illustrate a PLC based batch process to the following

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illustrate a PLC based batch process to the following

Illustrate A Plc Based Batch Process To The Following 1 (464.11 KiB) Viewed 57 times

Project 2 – Concrete Batching Plant A concrete batching plant is to produce any of three standard batches ( mixtures ) when one of three switches are toggled on then off (momentary on/off input only). There are four tanks A, B, C and D contain dry cement, dry sand, gravel and water. Each of the four tanks has a conveyor or valve controlling the flow into a fifth blending tank. Write a program to provide each of the following batches to the blender. Project 2 -Controller tags: Local:5:1.Data.O Start Local:5:1.Data.1 Stop (N/C) Local:5:1.Data.2 Batch 1 Switch ( Use toggle switch ) Local:5:1.Data.3 Batch 2 Switch ( Use toggle switch) Local:5:1.Data.4 Batch 3 Switch ( Use toggle switch ) Local:5:1.Data.5 N/O Aux Local:5:1.Data.6 N/C Aux Local:4:0.Data.0 BCD 0 BCD MULTIPLEXING Local:4:0.Data.1 BCD 1 Local:4:0.Data.2 BCD 2 Local:4:0.Data.3 BCD 3 Local:4:0.Data.4 Cement Strobe Local:4:0.Data.5 Sand Strobe Local:4:0.Data.6 Gravel Strobe Local:4:0.Data.7 System Running Light Local:4:0.Data.8 System Stopped Light Local:4:0.Data.9 Cement Conveyor Local:4:0.Data.10 Sand Conveyor Local:4:0.Data.11 Gravel Conveyor Local:4:0.Data.12 Water Valve Local:4:0.Data.13 Mixer Local:4:0.Data.14 Empty Valve Local:4:0.Data.15 Blending in Progress Light

Project 2 -Functionality The program functionality should be as follows: On the first scan all accumulated and preset values should be reset to zero. No operation will occur until the start button is pressed and the running light comes on (the toggle switches will have no effect ). The system stopped light will operate whenever the system is not running. The stop button will stop the system anytime and reset all timers ( including presets) On toggling ( on then off ) any of the batch switches the correct time values should be loaded into the timer presets. Tank Batch 1 A (cement) 4 secs Batch 2 6 secs 4 secs 5 secs B (sand) 6 secs Batch 3 4 secs 4 secs 4 secs 11 secs C (gravel) 5 secs D (water) 13 secs 20 secs Interlocking must be provided so that once any batch has been selected it must be completed even if other batch switches are selected. On selection of a batch the Blending in Progress Light and Mixer will start immediately. The Cement Conveyor, Sand Conveyor, Gravel Conveyor, and Water valve will all activate at the same time and de activate after the batch timings. The mixer will continue to mix for 15 seconds after all the batch timings have elapsed. After the mixer has stopped the Empty valve will energize for 10 seconds. The Blending in progress light will then de activate and the process will be ready to start another batch. The 7 seg displays will indicate the accumulated timer values as they count down without any noticeable update delay.