Function library
Positioning control
3.4.8 Homing
3−48
l
EDSVS9332P−EXT DE 2.0
3.4.8.3 Homing status (POS−REF−OK)
The homing status is indicated via the function block output POS−REF−OK" and displayed under
C1284.
The homing status is displayed as "Reference known" when the measuring systems have a defined
reference to the machine. Absolute positioning ( 3−32) or ( 3−33) is only possible after a defined
reference has been created.
The output POS−REF−OK is set if
l homing is completed,
l the program function Set reference" is set,
l the absolute value encoder is selected as position feedback (C0490 = 4).
l Set Fb input POS−ABS−SET = 1.
l C1210 = 2 (absolute positioning with saving)
The output POS−REF−OK is reset by
l Start of homing
l Writing to the following codes:
– C0011 (Nmax)
– C0490 (feedback system for the position controller)
Note:
Please take into consideration that codes C0490 and C0025 have an impact on each other.
A subsequent change of one of the codes overwrites the other.
– C1202 (Gearbox factor, numerator)
– C1203 (Gearbox factor, denominator)
– C1204 (Feed constant)
– C1207/1(Position encoder gearbox factor, numerator)
– C1207/2 (Position encoder gearbox factor, denominator)
– C1210 (Positioning mode)
l The following errors occur:
– NMAX (limit speed from C0596)
– P12 (encoder limit exceeded)
– SD2 (resolver error) if resolver has been selected as position feedback system (C0490=0),
SD7 (absolute value encoder).
l In relative positioning mode (C1210=1) if Prg−reset is carried out during a running positioning
process.
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