Rockwell Automation 1757-BEM ProcessLogix Battery Extension Module Installation Instructions - Manual (Page 4)

4 ProcessLogix Battery Extension Module
Publication 1757-IN093B-EN-P - April 2004
IMPORTANT
The Control Processor contains a non-rechargeable lithium battery
(catalog no. 1757-PLXBAT) that provides memory backup time of 6
days (with a fully-charged battery). Ideally, you should remove the
lithium battery when a 1757-BEM (NI-CD) is also present (to prevent
it from being needlessly depleted), but both may be present in the
controller chassis. If both batteries are present, the BAT LED will turn
red instead of green when the CPM goes through startup diagnostics
and enters the IDLE state.
WARNING
Battery Handling
When you connect or disconnect the battery 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.
For Safety information on the handling of lithium batteries, such as the
1757-PLXBAT, including handling and disposal of leaking batteries, see
Guidelines for Handling Lithium Batteries, publication AG 5-4.
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.