PLC Introduction

3. Logic system used before PLCs became common.
5. OUTPUT The combination of inputs and outputs in a PLC system.
7. A basic PLC application involving starting and stopping a device.
10. SEQUENCES A PLC‑based task that activates steps in order.
11. An ON/OFF signal such as a pushbutton.
14. INTERLOCKS A PLC‑based task that prevents unsafe machine operation.
15. LOGIC A programming method that visually resembles relay diagrams (same as 6‑Across).
16. MODULE Receives signals from sensors, switches, and devices.

1. A basic PLC application that moves items from one point to another.
2. INPUT A variable signal such as temperature or pressure.
3. LOGIC Traditional control using physical relays and wiring.
4. A system that manages, commands, or regulates device behavior.
6. LOGIC A graphical programming language resembling electrical relay diagrams.
8. MODULE Sends signals to motors, solenoids, lights, and actuators.
9. A digital controller that executes logic instructions.
12. Sorting objects based on sensor feedback.
13. A digital controller used in industrial automation (same as 1‑Across).
14. CYCLE The repeating process of reading inputs, executing logic, and updating outputs.
16. The communication points between the PLC and external devices.