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4-8 Input / Output
MN1928
4.4 Digital I/O
The NextMove ES provides:
H
20 general purpose digital inputs.
H
12 general purpose digital outputs.
4.4.1 Digital inputs
The digital inputs are available across a range of pins, as shown in section 4.2.1. All digital
inputs have a common specification:
H
5 V digital inputs with internal pull-up resistors. Can also be assigned to special purpose
functions such as Home, Limit, Stop and Error inputs.
H
Sampling frequency: 1 kHz.
DGND
DIN0
GND
Mint
INX(0)
+5V
NextMove ES
74AHCT14
c21
a3
Figure 7 - General purpose digital input - DIN0 shown
Do not connect 24 V signals to the digital inputs.
These unprotected inputs are connected directly to TTL compatible 74AHCT14 devices. If an
input is configured as edge triggered, the triggering pulse must have a duration of at least 1 ms
(one software scan) to guarantee acceptance by Mint. The use of shielded cable for inputs is
recommended.
4.4.1.1 General purpose inputs
The general purpose digital inputs DIN0 - DIN19 can be shared between axes, and are
programmable in Mint (using a range of keywords beginning with the letters
INPUT
... ) to
determine their active level and if they should be edge triggered. The state of individual inputs
can be read directly using the
INX
keyword. See the Mint help file.
A general purpose digital input can be assigned to a special purpose function such as a home,
limit, stop or error input. See the keywords
HOMEINPUT
,
LIMITFORWARDINPUT
,
LIMITREVERSEINPUT
,
STOPINPUT
, and
ERRORINPUT
in the Mint help file.
CAUTION
Servo Systems Co. • 115 Main Road • P.O. Box 97 • Montville, NJ,
07045-0097 • (973) 335-1007 • Toll Free: (800) 922-1103
Fax: (973) 335-1661 • www.servosystems.com
