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	<title>PLC programming, tutorial, training, hints and tips.</title>
	<link>http://www.plcprogramming.org</link>
	<description>PLC (Programmable Logic Controllers) programming articles, examples, software, download, simulator</description>
	<pubDate>Thu, 17 Apr 2008 15:09:49 +0000</pubDate>
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		<title>simple AND circuit</title>
		<link>http://www.plcprogramming.org//simple-and-circuit-28/</link>
		<comments>http://www.plcprogramming.org//simple-and-circuit-28/#comments</comments>
		<pubDate>Thu, 13 Mar 2008 10:39:52 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<guid isPermaLink="false">http://www.plcprogramming.org/plc-examples/simple-and-circuit-28/</guid>
		<description><![CDATA[  As a programming example, consider the simple AND circuit shown in Figure 1 consisting of two momentary pushbuttons in series operating a lamp. Although it would be very uneconomical to implement a circuit this simple using a PLC, for this example we will do so.

When we convert a circuit to run on a [...]]]></description>
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		<title>Physical Components vs. Program Components</title>
		<link>http://www.plcprogramming.org/plc-software/physical-components-vs-program-components-27/</link>
		<comments>http://www.plcprogramming.org/plc-software/physical-components-vs-program-components-27/#comments</comments>
		<pubDate>Thu, 13 Mar 2008 10:21:37 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[PLC Software]]></category>

		<category><![CDATA[PLC Hardware]]></category>

		<guid isPermaLink="false">http://www.plcprogramming.org/plc-software/physical-components-vs-program-components-27/</guid>
		<description><![CDATA[When learning PLC programming, one of the most difficult concepts to grasp is the difference between physical components and program components. We will be connecting physical components (switches, lights, relays, etc.) to the external terminals on a PLC. Then when we program the PLC, any physical components connected to the PLC will be represented in [...]]]></description>
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		<title>Typical system components for a modularized PLC</title>
		<link>http://www.plcprogramming.org/plc-hardware/typical-system-components-for-a-modularized-plc-26/</link>
		<comments>http://www.plcprogramming.org/plc-hardware/typical-system-components-for-a-modularized-plc-26/#comments</comments>
		<pubDate>Wed, 05 Mar 2008 08:58:47 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[PLC Hardware]]></category>

		<guid isPermaLink="false">http://www.plcprogramming.org/plc-hardware/typical-system-components-for-a-modularized-plc-26/</guid>
		<description><![CDATA[1. Processor. The processor (sometimes call a CPU), as in the self contained units, is generally specified according to memory required for the program to be implemented. In the modularized versions, capability can also be a factor. This includes features such as higher math functions, PID control loops and optional programming commands. The processor consists [...]]]></description>
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		</item>
		<item>
		<title>PLC Configurations</title>
		<link>http://www.plcprogramming.org/articles/plc-configurations-25/</link>
		<comments>http://www.plcprogramming.org/articles/plc-configurations-25/#comments</comments>
		<pubDate>Wed, 05 Mar 2008 08:55:00 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[PLC Articles]]></category>

		<guid isPermaLink="false">http://www.plcprogramming.org/articles/plc-configurations-25/</guid>
		<description><![CDATA[Programmable controllers (the shortened name used for programmable logic controllers) are much like personal computers in that the user can be overwhelmed by the vast array of options and configurations available. Also, like personal computers, the best teacher of which one to select is experience. As one gains experience with the various options and configurations [...]]]></description>
		<wfw:commentRss>http://www.plcprogramming.org/articles/plc-configurations-25/feed/</wfw:commentRss>
		</item>
		<item>
		<title>Siemens SIMATIC S5</title>
		<link>http://www.plcprogramming.org/plc-hints-and-tips/siemens-simatic-s5-23/</link>
		<comments>http://www.plcprogramming.org/plc-hints-and-tips/siemens-simatic-s5-23/#comments</comments>
		<pubDate>Sun, 25 Mar 2007 14:52:49 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[PLC Hints and Tips]]></category>

		<guid isPermaLink="false">http://www.plcprogramming.org/plc-hints-and-tips/siemens-simatic-s5/23/</guid>
		<description><![CDATA[The digital I/O in Siemens PLCs is arranged into groups of 8 bits, calleda byte (see Appendix). A signal is identified by its bit number (0–7) andits byte number (0–127). Inputs are denoted I&#60;byte&#62;. &#60;bit&#62; and outputsby Q&#60;byte&#62;. &#60;bit&#62;. I9.4 is thus an input with bit address 4 inbyte 9, and Q63.6 is an output [...]]]></description>
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		<title>Allen Bradley PLC-5</title>
		<link>http://www.plcprogramming.org/plc-hints-and-tips/allen-bradley-plc-5-22/</link>
		<comments>http://www.plcprogramming.org/plc-hints-and-tips/allen-bradley-plc-5-22/#comments</comments>
		<pubDate>Sun, 25 Mar 2007 14:50:34 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[PLC Hints and Tips]]></category>

