INT

**INT is a 16-bit signed integer** with values from −32,768 to +32,767. The default integer type for most PLC programming tasks: counters, timer presets, scaled analog values, and small to medium quantities.

**Range:** −32,768 to +32,767.

**Memory:** exactly 2 bytes (16 bits).

**Common uses:** - Counter accumulators (CTU, CTD) - Timer presets and accumulators (PT, ET — though some IDEs use TIME instead) - Scaled analog input/output values (a 4–20 mA module typically presents 0–32,767) - Loop indexes - Setpoints, recipe values - Modbus holding registers when interpreted as signed

**Syntax across major IDEs:** - Siemens SCL: `myCount : INT := 0;` - Studio 5000 ST: `myCount : INT := 0;` (Allen-Bradley's native 16-bit signed) - CODESYS / TwinCAT: `myCount : INT := 0;` - Mitsubishi GX Works3: uses K-prefix decimal literals; equivalent type is `INT`

**Common pitfalls:** overflow at 32,767 + 1 wraps to −32,768; using INT for values that could exceed ±32k (use DINT instead — the memory savings aren't worth the bug risk); mixing INT with WORD in arithmetic without explicit cast.

**Conversion:** `INT_TO_DINT()`, `INT_TO_REAL()`, `DINT_TO_INT()` (with possible truncation).

**See also:** DINT (signed 32-bit), WORD (unsigned 16-bit), UINT (explicitly unsigned 16-bit), REAL (32-bit floating point).