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5-8 Input/ Output MN1942
NextMovee100 / controller
Mint
OUTX.0
10k
DOUT0
USR
GND
1
10
UDN2982
User
supply
24V
User
supply
GND
USRV+
9
‘X11’
DIN1+
MicroFlexe100
DIN1-
‘X3’
16
6
TLP115A
10
Shield
Connectoverall
shieldat one end only
Figure29 - Digitalinput- typicalconnection from a Baldor NextMove e100
5.2.4 Specialfunctions on inputs DIN1and DIN2DIN1and D IN2 can be configured to perform special functions.
5.2.4.1 F ast position capture
DIN1or DIN2can be configured using the FASTSELECT keyword to become a fast latc h input.
Thisallow s the position of the axis to be captured in real-time and read usingthe Mint keyword
FASTPOS.orFASTENCODER.The inputc an configured using the FASTLATCHEDGE keywordto
betriggered either on a rising or falling edge. Further cont rolof pos itionc apture is provided by the
FASTLATCHand FASTLATCHMODE keywords.
The maximum latency to read the fast position depends on the feedback device. For an
incremental encoder, the latency is approximately 150 - 300ns. For other feedback devices
latencymay beup to 62.5µs, res ulting from the 16kHz sampling frequency us ed for these types
offeedback device. The fast interrupt will be latched on a pulse width of about 30µs, although a
width of 100µs is recommended to ensure c apture. Toprevent subsequent inputs causing the
capturedv alue to be overwritten, the interrupt is latched in software.
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 fas t inputs. This could cause
unwantedmultiple tr iggering.