LYCOS RETRIEVER 
Ladder
built 431 days ago
Ladder safety is something that many take for granted, yet nine out of ten people surveyed face the challenge of positioning their ladder on uneven ground. The methods they use to eliminate uneven ground are even more frightening. At least one in three people use scraps of wood, rocks, or bricks to prop their ladder, and more than half move the ladder to level ground and reach further to accomplish their task.
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"The Agility Ladder is an excellent tool to improve foot speed and coordination. The wide variety of exercises potentially performed on the ladder can benefit athletes of all ages, skill levels, and sports.
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In Ladder logic programming you do not have variables, you have registers. There are four kinds of registers: X's that are inputs, Y's that are outputs, D's that are data that can form interger, hex and real numbers, and finally R's that are internal relays. X's and Y's are pointers to the actual terminal strip connectors (what you use a screw driver on to connect wires) on the PLC. If you energize an input, let's say 5, then X0005 will have an on status; ... if you give Y0023 an on status then relay 23 will flick on. R's are just about the same as X's and Y's except that they don't point to any hardware. They just hold an on or off value inside of the PLC's memory. R's can be useful.
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Ladder inspection and repair at Metrovision of Prince George's County, Md., by Batavia® Services Inc. made a significant impact on getting a handle on fleet ladder problems and safety. On-site work was scheduled from 3 p.m. to 12 a.m. for three days during one week. Ladders were taken off trucks and brought to a warehouse for inspection and repair. After inspection, ladders that could not be repaired and ladders that were not cost-effective to repair were put out of service. A total of 62 ladders were inspected and repaired at a cost of $2,007. Six ladders had to be replaced.
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[W]hat is ladder logic programming really like? Ladder logic programming looks, well, like a ladder. It's more like a flow chart than a program. There are two vertical lines coming down the programming environment, one on the left and one on the right. Then, you have rungs of conditionals on the left that lead to outputs on the right. For example:
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Now Ladder has been rewritten in Java and can be played on most of today's computers. This version includes all the original levels and several new ones. It ... comes with a level editor so that you can make your own.
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