PI E-871.1A1N, User Manual, Page: 38 / 226

0x14 Has Reference? Do the mechanics have a reference point switch?
Activates respectively deactivates reference
moves to the installed reference point switch.
0 No reference point switch
1 Reference point switch available
0x70 Reference Signal Type Reference signal type.
4.9.10 Limit Switch Detection
The E-871.1A1N receives signals from the limit switch at its axis connector (p. 222) . The LIM?
command can be used to determine whether an axis has limit switches.
The signals from the limit switches (also end-of-travel sensors) of a linear stage are used to
stop the motion prior to the hard stop at both ends of the travel range. In addition,
soft
limits (p. 38) can be set via parameters of the E-871.1A1N.
The limit switch signals can also be used for reference moves. The controller knows the
absolute axis position after a reference move to a limit switch (
reference point
definition (p. 40) ).
The following parameters can be used to configure how the E-871.1A1N detects the limit
switches:
■
Limit Mode (0x18)
■
Has No Limit Switches? (0x32)
■
Use Limit Switches Only For Reference Moves? (0x77)
Commands
L Page
LIM? Indicate Limit Switches 144
Parameters
0x18 Limit Mode Signal logic of the limit switches.
0 pos-HI, neg-HI
1 pos-LO, neg-HI
2 pos-HI, neg-LO
3 pos-LO, neg-LO
0x32 Has No Limit
Switches? Do the mechanics not have limit switches?
Activates motion stop at the installed limit
switches.
0 Mechanics have limit switches
1 Mechanics do not have limit switches
0x77 Use Limit Switches
Only For Reference
Moves? Should the limit switches only be used for
reference moves?
Is intended for use with rotation stages.
Only evaluated when parameter 0x32 has the
value 0.
4.9.11 Travel Range and Soft Limits
The physical limits of the travel range can be represented by the following items of a
positioner:
■
Limit switches
4 PRODUCT DESCRIPTION PZ285EN
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