Appendix B Glossary - GE VersaPoint IC220PBI002 User Manual

B
dangerous contact voltage. The end plate is supplied together with the bus
terminal and does not need to be ordered separately.
FE functional earth ground
Full duplex Simultaneous sending and receiving of data.
Functional earth ground A low impedance path between electrical circuits
and earth for non-safety purposes such as noise immunity improvement.
Host system A control or computer system.
In process data Data which is transmitted from a device to an application
program is IN process data for this application program.
Input Connection point of a circuit or a device where a signal to be
processed, amplified, stored or linked with other signals can be connected .
Input address area The input address area is an area in which the devices
store their data for the control system.
Input data Input data is data that is transmitted from a device to an
application program.
I/O circuit The I/O circuit (Us+, Us-) begins at the NIU and is carried
through all subsequent modules until the next power terminal. It supplies all
modules that do not need to be isolated from the I/O voltage.
I/O module I/O modules connect to the sensors and actuators.
Logic circuit All connected modules are supplied through the logic circuit
with communications power This circuit starts at the NIU and is carried
through all VersaPoint modules.
Main circuit The main circuit supplies the VersaPoint station with the main
power (U ). The main circuit starts at the NIU or power terminal and is led
M
to the next power terminal.
Master The master is a central device which controls the bus access. All
other devices operate as slaves.
Network A network is a communications link that connects devices
together. The link operates under a protocol understood by all devices.
Out process data Data which an application program sends to a device is
OUT process data for this application program.
Output address area The output address is an area in which the control
system stores data which is to be transmitted to the devices.
Potential routing The potentials are routed over an electrical contact in a
VersaPoint station that is automatically established when the terminals are
properly installed on the mounting rail.
GFK-1911B

Appendix B Glossary

B-3