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Disclaimer: This document is written in the hope that you can utilize for your own education to gain knowledge of PLC systems (should you decide to utilize this document). Although I believe the information in this document to be accurate, it is YOUR responsibility to verify this information before implementing it in any way, especially when damage to personnel or equipment could result. By continuing to read this document, you agree to hold no one who writes, modifies, or distributes this document liable in any way (even negligence). Due to the wide variety of plant applications, some of the examples in this document may be prohibited at your location, or could cause damage to equipment, or harm personnel.
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Glossary of Terms


General Terms


Local Chassis: The local chassis for a particular processor is the chassis the processor resides in.


SERCOS: Serial Real-Time Communication System. This is the fiber optic communication system that allows high speed communication between the SERCOS interface module in the chassis, and a motion drive which controls the servo motor.




Motion:



Average Velocity: The average of the last given amount samples of velocity as it was registered on the feedback element.


Axis: The segment of equipment to which motion is applied.


Backlash: The amount of distance a motor might travel before engaging a load. For example: When a gearbox changes direction, there may be some amount of travel or 'play' before the load is actually engaged.


Bandwidth: The maximum speed of the motion system. Limiting factors include the maximum speed of the encoder, motor, or drive.


Encoder: A feedback device using a grid and optical sensors to indicate the position of an axis.


Homing: The process of returning the system to the state at which absolute moves are initially referenced from.


Incremental Move: A move that is referenced from the current position.


Absolute Move: A move that is referenced from the home position.


Software:


RSLinx: This is the communication server used with most Rockwell Software products. RSLinx pulls information from the processor and passes the information to any application that needs it such as RSView, RSLogix, Visual Basic, or a spreadsheet such as OpenOfficeCalc or Excel.


RSLogix 5000: This is the application used to monitor and program the ControlLogix processor.