Siemens Simovert Masterdrives Compendium page 251

Functions
B0869: SW_E_PLUS
Minus software limit
switch
B0888: ARFD axis
referenced
NOTE
CAUTION
7-42
The binector will only be set HIGH when the software limit switches are
active (approached); the movement has been limited by the Minus
software limit switch.
Positioner/correction value and homing
The binector is only set HIGH following a successful homing operation
(valid measurement in the enabled travel direction [REF_D] taking
account of the masking window function or active correction
performed).
The signal remains HIGH until the ARFD binector is reset through
REF_ON being set again.
The signal will automatically be reset if there is a POWER-OFF on the
converter or [REF] is set again, unless an absolute value encoder is
present (i.e. [ARFD] remains HIGH following the first valid reference
mark if [REF] is on and a number of coarse pulses have been received
(reference mark).
The signal is not continuously set to HIGH in the case of absolute value
encoders.
If an absolute value encoder is used, the software limit switches which
require the signal [ARFD] = High at U863.2 for their activation, can be
activated by manually setting the signal to high at U863.2.
The user is responsible for monitoring the signal and ensuring the
appropriate interlocks are in place!!!
6SE7087-6QX70 (Version AK)
Compendium Motion Control
09.2008
Siemens AG
SIMOVERT MASTERDRIVES