to use
fewer operands, use constructions such as " + 0" or " * 1" to fill the remaining parameters.
You can also configure the behavior of the function when the Enable parameter "En"=0. The function block
can either retain its last value or be set to 0.
Possible errors: Zero division and overflow
If the analog math function block execution results in zero division or overflow, it sets internal bits that
indicate the type of error that occurred. You can program an analog math error detection function block in
your circuit program to detect these errors, and to control the program behavior as needed. You program one
analog math error detection function block to reference one specific analog math function block.
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