ELE5001: Network Design- Two Stage Ammonia Refrigeration System- Report Writing Assignment

Internal Code: 2IAB

Report Writing Assignment:

Task: You have been assigned the task of designing a small section of a communications network in an abattoir two-stage ammonia refrigeration system. The section of the plant that you will be controlling includes 4 package plant ammonia compressors, their associated valving and the fan banks on the evaporator and condenser. Each compressor has a small PLC performing local control and providing a number of inputs and outputs (I/O) to the larger plant PLC that coordinates the overall plant operation. The compressor PLCs are located in a small control cabinet mounted on the compressor pad. The valves are field mounted on the ammonia piping to and from the compressors and are controlled by the plant PLC. The network is to be an AS-Interface network, connected to a Pepperl and Fuchs AS-Interface master VBM-CLX-DM in a ControlLogix rack on the main PLC. The details of the rest of the control system are not relevant to your task, you just need to ensure connectivity between the devices and the AS-I master. There is an Emergency Stop button located on each compressor control panel and the main control cabinet that must be linked using safety I/O back to a Safety Monitor that is located in the main PLC cabinet. The design of the safety system in out of the scope of this project and will be completed by an RPEQ. Using the details provided in this document and the accompanying simplified P&ID drawing, you are to present a network proposal. Any additional files are accessible through StudyDesk. Your report will include:

• A brief (one page) report explaining design considerations and justifying any choices.
• Specification of hardware components chosen, including cable type.
• Basic layout, shown in a network diagram. (This may be a marked up version of the supplied layout drawing.)
• An I/O List for the AS-I network, sorted by node.
• An equipment list, including quantities, part number, description of all parts.

Round cable lengths up to the nearest 50m and include any relevant notes.