In the ComfileHMI, a Internal variable refers to a named location in the ComfileHMI hardware's memory.
If a Internal variable is used without first being declared, it will be implicitly declared and available for use immediately.
A list of variables in use can be obtained from the ComfileHMI Editor's main menu: Project→View Addresses and Variables in Use.
String variables were added in a subsequent version of the ComfileHMI Editor software. They are declared and used with a
$ prefix. For example
Internal memory is a specific memory region in the ComfileHMI hardware. It is volatile, so it will be erased when the ComfileHMI hardware is powered off.
There are 1024 memory locations (indexed 0~1023) that can be written and read to. They can store 64-bit integers and double-precision floating point values.
set_mem(index, value): Writes
valueto internal memory at
mem(index): Reads the value current stored in internal memory at
Multiple values can be stored adjacently in internal memory by passing multiple value arguments to the
set_mem(index, value1, value2, …, valueN)
See the internal memory functions.
Conditional expressions provide the ability to compare variables.
!= operators are supported. They are identical to the comparison operators used in the C programming language.
|| are boolean AND and boolean OR operators respectively.
MotorStatus > 1
Heater1 == 0 ⇐
Heater1 is equal to 0
Heater1 != 0 ⇐
Heater1 does not equal 0
% operators are supported for performing math on variables. They are identical to the arithmetic operators used in the C programming language.
MotorStatus + 1
& operators are supported for bitwise operations. They are identical to the bitwise operators used in the C programming language.
(bits >> 2) & 1