Attention

IronPLC can only run very simple programs. The steps described are accurate but many language features are not yet supported.

ADD¶

Returns the sum of two or more inputs.

IEC 61131-3	Section 2.5.1.5.3
Support	Supported

Signatures¶

#	Input (IN1)	Input (IN2)	Return Type	Support
1	`SINT`	`SINT`	`SINT`	Supported
2	`INT`	`INT`	`INT`	Supported
3	`DINT`	`DINT`	`DINT`	Supported
4	`LINT`	`LINT`	`LINT`	Supported
5	`USINT`	`USINT`	`USINT`	Supported
6	`UINT`	`UINT`	`UINT`	Supported
7	`UDINT`	`UDINT`	`UDINT`	Supported
8	`ULINT`	`ULINT`	`ULINT`	Supported
9	`REAL`	`REAL`	`REAL`	Supported
10	`LREAL`	`LREAL`	`LREAL`	Supported
11	`TIME`	`TIME`	`TIME`	Not yet supported

Returns the sum of IN1 and IN2. ADD(a, b) is the functional form of the + operator: a + b. Both forms are equivalent.

For integer types, overflow behavior wraps around (modular arithmetic).

result := ADD(10, 20);   (* result = 30 *)
result := 10 + 20;       (* result = 30, operator form *)