Programmable Logic Controllers

Investigate the signal processing within the CPU of the PLC and the various signals. Investigate the communications involved with modern systems regarding the PLC-PLC and PLC-LAN systems using HMI interfaces or SCADA with varying manufacturers. Input/output I/O. Binary, hexadecimal and octal to denary conversions. Data Integrity: Longitudinal Redundancy Check (LRC), Cyclical Redundancy Checking (CRC). RS232 and RS422 signal communications. Networking topologies: star and bus.

Grade (P/M/D): MERIT Produce a Ladder Logic program to run on a Programmable Logic Controller (PLC). The program should control the safe operation of traffic lights at a cross roads. The design should allow for a pedestrian crossing to be added. This must also operate in a safe manor for the pedestrians and vehicle drivers. The system will be implemented using a Mitsubishi FX PLC. (This is the available hardware.) The development will take place on a Windows PC running Mitsubishi GX Developer a...

Grade (P/M/D): DISTINCTION Task 1 ===== This document details the suitability of a number of Programmable Logic Controllers (PLCs) to meet the requirements of a process to be controlled. The requirements also specify the use of three classes of PLC: 1. compact 2. modular 3. rack mounted Task 2 ====== Identify input devices and output devices from the following list: • Switch • Optical sensor • Control valve • DP transmitter • Start/stop button station • Limit switch • High level ...