![a plc ladder logic program consists of a numberof rungs with each rung controlling an input a plc ladder logic program consists of a numberof rungs with each rung controlling an input](https://dipslab.com/wp-content/uploads/2020/06/IO_Instruction.png)
4,295,529, WILLIAM N STRICKLAND teaches a blowout preventer for attachment to the drill stem and being placed within the drill casing during well operations provides a bottom seal assembly having an attachment for slideably attaching the bottom seal assembly peripherally to a section of drill stem with the bottom seal assembly having at least one flow opening allowing oil, gas and drilling fluids to pass therearound. Presently the panels systems being used are operated either by air or arc electrical. These panels enable the BOP control manifold to be placed in a safe area so that it can remain operational in emergency condition.
![a plc ladder logic program consists of a numberof rungs with each rung controlling an input a plc ladder logic program consists of a numberof rungs with each rung controlling an input](https://uploads-ssl.webflow.com/5e4c4a3ffa444d333b501251/5e7edb041825e05657d8a8d5_BR12IjUr4uYtfqSa_sZ8AsW-WHGnsN74Hsie3Jiw28hxzQRVNjhVpby1ekWvBmkU2C96JdH6GGQXcTANDO9__jF4ogyz16bQKuGuf98WIdz157UYUkOe1ekHwIRYqmQCVOJCPjAU.gif)
These panels allow complete control and pressure monitoring of the BOP control system from Drill floor or any other alternative place. These units are operated from the unit as well as remote control panels. The program runs continuously until STOP PB is pressed Note: We can reduce the number of memories used.The present invention relates to a programmable logic controller (PLC) based touch screen driven remote control panel for blowout preventer (BOP) control unit and more particular to a system for coupling a network of programmable controller through an inter networking to a monitoring and controlling blowout prevention control unit (BOP Control Unit) BACKGROUND OF THE INVENTIONīOP Control units have been in existence for many years, and are generally employed in the oil and gas industry to control blow out preventer. If any PB is pressed, it will perform the respective operations. If no PB is turned on after getting into lift takes 10secs delay to open lift door again. When timer done turned on, close door motor should ON until closed limit switch is turned ON. When the open door limit switch is turned to on, the Open motor door should stop and timer needs to turn on to give time delay of 5s to close door motor. To open the lift door when it reaching the floor, Binary bits are used to store the status of Third floor PB and third-floor Limit switch RUNG 0016įrom the previous rungs memories, the Open door motor is turned ON with three interlockings like closed-door motor, Timer enables, UP/DOWN motor. To open the lift door when it reaching the floor, Binary bits are used to store the status of First floor PB and First Limit switch. To open the lift door when it reaching the floor, Binary bits are used to store the status of ground floor PB and ground Limit switch. In some cases, if someone pressed the second floor PB/First floor PB, the program will check where the lift is if it is on the ground floor or the first floor, UP Motor will turn ON to get the lift to the respective floor.įor interlocking, normally closed switch of second-floor limit switch and first-floor switch is used in Rung 0009. In some cases, if someone pressed ground floor PB/First floor PB, the program will check where the lift is if it is in the second floor or the first floor, Down Motor will turn ON to get the lift to the respective floor.įor interlocking, normally closed switch of ground limit switch and first-floor switch is used in Rung 0006 Rung 0007-0008-0009 Second floor PB is pushed to turn on latch coil to store the output of status when Second limit switch is off.
![a plc ladder logic program consists of a numberof rungs with each rung controlling an input a plc ladder logic program consists of a numberof rungs with each rung controlling an input](https://www.automation.com/getmedia/e0df7368-84b7-4f51-9159-2e9bee0ba9b4/SPC3.jpg)
RUNG 0002įirst floor PB is pushed to turn on the latch coil to store the output of status when the First limit switch is off. Starting the Operation using start latch, Ground floor PB is pushed to turn on the latch coil to store the output of status when the ground limit switch is off. Latching rung to operate the system through Master Start and Stop PB. Inputs and Outputs Elevator PLC Program PLC Program Description RUNG 000 Write the PLC ladder logic for the above-example. Limit switches are used to locate and stop the lift on each floor.One is inside the lift and the other is outside the lift. In the picture given, there are totally two floors.