Electric Company Computer Drive User Manual

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5-8 Input / Output MN1942
NextMove e100 / controller
Mint
OUTX.0
10k
DOUT0
USR
GND
1
10
UDN2982
User
supply
24V
User
supply
GND
USR V+
9
‘X11’
DIN1+
MicroFlex e100
DIN1-
‘X3’
16
6
TLP115A
10
Shield
Connect overall
shiel d at one end only
Figure 29 - Digital input - typical connection from a Baldor NextMove e100
5.2.4 Special functions on inputs DIN1 and DIN2
DIN1 and DIN2 can be configured to perform special functions.
5.2.4.1 Fast position capture
DIN1 or DIN2 can be configured using the FASTSELECT keyword to become a fast latch input.
This allows the position of the axis to be captured in real-time and read using the Mint keyword
FASTPOS.orFASTENCODER. The input can configured using the FASTLATCHEDGE keyword to
be triggered either on a rising or falling edge. Further control of position capture is provided by the
FASTLATCH and 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
latency may be up to 62.5µs, resulting from the 16kHz sampling frequency used for these types
of feedback device. 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.
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.