The functions listed here can be used in expressions in the ComfileHMI editor.

Functions with a single argument:

• sin : Sine
• cos : Cosine
• tan : Tangent
• asin : Arc-Sine
• acos : Arc-Cosine
• atan : Arc-Tangent
• sinh : Hyperbolic Sine
• cosh : Hyperbolic Cosine
• tanh : Hyperbolic Tangent
• floor : Rounds number down to the nearest integer value.
• ceil : Rounds number up to the nearest integer value.
• exp : e raised to a given exponent
• log : Natural Logarithm
• log10 : Log base 10
• fabs : absolute value
• sqrt : square root

Functions with 2 arguments:

• pow(x,y) : x raised to the power y
• fmod(x,y) : the remainder of x divided by y.

Functions with 5 arguments:

• scale(input, minimum input, maximum input, minimum output, maximum output) : Scales input proportionally to (maximum input - minimum input) / (maximum output - minimum output).

Functions with a variable number of arguments:

• max(x,y,z,…) : Returns the largest value from the argument list
• min(x,y,z,…) : Returns the smallest value from the argument list
• max_index(x,y,z,…) : Returns the index of the largest value in the argument list
• min_index(x,y,z,…) : Returns the index of the smallest value in the argument list
• avg(x,y,z,…) : Returns the average of all values in the argument list
• stdev(x,y,z,…) : Returns the standard deviation of all values in the argument list

The following functions are used to read from and write to internal memory.

• set_mem(index, value) : Writes value to internal memory at index.
• mem(index) : Reads the value current stored in internal memory at index.
• set_mem(index, value1, value2, …, valueN)

Functions associated with the system. They take no arguments.

• action_group_repeat_index : Retrieves the number of times a user event was executed.
• idle_seconds : Returns the number of seconds since the screen was last touched.
• idle_minutes : Returns the number of minutes since the screen was last touched.
• prev_screen_id : Returns the id of the screen that the current screen navigated from.
• screen_id : Returns the id of the screen the current screen.
• tick_count : The number of milliseconds since the system was powered on.
• touch_duration : The number of milliseconds since the last time the screen was touched. If the screen has never been touched -1 is returned.

Functions to convert between data types.

• text_to_num(string) : Parses a character string in base 10.
• num_to_text_int(number) : Prints a number as a base 10 integer character string.
• num_to_text_int(number, digits) : Prints a number as a base 10 integer character string with leading 0's. Ex: num_to_text_int(3.14, 4) prints “0003”.
• num_to_text_hex(number) : Prints a number as a base 16 integer character string.
• num_to_text_hex(number, digits) : Prints a number as a base 16 integer character string with leading 0's
• num_to_text_dec(number, fractional digits) : Prints a number as a base 10 character string with a given number of fractional digits. Ex: num_to_text_dec(3.14159, 4) = “3.1416”

In the Add Action –> Run Action Group properties, in the Advanced Options is the ability to pass a primary and secondary parameter to the actions (Add Action Parameter and Add Secondary Action Parameter respectively) .

The parameters can then be read from within the executing action using the following functions.

• action_param : Retrieves the primary parameter passed to an action.
• sub_action_param : Retrieves the secondary parameter passed to an action group.

Functions with no argument.

• year : The current year
• month : The current month (1~12)
• day : The day of the month
• day_of_week : The day of the week (0~6), 0 = Sunday
• hour : The hour of the day (0~23)
• minute : The minute component of the current hour (0~59)
• second : The second component of the current minute (0~59)
• rand : returns a random number in the range of 0~32767 (0x7FFF)

Functions that take 1 argument but return no value.

• set_year : Sets the current year
• set_month : Sets the current month (1~12)
• set_day : Sets the day of the month
• set_hour : Sets the hour of the day (0~23)
• set_minute : Sets the minute component of the current hour (0~59)
• set_second : Sets the second component of the current minute (0~59)
• srand(seed) : Sets the seed value for generating random numbers with the rand() function.

It is recommended to call srand(tick_count()) to seed the random number generator before using rand().

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