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	Ladder Logic
		At the March SRS meeting the subject of ladder logic or relay logic came up and there seemed to be some interest in what it is. I’ve been using this since 1975 when I started working as an electrical draftsman.
		The reason it’s called ladder logic is the program is drawn pictorially and looks like a ladder, unlike a program listing you may be familiar with like basic or C++ which use alpha numeric characters.
		As I said, ladder diagrams show the logic of the controls but they are not used to build the system, a wiring diagram is used for that.
	www.seattlerobotics.org /encoder/may97/ladder1.htm (1305 words)

	Extended relay ladder logic for programmable logic controllers - Patent 5963446
		Using relay ladder logic, the control programmer is provided with a system to replace a coil with an ACTION block containing at least one complex expression.
		The relay ladder logic referred to herein is a programming language in which input/output signals are written with symbols, such as electrical circuit symbols that conventionally represent relay contacts and relay coils.
		Because only a single language is used, i.e., relay ladder logic language, knowledge of multiple languages is no longer required to program a programmable controller and separate compilation steps are not required to combined the features of all of the languages used in the controlled program.
	www.freepatentsonline.com /5963446.html (2916 words)

	What is Ladder Logic?
		A program in ladder logic, also called a ladder diagram, is similar to a schematic for a set of relay circuits.
		Ladder logic is useful because a wide variety of engineers and technicians can understand and use it without much additional training because of the resemblance.
		Ladder logic is widely used to program PLCs, where sequential control of a process or manufacturing operation is required.
	www.what-is-net.info /what-is-ladder-logic.html (374 words)

	Ladder logic
		Ladder logic is a method of drawing electrical logic schematics.
		Ladder logic is used when programming languages such as C, Java would consume too much overhead.
		Ladder logic is then used to drive output coils, so that when the preceding logical functions have been evaluated - the output coil changes state.
	www.xasa.com /wiki/en/wikipedia/l/la/ladder_logic.html (494 words)

	Ladder logic: Definition and Links by Encyclopedian.com
		...Ladder logic Ladder logic Ladder logic is a method of drawing electrical...knew how to read ladder logic, PLC makers made their systems programmable in ladder logic.
		Ladder logic is a method of drawing electrical schematics wherein positive power is on the left hand side of the paper and negative power (or ground) is on the right hand side.
		Since electrical engineers already knew how to read ladder logic, PLC makers made their systems programmable in ladder logic.
	www.encyclopedian.com /la/Ladder-logic.html (304 words)

	Ladder Logic - FIRSTwiki
		Ladder Logic was the name of the 1998 season FIRST game.
		Ladder Logic was the last game before FIRST switched to alliances, and some people consider it the last OLD FIRST game.
		Ladder Logic was the first year that the 12v motorcycle batteries were used.
	www.firstwiki.org /Ladder_Logic (540 words)

	Ladder logic - Definition, explanation
		Ladder logic is useful because a wide variety of engineers and technicians can understand and use it without much training.
		Ladder logic is widely used to program industrial Programmable logic controllers, where a series of complex logic checks are required before something is turned on.
		Typically, the ladder logic languages from two different providers will not be compatible; ladder logic is better thought of as a set of closely related programming languages rather than one language.
	www.calsky.com /lexikon/en/txt/l/la/ladder_logic.php (1139 words)

	"Ladder" diagrams - Chapter 6: LADDER LOGIC - Volume IV - Digital (Site not responding. Last check: )
		They are called "ladder" diagrams because they resemble a ladder, with two vertical rails (supply power) and as many "rungs" (horizontal lines) as there are control circuits to represent.
		In ladder diagrams, the load device (lamp, relay coil, solenoid coil, etc.) is almost always drawn at the right-hand side of the rung.
		Ladder diagrams (sometimes called "ladder logic") are a type of electrical notation and symbology frequently used to illustrate how electromechanical switches and relays are interconnected.
	www.allaboutcircuits.com /vol_4/chpt_6/1.html (748 words)

	Ladder Logic
		Ladder logic is the language used to communicate between humans and the PLC.
		The beauty of ladder logic is the code language is set up so that a high level of understanding is not essential to start programming.
		Ladder logic is set up in a sequence of left (inputs) and right (outputs) with conditionals in between.
	www.bsu.edu /web/slhager/bsu/ladderlogic.htm (394 words)

	Graphical interfaces for monitoring ladder logic programs - Patent 5321829
		Ladder logic programs and databases associated therewith are imported and accessed by the Development System for use in the development of the Man-Machine Interfaces.
		The PLC responds to the input as directed by a ladder logic program which, to a large degree, simulates the response of what used to be accomplished by older systems with a set of relays and other control devices.
		Ladder logic programs are imported and accessed by the Development System for use in the development of the Man-Machine Interfaces.
	www.freepatentsonline.com /5321829.html (4262 words)

