Section 3 Modules Battery
M&I – AC 900F Controller 33
SD card reader
The SD card reader is used for data backup, for restoring the application as well as
for updating the firmware. All high-quality SD cards with up to 32 GB are
supported. With an appropriate adapter, micro SD cards can be used as well.
Battery
The optional battery serves for saving the SRAM contents (e.g. process and
configuration data) in the event of power failure and to supply the real time clock.
The CPU module monitors the battery status (capacity). A low battery capacity
warning is displayed before data storage is at risk (about 2 weeks in advance). Upon
this warning message, the battery should be replaced as soon as possible. For more
detailed information, please refer to Section 4, Accessories.
Display unit
The PM CPU module supports the TD 951F display as an optional accessory.
Remove the front panel to install the display unit to the PM CPU module. For more
detailed information, please refer to Section 4, Accessories.
CI/CM PROFIBUS modules
The AC 900F is designed for operation with different PROFIBUS communication
interfaces like the CI 930F, CI 773F and CM 772F that can be connected on the left
side of the PM CPU module.
PROFIBUS communication interfaces ensure communication via the PROFIBUS-
DP fieldbus. The internal coupler bus connects the CI/CM with the CPU module.
This applies to data and power supply. A dual-port RAM is used for data exchange.
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