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4-6 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 5V 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: 1kHz.
DGND
DIN0
GND
MintMT
INX.0
+5V
NextMoveES
10k
74AHCT14
1nF
c21
a3
Figure 6 - General purpose digital input - DIN0 shown
CAUTION: Do not connect 24V 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 1ms
(one software scan) to guarantee acceptance by MintMT. 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 MintMT 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 MintMT help file.