Glossary-5
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
The software limit switch Start defines the start of the working range on the
axis.
The SSI encoder is a subset of the absolute encoders. With the SSI encoder
the data is transferred serially.
The standstill monitoring reacts when the standstill range has been left with-
out a traverse movement starting.
The standstill range is a symmetrical range about the target.
The undercutting of the standstill speed indicates to the positioning module
that the position being approached has been reached.
The switchover difference is the difference in displacement between the
switchover point and the target.
The drive switches over from rapid to creep speed at the switchover point.
The switch-off difference is the difference in distance between the switch-off
point and the target.
The drive is switched off a certain displacement interval (switch-off differ-
ence) before the target - at the switch-off point. This ensures exact position-
ing of the load.
Switch-off point positioning is characterized by a target position, switch-off
points, a traverse range and parameters which determine the sequence of
positioning.
Synchronization means that the pulse counter in the positioning module is
matched to the axis.
The machine data ’system of units’ defines the units for the data input and
output.
The target is the absolute or the relative position on the axis which is to be
approached during a positioning process. The target is located within the tar-
get range.
Software Limit
Switch Start
SSI Encoders
Standstill
Monitoring
Standstill Range
Standstill Speed
Switchover
Difference
Switchover Point
Switch-Off
Difference
Switch-Off Point
Switch-Off Point
Positioning
Synchronization
System of Units
Target
Glossary
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