Talk:Programmable logic controller: Difference between revisions

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{{afd-merged-from|List of programmable logic controller manufacturers|List of programmable logic controller manufacturers|23 November 2020}}

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== Pneumatic and mechanical PLC's ==

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== I don't understand the diagram in [[Programmable logic controller#Example]] ==

Why are there two "Fill Valves"? I thought only the high level and low level switches are meant to be the inputs, so why is there a "Fill Valve" input? Also, isn't the high level switch meant to be a cutoff?--[[User:Alasdair|<fontspan facestyle="font-family:Comic sans MS"; color=":ForestGreen;"><b>Alasdair</b></fontspan>]] 12:57, 25 September 2009 (UTC)

:That isn't an input, it is the output being used as a contact. The purpose is to "latch" the "Fill Valve" output on. Without this, the output would turn off (or worse - jitter) when the water level raises above the low level switch. [[User:Krushia|Krushia]] ([[User talk:Krushia|talk]]) 14:26, 26 September 2009 (UTC)