Attention

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

SUB¶

Returns the difference of two 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 IN1 minus IN2. SUB(a, b) is the functional form of the - operator: a - b. Both forms are equivalent.

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

result := SUB(30, 10);   (* result = 20 *)
result := 30 - 10;       (* result = 20, operator form *)