GE VersaPoint IC220PBI002 User Manual page 168

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1-wire termination Wire termination method for I/O modules with one
termination connection per point. This conductor transfers the signal. I/O
module and sensor or actuator must have the same potential.
2-wire termination Wire termination method for I/O modules with two
termination connections per point. One conductor transfers the signal and
the other the shared potential.
3-wire termination Wire termination method for I/O modules with three
termination connections per point. One conductor transfers the signal, one
the shared potential, and the third one another shared potential (for
instance, shield or earth ground).
4-wire termination Wire termination method for I/O modules with four
termination connections per point. One conductor transfers the signal, one
the shared potential, and the third and fourth are intended for shield and
ground connection.
Actuator An actuator is a device that can influence the behavior of a
process and thereby cause a change in the process variables. Actuators
are, for example, lamps, switches, etc.
Address The address defines a certain memory location. Data can be
written to this location or read when the memory location is accessed.
Analog input An analog input is an input for receiving analog signals.
Analog output An analog output is an output that makes analog signals
available.
Connector The connector is snapped onto the electronics base of the
VersaPoint module.
Connector coding/ keying With VersaPoint you can prevent the mismating
of connectors by encoding/ keying the base and the connector.
Cycle time The cycle time is the time the system needs to read all data
from the connected devices and to write data to all connected devices.
Diagnostic LEDs Diagnostic LEDs provide information on the status of the
station.
Electrical isolation Electrical isolation means that the circuits of an
electrical device are galvanically separated from each other.
End clamp In a VersaPoint station, the end clamps are placed on the
mounting rail on the left-side of the bus interface unit module and after the
last module to prevent the module from sliding side ways.
End plate The end plate terminates a VersaPoint station. It has no electrical
function. It protects the station against ESD pulses and the user against
B-2 VersaPoint™ I/O System Profibus-DP NIU User's Manual – August 2005 GFK-1911B