Rockwell Automation Chassis Models - Manual (Page 11)

Chassis Models October 2005 – Issue 4 11
Triguard SC300E Chassis Models
TECHNICAL DESCRIPTION
PHYSICAL
The chassis box has two side plates with flanges to enable 19 inch rack mounting, they are
bolted to top and bottom plates and to a multilayer printed board backplane that carries all
module connections and interconnections. The top and bottom plates are perforated to
facilitate cooling. The plates also carry guides for the I/O modules and support vertical
partitions separating and screening the I/O modules from the power supplies and the
processors. The front edges of the top and bottom plates are flanged to engage the
insertion/ejection levers on the modules and the flanges have guide marks to assist module
insertion. The PSU slots have guide pins at the lower right and, if the chassis is an ac variant,
ac power supply studs at the upper left to prevent the insertion of dc power units.
Mechanical coding blocks
All Input/Output modules carry two mechanical coding blocks equipped with pins which mate
with holes in corresponding blocks in the chassis and prevent the module being inserted into
the wrong slot. The pins in the module coding blocks are factory installed in a pattern
determined by the module and corresponding set screws are removed from the chassis coding
blocks to enable fitting. Unused holes are plugged with set screws.
The chassis mechanical coding block configurations are given in Table 2-1.
Figure 2-1 shows an unpopulated chassis but the presence of ac power supply studs signifies
that it is an ac variant. In a main chassis the three right hand slots would contain processors,
for other variants they would contain the modules detailed in Table 1-1.