Rockwell Automation 1756-DHRIO ControlLogix Data Highway Plus-Remote I/O Communication Interface Module I.I. - Manual (Page 9)

ControlLogix Data Highway Plus-Remote I/O Communication Interface Module 9
Publication 1756-IN003D-EN-P - July 2008
Determine Module Slot Location
The figure below shows chassis slot numbering in a 4-slot chassis. Slot 0 is the
first slot and is always the leftmost slot in the rack (the first slot to the right of
the power supply). You can use any size ControlLogix chassis and install the
module in any slot. You can also install multiple 1756-DHRIO modules in the
same chassis. You can install as many modules as your power supply can
accommodate, that is, number for which the power supply is rated.
Install or Remove the Module While Power Is Applied
You can install or remove the module while chassis power is applied if you
observe the following precautions.
Be sure that power is removed or the area is nonhazardous before proceeding.
Repeated electrical arcing causes excessive wear to contacts on both the
module and its mating connector. Worn contacts may create electrical
resistance that can affect module operation.
WARNING When you insert or remove the module while backplane power is on, an
electrical arc can occur. This could cause an explosion in hazardous location
installations.
Chassis
Power
Supply
Slot 0
Slot 1 Slot 3
Slot 2
43235