Baldor iMN1921 installation manual Digital I/O, Digital inputs

4.5 Digital I/O

The NextMove ST provides:

H24 general purpose digital inputs.

H16 general purpose digital outputs.

Note: It is recommended to use separate shielded cables for the digital inputs. The shield should be connected to the input connector’s shield pin.

4.5.1Digital inputs

The digital inputs are available across a range of connectors, as shown in section 4.1.1. All digital inputs have a common specification:

HGeneral purpose 5V TTL digital inputs with internal pull-up resistors. Can also be assigned to special purposes such as Home, Limit, Stop and Error inputs.

HSampling frequency: 1kHz

DIN0

DGND

3

2

+5V

10k

1nF

NextMove ST

74AHCT14	MintMT
	INX.0
	GND

Figure 12 - General purpose digital input - DIN0 shown

CAUTION: Do not connect 24V signals to the digital inputs.

These are unprotected inputs connected directly to 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.

The 24 general purpose digital inputs can be shared between axes and can be configured using WorkBench v5 (or the Mint keywords beginning INPUT...) to determine their active level and other properties. The state of individual inputs can be read directly using the INX keyword. See the MintMT help file.

MN1921 Input / Output 4-11