Rockwell Automation 1757-BEM ProcessLogix Battery Extension Module Installation Instructions - Manual (Page 7)

ProcessLogix Battery Extension Module 7
Publication 1757-IN093B-EN-P - April 2004
RIUP Support
You can insert and remove the 1757-BEM while under power, i.e., supports RIUP. The
battery pack is accessible only when the module is out of the chassis.
Available Battery Power
Battery power is available to all slots in the chassis via pin D14 on the ICP backplane. In
theory, the number of sink modules allowed in one chassis is limited only by the number of
slots in a given chassis. Keep in mind that the module will supply at most 1200mAh. For two
modules, each drawing 5mA, the BEM will be able to maintain the memory contents of the
two modules throughout one weekend (5PM Fri. to 8AM Mon.).
Battery Pack
The battery pack is a prefabricated unit consisting of three, series-connected, high
temperature, sub-C size NiCd cells, shrink-wrapped, with a 2-wire harness to a polarized
plastic connector. The advantages of this approach are:
• easier handling than multiple, loose batteries
• eliminates the possibility of unintentionally reversed installation
• provides easy method for disconnecting the battery for shipping and storage
A battery pack is shipped with every 1757-BEM unit but the battery pack does not come
installed in the unit. You must install the battery pack as part of the module installation.
WARNING
If you connect or disconnect wiring while the field-side power is on, an
electrical arc can occur. This could cause an explosion in hazardous
location installations. Be sure that power is removed or the area is
nonhazardous before proceeding.
Removal and Insertion Under Power (RIUP):
• 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.
• 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.
Removable Terminal Blocks (RTB) for I/O connections:
• When you connect or disconnect the Removable Terminal Block
(RTB) with field side power applied, an electrical arc can occur. This
could cause an explosion in hazardous location installations.
• Be sure that power is removed or the area is nonhazardous before
proceeding.