Autodesk autocad electrical 2005 Quick Setup Guide

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4
PLC
Programmable Logic Controller (PLC) modules are built 
dynamically when selected from the menu. From a small 
set of library symbols, hundreds of PLC modules can be 
built on request. This method allows the module to 
conform to the underlying ladder rung spacing, so you 
can add spacers and break the module at insertion time.
About PLC modules
Inserting PLC modules
Removing ladder rungs
Using Fence Insert