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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.
Plan for safety The catalog and Web page
information should never be used as a replacement for the user
manual. The user manual, D4-USER-M, contains important safety
information that must be followed. The system installation should
comply with all appropriate electrical codes and standards.
Base dimensions and mounting orientation Use
the diagrams provided to make sure the DL405 system can be installed
in your application. To ensure proper airflow for cooling purposes,
DL405 bases must be mounted horizontally. It is important to check
these dimensions against the conditions required for your
application. For example, it is recommended that you leave 1.5"
depth for ease of access and cable clearance. However, your distance
may be greater or less. Also, check the installation guidelines for
the recommended cabinet clearances.
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.
Specifications and Rating
Storage temperature - -4°F - 158°F (-20°C to 70°C)
Ambient operating temperature - 32°F - 140°F (0° to
Four, six, and eight-slot bases The DL405
product family offers four, six, and eight-slot I/O bases.
Expansion units The expansion units are only
necessary when you want to use local expansion. They are installed
in the CPU slot of the expansion bases. They appear very similar to
CPUs, but they only contain a power supply. One of the most often
asked questions for the DL405 family is, "Does the CPU consume an
I/O slot?" The answer is no. The CPU has a special slot in the base
and does not consume any of the available I/O slots. The same is
true for Expansion Units (D4-EX, D4-EXDC) and the
Remote Slave Units (D4-RS). An expansion cable is required to
connect each of the expansion bases to the CPU base (D4-EXCBL).
D4-450 and ï¿½1 bases In the past, a DL405
system has been limited to only accepting specialty modules in the
local CPU base. The ï¿½1 bases must be used with the D4-450 CPU to
remove this limitation. The part numbers for the new bases are
D4-04B-1, D4-06B-1, and D4-08B-1. (Note: you
cannot simply add a ï¿½1 base to an existing system to gain
specialty modules in expansion bases. Instead, you must replace
the CPU and all other expansion bases as well.) You can
add the ï¿½1 bases in an existing system, but they are subject to the
limitations of the regular bases.