		<guid isPermaLink="false">http://www.plcprogramming.org/plc-hints-and-tips/allen-bradley-plc-5/22/</guid>
		<description><![CDATA[The Allen Bradley PLC-5 can have up to eight racks in its 5/25 version.The rack containing the processor is automatically defined as rack 0,but the designer can allocate addresses of the other racks (in the range1–7) by set-up switches. The racks other than rack 0 connect to theprocessor via a remote I/O serial communications cable.There [...]]]></description>
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		<item>
		<title>PLC Racks, cards and signals</title>
		<link>http://www.plcprogramming.org/plc-hints-and-tips/plc-racks-cards-and-signals-21/</link>
		<comments>http://www.plcprogramming.org/plc-hints-and-tips/plc-racks-cards-and-signals-21/#comments</comments>
		<pubDate>Sun, 25 Mar 2007 14:47:19 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[PLC Hints and Tips]]></category>

		<guid isPermaLink="false">http://www.plcprogramming.org/plc-hints-and-tips/plc-racks-cards-and-signals/21/</guid>
		<description><![CDATA[The PLC program is concerned with connections to the outside plant,and the input and output devices need to be identified inside the program.Before we can examine how the program is written we will first discusshow various manufacturers treat the I/O.
A medium-sized PLC system consists of severalracks, each containing cards, with each card interfacing generally to [...]]]></description>
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		<title>The PLC program scan</title>
		<link>http://www.plcprogramming.org/plc-hints-and-tips/the-plc-program-scan-20/</link>
		<comments>http://www.plcprogramming.org/plc-hints-and-tips/the-plc-program-scan-20/#comments</comments>
		<pubDate>Sun, 25 Mar 2007 14:44:26 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[PLC Hints and Tips]]></category>

		<guid isPermaLink="false">http://www.plcprogramming.org/plc-hints-and-tips/the-plc-program-scan/20/</guid>
		<description><![CDATA[A PLC program can be considered to behave as a permanent runningloop similar to that in Figure (a). The user’s instructions are obeyedsequentially, and when the last instruction has been obeyed the operationstarts again at the first instruction. A PLC does not, therefore, communicatecontinuously with the outside world, but acts, rather, by taking ‘snapshots’.
The action [...]]]></description>
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		<title>The advantages of PLC control</title>
		<link>http://www.plcprogramming.org/articles/the-advantages-of-plc-control-19/</link>
		<comments>http://www.plcprogramming.org/articles/the-advantages-of-plc-control-19/#comments</comments>
		<pubDate>Sun, 25 Mar 2007 14:39:08 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[PLC Articles]]></category>

		<guid isPermaLink="false">http://www.plcprogramming.org/articles/the-advantages-of-plc-control/19/</guid>
		<description><![CDATA[Any control system goes through four stages from conception toa working plant. A PLC system brings advantages at each stage.The first stage is design; the required plant is studied and the controlstrategies decided. With conventional systems design must be completebefore construction can start. With a PLC system all that is needed isa possibly vague idea [...]]]></description>
		<wfw:commentRss>http://www.plcprogramming.org/articles/the-advantages-of-plc-control-19/feed/</wfw:commentRss>
		</item>
		<item>
		<title>PLC - Remote I/O</title>
		<link>http://www.plcprogramming.org/plc-hardware/plc-remote-io-18/</link>
		<comments>http://www.plcprogramming.org/plc-hardware/plc-remote-io-18/#comments</comments>
		<pubDate>Sun, 25 Mar 2007 14:32:45 +0000</pubDate>
		<dc:creator>admin</dc:creator>
		
		<category><![CDATA[PLC Hardware]]></category>

		<guid isPermaLink="false">http://www.plcprogramming.org/plc-hardware/plc-remote-io/18/</guid>
		<description><![CDATA[So far we have assumed that a PLC consists of a processor unit anda collection of I/O cards mounted in local racks. Early PLCs did tend tobe arranged like this, but in a large and scattered plant with this arrangement,all signals have to be brought back to some central point inexpensive multicore cables. It will [...]]]></description>
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