Glossary of Terms
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12 Glossary of Terms
12.1 Glossary
This part describes some basic concepts that are used throughout the complete document and have very
specific meanings.
System
A system comprises one or more Tightening Controllers linked together. A system works autonomously,
performing a tightening task.
Station
Within a system there is one or more stations. A station controls the tightening of one or more bolts. It has
a PLC to control the tightening cycles.
Bolt
A bolt is the object that will be tightened by the system.
Spindle
A spindle performs the actual tightening of a bolt. It normally comprises:
ï‚· Motor
ï‚· Torque sensor
ï‚· Angle sensor
Often one bolt is tightened with one spindle, but it is possible to configure the system so several bolts are
tightened with one spindle.
Program, steps and sequences
How the tightening of the bolt should be done is described in a tightening program. The program
comprises steps, each describing how a part of the tightening cycle should be performed.
A number of steps can be saved as a sequence. When building a new tightening program, or altering an
existing one, it is possible to insert sequences.
Mode
When a tightening cycle is started, the choice of tightening program is done using the Mode signal in the
PLC. With use of a mode table it is defined which tightening program that should be used for each of the
specific bolts in each mode. Each station in a system has its own unique Mode table.
Cycle
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