Rack and pinion lifts used to carry flammable material or explosive material

Nowadays the rack and pinion lifts are controlled by PLCs, the PLCs work cyclic and it may cause serious problems

A real time controller is necessary

Introduction

Introduction

IC Pin-out

INPUTS: F1, F2, F3 (Buttons inside the elevator) - 1U, 2U, 2D, 3D (Buttons on each floor) - AF1, AF2, AF3 (Sensors to determine Floor) - Limit switches (top and button) - Smoke, Fire, Load sensors

OUTPUTS: Door Motor, VFD-UP. VFD-DOWN, Fire-Alarm, Load-Alarm. Smoke-Alarm

Design Flow

FSM: Finite state machine (Moore Machine with 7 states)

Verilog Program

module lift (clk,reset,limswtop,limswbot,smoke,fire,load,f1,f2,f3,u1,u2,d2,d3,af1,af2,af3,fire_alarm,load_alarm,smoke_alarm,door,vfd_up,vfd_down);

always @ (reset or limswtop or limswbot or smoke or fire or load or f1 or f2 or f3or u1 or u2 or d2 or d3 or af1 or af2 or af3 or c_state) begin…end

always @ (posedge clk) begin…end

assign …assign ……endmodule

Schematic

Simulation

Encounter Synthesis

Layout

Schematic

Timing and Power Report

Verify Geometry

Verify Connectivity

Thank you

PLC POWER