ULINT
64-bit unsigned long integer with maximum range for whole numbers.
Key Takeaways
- 64-bit unsigned long integer with maximum range for whole numbers.
- Intermediate-level topic in Data Types & Variables
- Related to: UDINT, LINT, LWORD
Detailed Definition
64-bit unsigned long integer with maximum range for whole numbers. This term is essential for understanding data types in industrial automation and PLC programming.
In IEC 61131-3 PLC programming, ULINT is one of the standard data type primitives that programmers select to represent their process variables, internal state, and exchange data with HMIs and SCADA systems. 64-bit unsigned long integer with maximum range for whole numbers.
Picking the wrong type is one of the most common sources of subtle PLC bugs — overflow on the small side, wasted memory and slower scan cycles on the large side. Experienced PLC engineers reach for the smallest type that comfortably covers their value range plus a safety margin.
On the wire and in HMI systems, ULINT maps to specific representations that PLC, drives, and SCADA software all need to agree on. Mismatches at the integration boundary produce data that looks plausible but is silently wrong — a class of bug that surfaces in production rather than on the test bench.
Common Questions
What is ULINT?
64-bit unsigned long integer with maximum range for whole numbers.
What are related concepts I should learn?
To fully understand ULINT, you should also familiarize yourself with UDINT, LINT, and LWORD. These concepts work together in industrial automation systems.
Continue Learning
Ready to deepen your understanding of ULINT? Here are some recommended resources:
Was this helpful?
Let us know if this glossary term helped you understand ULINT better.
Your feedback helps us improve our glossary and create better content for the PLC programming community.
Quick Info
- Category
- Data Types & Variables
- Difficulty
- Intermediate
- Tier
- Advanced
About Data Types & Variables
Data structures, variable types, and memory organization