Expression (Float Output) - Johnson Controls - Metasys - LIT-12011147 - Software Application - Controller Configuration Tool - 15.0

Controller Tool Help

Brand
Johnson Controls
Metasys
Product name
Controller Configuration Tool
Document type
User Guide
Document number
LIT-12011147
Version
15.0
Revision date
2022-11-18
Language
English

The Expression logic block allows the user to write complex logic without taking up many objects in the system. The Expression (Float Output) logic blocks allow the user to define a block with multiple inputs and write an equation that results in a float value.

Note: If you include Boolean or Enum inputs in an expression, the expression cannot result in a float output. To create a float output result, use only float inputs in the expression.
Table 1. Expression (Float Output)
Name Data Type Exposed for Connection by Default Description Default Value
Inputs
Input Float Yes   0.0
Outputs
Present Value 1 Float Yes Indicates the output of the block. 0.0
Properties        
Expression Boolean, Enum, Float N/A Provides an editable field for the token string used to create the expression. See Table 2 for a list of available tokens. N/A
Table 2. Expression Tokens
Token String UI Tab Location Description Function
= Enum, Boolean, Float Equal Compares two Booleans, or two float values, or two Enum values. Returns true if they are equal and false otherwise. The datatype of operand 1 must be the same as operand 2.
Note: If the absolute value of the difference between operand 1 and operand 2 is less than or equal to 0.01, they are considered equal.
!= Enum, Boolean, Float Not Equal

Compares two Booleans, or two float values, or two Enum values. Returns true if they are not equal and false otherwise. The datatype of operand 1 must be the same as operand 2.

Note: If the absolute value of the difference between operand 1 and operand 2 is less than or equal to 0.01, they are considered equal.
( Enum, Boolean, Float Opening Parenthesis Prioritizes the calculation of the enclosed string. For example, (A+B)*3 evaluates A+B, then multiples the result by 3.
) Enum, Boolean, Float Closing Parenthesis
AND 2 Enum, Boolean, Float Logical AND Produces the result of a Boolean AND operation on Boolean operand 1 and Boolean operand 2.
OR 2 Enum, Boolean, Float Logical OR Produces the result of a Boolean OR operation on Boolean operand 1 and Boolean operand 2.
NOT Boolean Logical NOT Produces the result of a Boolean NOT operation on Boolean operand 1.
XOR Boolean Logical XOR Produces the result of a Boolean XOR operation on Boolean operand 1 and Boolean operand 2.
TRUE Boolean Boolean True  
FALSE Boolean Boolean False  
0–9 Float Numbers 0–9  
. Float Decimal Point  
+ Float Arithmetic Plus Produces an output from adding the value of operand 1 to operand 2.
/ Float Arithmetic Divide Produces an output by dividing the value of operand 1 by operand 2.
^ Float Arithmetic Power Produces an output by raising the value of operand 1 to the power of operand 2.
- Float Arithmetic Minus Produces an output by subtracting the value of operand 2 from operand 1.
* Float Arithmetic Multiply Produces an output from multiplying the value of operand 1 to operand 2.
> Float Greater Than Performs a greater than comparison between two float values and returns True if operand 1 is greater than operand 2, and otherwise False.
<= Float Less Than or Equal Compares two float values and returns True if operand 1 is less than or equal to operand 2, and otherwise False.
Note: If the absolute value of the difference between operand 1 and operand 2 is less than or equal to 0.01, they are considered equal.
< Float Less Than Compares two float values and returns True if operand 1 is less than operand 2 and False otherwise.
>= Float Greater Than or Equal Compares two float values and returns True if operand 1 is greater than or equal to operand 2, and otherwise False.
Note: If the absolute value of the difference between operand 1 and operand 2 is less than or equal to 0.01, they are considered equal.
COS Float Cosine Function Produces COS of operand 1 expressed in radians.
SIN Float Sine Function Produces SIN of operand 1 expressed in radians.
TAN Float Tangent Function Produces TAN of operand 1 expressed in radians.
ACOS Float Arc Cosine Function Produces ARC COS of operand 1 expressed in radians.
ASIN Float Arc Sine Function Produces ARC SIN of operand 1 expressed in radians.
ATAN Float Arc Tangent Function Produces ARC TAN of operand 1 expressed in radians.
SQRT Float Square Root Function Returns the square root of operand 1.
ABS Float Absolute Function Returns the absolute value of operand 1.
LOG Float Natural Logarithm Function Returns the natural logarithm of operand 1.
LOG10 Float Logarithm Base 10 Function Returns the logarithm base 10 of operand 1.
EXP Float Exponential Function Returns the exponential value of operand 1.
DEL Enum, Boolean, Float Delete Token  
CLEAR Enum, Boolean, Float Clear Expression  
Figure 1. Boolean Logic

The preceding figure may result from one of the following three expressions:

I1 AND I2 AND NOT I3

I1 = TRUE AND I2 = TRUE AND I3 != TRUE

I1 = TRUE AND I2 = TRUE AND I3 = FALSE

Figure 2. Enumeration and Boolean Logic

The preceding figure may result from the following expression:

I1 != On AND I2

1 This input or output is the Default Element of the block.
2 This token string applies to Boolean input types only.