Rockwell Automation Allen-Bradley AADvance T9110, Solutions Handbook

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42 Rockwell Automation Publication ICSTT-RM447M-EN-P - July 2019
Chapter 2 The AADvance Safety Controller
Corrective Maintenance and Module Replacement
Scheduled maintenance consists of checking the I/O Module calibrations and
proof tests. Detailed scheduled and corrective maintenance information is
given in the AADvance Troubleshooting and Maintenance Manual Doc No:
ICSTT-RM406. Corrective maintenance is by module replacement and where
required fuse replacement in Termination Assemblies. In dual and triple
modular redundant configurations, you can remove a module and install a new
one without interrupting the system operation. In simplex configurations
removing a module will interrupt the system operation. However, certain
restrictions apply on module replacement timing for Safety Related systems
(see the AADvance Safety Manual - ICSTT-RM446 for guidance).
Field connection wiring is attached at the connectors on the termination
assemblies. Ethernet and Serial data connections are made at the T9100
Processor Base Unit. There are no physical links needed to be set up on any
modules or base units. Standard modules are used for all the different
configurations.
Processor Back-up Battery
The 9110 processor module has a back-up battery that powers its internal Real
Time Clock (RTC) and a part of the volatile memory (RAM). The battery
only supplies power when the processor module is no longer powered from the
system power supplies. The specific functions that the battery maintains on
complete loss of power are:
• Real Time Clock - The battery supplies power to the RTC chip itself.
• Retained Variables - Data for retained variables is stored at the end of
each application scan in a portion of RAM, backed up by the battery. On
restoration of power' the retained data is loaded back into the variables
assigned as retained variables for use by the application.
• Diagnostic logs - The processor diagnostic logs are stored in the portion
of RAM backed by the battery.
The battery has a design life of 10 years when the processor module is
continually powered; for processor modules that are un-powered, the design
life is up to 6 months. Battery design life is based on operating at a constant
25°C and low humidity. High humidity, temperature and frequent power
cycles will shorten the operational life of the battery.
IMPORTANT Processor modules must be replaced with a module containing
the same firmware revision, you cannot use processor modules
with different firmware revisions on the same controller.