Baldor MN1928 Digital I/O, Digital inputs, Input / Output, General purpose inputs

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4.4 Digital I/O

The NextMove ES provides:

H20 general purpose digital inputs.

H12 general purpose digital outputs.

4.4.1Digital 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:

H5V digital inputs with internal pull-up resistors. Can also be assigned to special purpose functions such as Home, Limit, Stop and Error inputs.

HSampling frequency: 1kHz.

DIN0

DGND

NextMove ES

+5V

10k

c21

1nF

a3

74AHCT14

MintMT

INX.0

GND

Figure 7 - 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.

4.4.1.1General 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.

MN1928 Input / Output 4-7