Defining Blocks of Input[LINK]
The ##def command allows a block of input text to be defined and given a name. The block of text can then be inserted anywhere in the EnergyPlus input stream by simply referencing the name of the block. (This process is called macro expansion.) The block can have parameters (also called arguments) that can be given different values each time the block is referenced.
The syntax of the ##def command is as follows:
unique name | zero or more arguments __ macro text | | | | | | ##def macro-name [ arg1 arg2,arg3 ...] text line 1 |_ | | | |_ | _| | | | | | | | | |__ one | | | | | | | or zero one zero_| space(s) more or or or or comma spaces more more more spaces spaces spaces
Example: Define a schedule macro with name “All_Const”:
##def All_Const[x] Fraction, WeekON, 1,1, 12,31; WEEKSCHEDULE, WeekON, DayON,DayON,DayON, DayON,DayON,DayON, DayON,DayON,DayON, DayON,DayON,DayON; DAYSCHEDULE, DayON, Fraction, x,x,x,x,x,x,x,x,x,x,x,x, x,x,x,x,x,x,x,x,x,x,x,x ; ##enddef
Then, in the EnergyPlus input stream (file in.imf), when we write :
SCHEDULE, Constant At 0.8, All_Const[0.8]
the result (file out.idf) is equivalent to:
SCHEDULE, Constant At 0.8, Fraction, WeekON, 1,1, 12,31; WEEKSCHEDULE, WeekON, DayON,DayON,DayON, DayON,DayON,DayON, DayON,DayON,DayON, DayON,DayON,DayON; DAYSCHEDULE, DayON, Fraction, 0.8,0.8,0.8,0.8,0.8,0.8,0.8,0.8,0.8,0.8,0.8,0.8, 0.8,0.8,0.8,0.8,0.8,0.8,0.8,0.8,0.8,0.8,0.8,0.8 ;
Macro definitions may have one or more arguments; the maximum number of arguments is 32. When a macro with arguments is referenced, its arguments must be given values. When a macro has no arguments, the brackets are still required both for macro definition and reference.
Caution: Square brackets [ ] have been used in some versions of EnergyPlus inputs as comment/units fields. These will be expanded if left in the IDF and sent to EPMacro.
Macro names must be unique (except see ##set1 below); i.e., when a macro name is defined it cannot be defined again. Macro names are limited to 40 characters.
To summarize, commands you use to define macros are the following:
##def macro-name [arg1,..,argn ] macro-text
Defines a macro with the name macro-name and arguments “arg1” through “argn”. “Macro-text” is one or more lines of text. If there are no arguments, the syntax is ##def macro-name macro-text.
Indicates the end of the macro definition initiated by ##def.
##def1 macro-name [arg1,..,argn ] macro-text
This is the same as ##def but there is only one line of text so that the terminating command ##enddef is not required.
##set1 macro-name macro-text
Like ##def1 but has no arguments and macro-text is evaluated before storing. “Macro-text is evaluated” means that if macro-text contains other macros, these macros will be expanded, and the expanded text becomes the macro-text defined by ##set1.
##def1 xx 123 ##set1 yy xx is equivalent to: ##set1 yy 123 ##set1 can also be used to redefine macro-name. ##set1 x 0 . . . ##set1 x #eval[ x+1 ] (see Arithmetic Operations for description of the #eval macro.)
The built-in macro called #eval[ ] can be used to perform arithmetic, literal, and logical operations. It can be abbreviated to # [ ].
eval[ X OP Y ] or #[ X OP Y ]
gives the result X OP Y. The allowed values for X, OP, and Y, and the corresponding result, are shown in the following table.
|X *||OP **||Y||Result|
|number||/ (divided by)||number||number|
|literal1||// (concatenate)||literal2||literal " literal1literal2“|
|literal1||/// (concatenate)||literal2||literal “literal1 literal2”|
|literal||EQS (=)||literal||logical (true or false) case sensitive|
|literal||NES ()||literal||logical (true or false) case sensitive|
|literal||EQSU (=)||literal||logical (true or false) not case sensitive|
|literal||NESU ()||literal||logical (true or false) not case sensitive|
|logical||AND||logical||logical (true or false)|
|logical||OR||logical||logical (true or false)|
|–||NOT||logical||logical (true or false)|
|number||EQ (=)||number||logical (true or false)|
|number||NE ()||number||logical (true or false)|
|number||GT (>)||number||logical (true or false)|
|number||GE ()||number||logical (true or false)|
|number||LT (<)||number||logical (true or false)|
|number||LE ()||number||logical (true or false)|
#eval[** 1 + 2 **] when expanded becomes 3.
#eval[** 1 + #eval[2 * 3] **] when expanded becomes 7.
##set1 city Washington
DesignDay, #[ city[ ] /// SUMMER ], ! Design Day Name
DesignDay, "Washington SUMMER", ! Design Day Name
The following example illustrates the use of #eval inside #if commands:
##if #[** city[ ] EQS Chicago **]
##if #[#[** city[ ] EQS Chicago ] and #[** occup[ ] NES low **]** **]**
1.For logical values:
False = 0 or BLANK,
True = any other character
2.A literal must be enclosed inside a pair of double quotes if it contains BLANKs or reserved characters like [ ] ( ) ,
E.g., “abc *def”
Otherwise, the quotes around the literals are optional.
3.Literal concatenation operators // and /// produce quoted literals.
E.g., # [ large /// office ] gives “large office”
4.Literals are case sensitive. For example, “Chicago”, “CHICAGO” and “chicago” are distinct.
5.EQS and NES are case sensitive string comparisons. EQSU and NESU are case insensitive string comparisons.
6.Literals are limited to 40 characters.