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4.3.4 Special functions on DIN4 and DIN5 - fast inputs
II
Flex+Drive
only:
DIN4 and DIN5 can be configured using the FASTSELECT keyword to perform special
functions:
Fast interrupt hardware position capture input. The position of the axis is captured in real
H
time and can be read using the Mint keyword FASTPOS.
Master or auxiliary encoder input capture, read using the Mint keyword
H
FASTAUXENCODER (DIN5 only).
The maximum latency to read the fast position is approximately 1μs. The fast interrupt will be
latched on a pulse width of about 30μs, although a width of 100μs is recommended to ensure
capture. To prevent subsequent inputs causing the captured value to be overwritten, the
interrupt is latched in software. It is necessary to clear the latch before subsequent interrupts
can be detected. See the Mint help file. Both inputs are fitted with Schmitt trigger devices.
Note: The fast inputs are particularly sensitive to noise, so inputs must use shielded
twisted pair cable.
Do not connect mechanical switches, relay contacts or other sources liable to
signal 'bounce' directly to the fast inputs. This could cause unwanted multiple
triggering.
4-8 Input / Output
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MN1902
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