M&I – AC 900F Controller 109
Section 8 Service
This section provides information on maintenance and service operations. As far as
the display unit is required for this purpose, its operation is also described.
Module replacement
Unless otherwise specified, the modules must be de-energized prior to connection or
disconnection. Make sure to switch off the DC-IN operating voltage, the UP process
voltage and additional voltage supply sources, if any.
CI communication interfaces
There are several possibilities to connect or disconnect a communication interface
to/from a C1/C2 slot without disturbing the CPU module.
AC 900F in de-energized state
After having de-energized the controller, press on the lock at the top of the CI/CM
communication interface and disconnect the module from the slot.
AC 900F in energized state
The CI 930F and CI 773F PROFIBUS communication interfaces are designed for
hot plug (connection/disconnection when energized). Make sure that the
communication interface concerned is deactivated prior to
connection/disconnection. There are two different methods available for this
purpose:
• using the TD 951 display unit. For more detailed information on the menu
operation, please refer to
F1 - Module exchange on page 117
• using a PC (terminal program) via the DIAG diagnostic interface.
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