7 Functional Description of the Fieldbus Modules
7-2
In order to achieve a good system performance the module bus of the AC 800F is
closely linked with that of the CPU. Nevertheless the module can be replaced or
extended while the system is running.
When adding a fieldbus module to or removing one from the AC 800F, perform the
following three steps.
• Plug in the module
• Switch on the module by moving the slide lock to the left hand side.
• Load drivers and functional modules to integrate the module into the control
system.
When plugging a fieldbus module into the AC 800F for the first time, note that there
may be electrostatic discharge from the module which may cause malfunctions of the
AC 800F electronics.
To avoid damage resulting from electrostatic discharge (ESD), proceed as
described below when installing or replacing a module. Note that this procedure
is mandatory:
• Remove either the already installed module to be replaced or the cap (dummy
panel AM 895F) from the appropriate slot.
• Establish a good electrical contact between a passive part of the housing and the
special ESD protection bag in which the module has been delivered to you.
• Take the new fieldbus module out of the bag. Do not touch the board. Only touch
the module front panel.
• Insert the fieldbus module into the AC 800F slot. There are contacts on the upper
and lower edge of the board which act as high-resistance bridges towards the
housing. This eliminates residual charges that may still exist and avoids
electromagnetic interference.
• Only if the module panel has been fastened to the housing with its upper and
lower screw, it is ensured that the specified EMC requirements are met.
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