NPM PPCI7443, User Manual

Page: 169 / 183

Function Library
•
161
6.16 Position Compare and Latch
@ Name
_7443_set_ltc_logic – Set the LTC logic
_7443_get_latch_data – Get latched counter data
_7443_set_soft_limit – Set soft limit
_7443_enable_soft_limit – Enable soft limit function
_7443_disable_soft_limit – Disable soft limit function
_7443_set_error_counter_check – Step-losing detection setup
_7443_set_general_comparator – Set general-purposed comparator
_7443_set_trigger_comparator – Set trigger comparator
_7443_set_trigger_type – Set the trigger output type
_7443_check_compare_data – Check current comparator data
_7443_check_compare_status – Check current comparator status
_7443_set_auto_compare – Set comparing data source for auto loading
_7443_build_compare_function – Build compare data via constant interval
_7443_build_compare_table – Build compare data via compare table
_7443_cmp_v_change – Speed change by comparator
_7443_set_enable_inp – Set latch signal
@ Description
_7443_set_ltc_logic():
This function is used to set the logic of latch input. This function is
applicable only for last two axes in every PPCI7443 card.
_7443_get_latch_data():
After the latch signal arrived, this function is used to read the latched
value of counters.
_7443_set_soft_limit
():
This function is used to set the value of soft limit.
_7443_enable_soft_limit
(),
_7443_disable_soft_limit()
:
These two functions are used to enable/disable the soft limit function.
Once enabled, the action of soft limit will be exactly the same as
physical limit.
_7443_set_error_counter_check()
:
This function is used to enable the step losing checking facility. By
giving an tolerance value, the PPCI7443 will generate an interrupt
(event_int_status , bit 10) when position error counter exceed
tolerance.
_7443_set_general_comparator
():
This function is used to set the source and comparing value for
general comparator. When the source counter value reached the
comparing
value, the PPCI7443 will generate an interrupt
(event_int_status , bit 11).
_7443_set_trigger_comparator():
This function is used to set the comparing method and value for
trigger comparator. When the feedback position counter value
reached the comparing value, the PPCI7443 will generate trigger a