	The Basics of Ladder Logic
		Ladder logic uses switch or relay contacts to implement Boolean expressions.
		In years past, ladder logic was made possible with discrete relays and was sometimes termed “relay logic.” Today most implementations are done using a specialized microprocessor-based device called a programmable logic controller (PLC).
		In the case of ladder logic, logic functions are implemented by developing a ladder diagram.
	www.ecmweb.com /ops/electric_basics_ladder_logic (743 words)

	EZ Ladder, Ladder Logic Software
		Divelbiss EZ LADDER® is a Powerful and easy to use Windows based programming platform for creating ladder diagram programs for use with any PLC on a Chip™ based controller or product.
		EZ LADDER® is easy to install and use.
		EZ LADDER® communicates to hardware targets using standard RS232 and a Null Modem - No need for special interface hardware or cables.
	www.divelbiss.com /products/software/EZ-Ladder/ezladder-overview.asp (136 words)

	Lessons In Electric Circuits -- Volume IV (Digital) - Chapter 6
		Ladder diagrams (sometimes called "ladder logic") are a type of electrical notation and symbology frequently used to illustrate how electromechanical switches and relays are interconnected.
		Logic circuits, whether comprised of electromechanical relays or solid-state gates, can be built in many different ways to perform the same functions.
		Although the program itself appears to be a ladder logic diagram, with switch and relay symbols, there are no actual switch contacts or relay coils operating inside the PLC to create the logical relationships between input and output.
	www.ibiblio.org /obp/electricCircuits/Digital/DIGI_6.html (6564 words)

	Circuit Cellar - Digital Library
		Ladder logic came along in the fabulous 1960s and matured with the great music my teenagers think was written by contemporary rap artists.
		Ladder logic’s climb to popularity originated in Motown as auto manufacturers were trying to find a suitable replacement for the relay-based automation found on their assembly lines.
		As I studied example ladder logic programs and experimented with my own ladder logic creations, I realized that the relay coils and contacts in my programs were the bits that control the behavior of my embedded programs.
	www.circuitcellar.com /library/print/0302/fred140/index.asp (411 words)

	Ladder Logic
		Ladder diagrams are specialized schematics commonly used to document industrial...
		At the March SRS meeting the subject of ladder logic or relay logic came up and there seemed to be some interest in what it is.
		Ladder Logic for PIC and AVR: Quick summary: I wrote a compiler that starts with a ladder diagram and generates native PIC16 or AVR code.
	www.ladder-help.com /ladder-logic.php (647 words)

	Ladder Logic - AskTheBrain.com
		Provided the PLC ladder logic programming for the gas plant and compressor projects and assisted in the MMI development for the control room.
		Ladder Logic programming has its strength in handling single bit digital I/O programming, but it is at best an awkward language for data processing where numerical data needs to be manipulated.
		ACM Programmable Logic Controller (PLC) - TRMI uses the DirectSoft IDE to program the Relay Ladder Logic of the PLC, which functions as an I/O preprocessor between Lane2002 and the coin machine.
	www.askthebrain.com /ladder_logic-.html (380 words)

	Ladder Logic
		Ladder Logic Module can be used for miscellaneous control needs, such as pump packages, lighting, floor warming, heat exchangers, battery chargers, water chemistry control, etc.
		The LL3216 Ladder Logic Module is the same as the LL1632 described above, except that there are 16 digital inputs instead of 32; and there are 32 digital outputs instead of 16.
		The LLPID Ladder Logic Controller is identical with the LL1632 Ladder Logic module, except that it also has 16 analog outputs, each with a PID loop which can be used to control variable speed drives, regulating valves, or other devices which require an analog input for control.
	www.henchcontrol.com /LadderLogic.htm (274 words)

	ladder logic: essays-helper.com- essays helper, term papers helper, book reports helper, research papers helper
		Both logic and sermons are meant to convince us of some higher meaning or truth, and we are supposed to accept these truths because this is what we are told.
		Whitman compares logic and sermons because he believes they both “never convince.” By this he means that we don’t need philosophers or preachers to reveal hidden truths to us; rather, he believes these truths should be obvious to each individual.
		On essays-helper.com there are hundreds of free essay abstracts written by your fellow college students on ladder logic.
	www.essays-helper.com /term-papers/3010/ladder-logic.html (415 words)

	cap2control (Site not responding. Last check: )
		When developing ladder logic, it is first necessary to develop a state transition diagram.
		Each rung of the ladder logic represents a state from the state transition along with the requirements that should be met for that state.
		Timers are also incorporated into the ladder logic to allow for certain operations to finish before the program advances to the next rung of the program.
	www.uwstout.edu /ctem/bsmfe/showcase/mfge410/1999FA/automatedhanger/cap2control.html (333 words)

	safety ladder rungs, ladders rung, ladder safety from FibreGrid's fibreglass ladder cover, RungGrip providing safety ...
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	www.fibregrid.com /products/ladderrungs.htm (157 words)

