Glossary-II
DH-485 Link Data Highway 485 link. An Allen-Bradley token-passing baseband link for a local
area network based on the RS-485 standard.
Disable To inhibit logic from being activated.
Duty Cycle The relationship between the operating and rest times or repeatable operation at
different loads.
Enable To allow an action or acceptance of data by applying an appropriate signal to the
appropriate input.
Fault Any malfunction that interferes with normal system operation.
G File G File configuration is based on the devices that you have on the RIO link. G File
configuration consists of setting logical device starting addresses and the logical
device image size of each physical device/adapter with which the scanner
communicates.
Gate The control element of an SCR (silicon controlled rectifier) commonly referred to
as a thyristor. When a small positive voltage is applied to the gate momentarily, the
SCR will conduct current (when the anode is positive with respect to the cathode
of the SCR). Current conduction will continue even after the gate signal is
removed.
Jogging Jogging is a means of accomplishing momentary motor movement by repetitive
closure of a circuit using a single push button or contact element.
Jumper A short conductor with which you connect two points.
LCD Liquid crystal display, which is a reflective visual readout device commonly used
in digital watches and laptop computers.
Locked Rotor Torque The minimum torque that a motor will develop at rest for all angular positions of
the rotor (with rated voltage applied at rated frequency).
Mode A selected method of operation. Example: run, test, or program.
Normally Closed Contacts A set of contacts on a relay or switch that are closed when the relay is de-energized
or the switch is de-activated. They are open when the relay is energized or the
switch is activated.
Normally Open Contacts A set of contacts on a relay or switch that are open when the relay is de-energized
or the switch is de-activated. They are closed when the relay is energized or the
switch is activated.
PLC
®
Controller 1. An Allen-Bradley programmable controller.
2. An Allen-Bradley programmable controller with a name that includes the
letters PLC. See Programmable Controller.
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