The PLC base unit provides a means of housing and connecting the installed I/O. Modular base units have slots for interchangeable I/O connections to the backplane's data bus. DirectLOGIC 405 PLC modular bases come with 4, 6 or 8 slots and have local expansion capabilities.
It is important to understand the installation requirements for your DL405 system. This will help ensure that the DL405 products operate within their environmental and electrical limits.
There is a minimum of 2" (50mm) clearance required between the panel door or any devices mounted in the panel door and the nearest DL405 component.