	The Basics of Ladder Logic
		Ladder logic uses switch or relay contacts to implement Boolean expressions.
		In years past, ladder logic was made possible with discrete relays and was sometimes termed “relay logic.” Today most implementations are done using a specialized microprocessor-based device called a programmable logic controller (PLC).
		In the case of ladder logic, logic functions are implemented by developing a ladder diagram.
	ecmweb.com /ops/electric_basics_ladder_logic/index.html (756 words)

	Home Toys Article
		The program (ladder logic) and word registers are usually stored in FLASH memory, while the discrete registers are stored in RAM memory.
		The next 8K words are set aside for the ladder logic, with register addresses ranging from 20000 to 37777 (octal).
		These are also read/write registers which the ladder logic keeps track of the I/O (input/output) of the PLC.
	www.hometoys.com /htinews/feb04/articles/kowch/memory.htm (308 words)

	Ladder Logic for PIC and AVR
		Ladder logic tools abstract this; you can program the PLC by wiring up relay contacts and coils on-screen, and the PLC runtime will simulate the circuit that you've drawn.
		Ladder logic is not a general-purpose programming language, but it is Turing-complete, accepted in industry, and, for a limited class of (mostly control-oriented) problems, surprisingly convenient.
		That means that you can write ladder logic that reads analog inputs, and that sends and receives characters over serial (for example to a PC, if you add a suitable level-shifter like a MAX232, or to a character LCD).
	cq.cx /ladder.pl (1619 words)

	Allen-Bradley Course CCCL21 (Site not responding. Last check: )
		This course is a skill-building course that provides maintainers with a basic understanding of RSLogix 5000 ladder logic instructions and terminology.
		In addition to using ladder logic instructions, students will be introduced to ladder logic techniques, established standards, and common rules for modifying ladder logic.
		Maintainers who have little or no practical experience with controllers, who are responsible for modifying Logix5000 controllers using RSLogix 5000 software, and who need to learn how to interpret or maintain ladder logic for any application should attend this course.
	www.kendallgroup.com /ab/cccl21.asp (262 words)

	Ladder Logic Programming
		It's true that ladder logic uses conditional statements, subroutines and FOR NEXT loops but there are some very significant differences.
		Also, in most ladder logic programming environments you have to specify the address of each of your inputs and outputs before it will even let you start programming.
		You should note that because of the nature of ladder logic you can not simply put a timer attached directly to the left hand side without a relay conditional between it.
	xtronics.com /toshiba/Ladder_logic.htm (2030 words)

	Online PLC Training - PLC Programming - Ladder Logic
		PLC training and ladder logic training will help you in your current job or help get you the job you want.
		It has easy to understand text with relay ladder logic routines that can be used again and again.
		Most of the time, the order of the bits in a rung doesn't matter in relay ladder logic.
	www.plc-training.com (1220 words)

	Horton Automation - Micratap Software
		RLE Ladder Logic is ideal for engineering and field staff who develop process control applications.
		The power of RLE Ladder Logic lies in the way it integrates the classical Ladder Logic with Functional Blocks, and therefore the schematics support a high degree of versatility and complexity.
		The RLE Ladder Logic conforms to the IEC 1131 standard requirements.
	www.horton-automation.com /html/mtap_software.htm (419 words)

	PLCS.net - Interactive Q & A - plc ladder logic
		hello, i'am trying to write logic where by 2 dock doors are used, if a first dock door is open, the second cant open, till the first is closed, so that both cant be open together, but can be closed together.
		The second is to write an english language description of the logic step by step.
		The third is to try writing the ladder, and then post it here for suggestions and further help.
	www.plctalk.net /qanda/showthread.php?t=1322 (292 words)

	Ladder Logic Prog 4 Industrial Applic Intro
		This course is designed to introduce participants to ladder logic programming language that is used to program a PLC (programmable logic controller).
		The course presents the various hardware and software components required, communication protocols, and ladder logic programming instructions required to solve various control related problems.
		Participants will write, debug, download and run several ladder logic programs and control various input devices (push buttons, limit switches, selector switches,.etc.) and out devices (pilot lights, stack lights, motors, fans,.etc.) tat hare connected to a PLC.
	www.kettering.edu /employers/continuinged/courses/Ladder_Logic_Prog_4_Indus_Applic_Introduction_Outline.htm (280 words)

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