Glossary-4
FM 351 Positioning Function Module
EWA 4NEB 720 6001-02
The resolution is determined from the ratio of the machine data:
Displacement per encoder revolution
Pulses per encoder revolution.
The resolution is a measure of the accuracy of the positioning. It also deter-
mines the possible maximum traversing range.
When the drive reaches the reversing switch, the traversing direction is re-
versed.
The characteristic feature of a rotary axis is that after one revolution of the
axis the actual value is again reset to “0” or to the value “End of rotary axis”.
The “Seek-reference-point mode” synchronizes the pulse counter in the posi-
tioning module to the axis.
The setting “Set actual value” allocates a new coordinate in the system of
units to the current encoder value.
The setting “Set reference point” synchronizes the axis.
Settings are functions in the FM 351 Positioning Function Module for:
Setting a reference point.
Setting an actual value.
Single settings switch the FM 351 Positioning Function Module into a state
in which you:
Can start a loop traverse.
Cannot evaluate the enable input.
Can switch off the software limit switches.
Single-turn encoders are absolute encoders. The resolution is determined by a
coded disk.
The working range on the axis is defined by the software limit switches.
The software limit switch End defines the end of the working range on the
axis.
Resolution
Reversing Switch
Rotary Axis
Seek-Reference-
Point Mode
Set Actual Value
Set Reference
Point
Settings
Single Settings
Single-Turn
Encoder
Software Limit
Switch
Software Limit
Switch End
Glossary
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