ABB S800 I/O User Manual page 65

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All S800 I/O modules are automatically set to the correct addresses by the
ModuleBus interconnection scheme.
The FCI module station address should be set to the assigned PROFIBUS-DP or
Advant Fieldbus 100 station number set by the station address switches. Refer to
or
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of address switches.
The ModuleBus Modem cluster address should be set to the assigned cluster
number by the cluster address switch. Refer to Section 1.2.1.6, TB820 ModuleBus
Modem.
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The level of workmanship must be judged case by case, and the results will
determine the need for a check of all connections before the system is powered up.
It is possible to check, with a buzzer, that the external wiring to the process
equipment is correct and that all conductors are intact. The check of the field wiring
should be done before the I/O modules are installed. It is also possible, without
activating the control equipment, to check that transmitters, transducers and
actuators (including all process wiring) to see if they function correctly. This makes
it necessary to connect voltage to these units and develop suitable checking
methods.
An alternative method, is to make an integrated check of the process equipment,
wiring and the corresponding controller functions. This should be done on a point
by point basis. Preferably the controller should be loaded with the application data
base. The data base is then used as one check-point. Status / values can be read and
control signals to process devices can be simulated by an operator station.
Be aware of the risk of "accidents". Short-circuit and over-voltage can damage the
equipment, for example, a process I/O board or field element
3BSE 020 923R101 55