Mint NextMove PCI Manual do Utilizador descarregar pdf (Página 34)

Typical Connections

DIGITAL INPUTS

20 digital inputs, user configured for limit, home,stop,

error or general purpose. May be configured as level or

edge triggered, and to interrupt user program and call

subroutine.

FAST POSITION CAPTURE

The first four of the 20 inputs can be used as position

capture inputs, one per servo axis. The position is

latched within 200 nS of an active edge.

HOME

One per axis, taken from the 20 digital inputs. Provides

reference position for the axis.Three modes of homing:

on encoder index, on switch, on both.

LIMIT

One or two per axis, taken form the 20 digital inputs.

Provides end of travel protection. The response to an

active input can be programmed by the user..

DRIVE ERROR INPUT

One per axis, taken from the 20 digital inputs. Brings

all axes to a crash stop when active. Input sense is

software configurable.

INPUT CHARACTERISTICS

The digital inputs use ac opto-isolators and may be

connected to positive or negative common. (for use

with NPN or PNP outputs). These are arranged as one

bank of eight and one bank of twelve each with a

common rail. With the common rail connected to the

positive voltage the inputs can be driven with NPN

drive transistors or low-side switches. Alternatively

they may be driven with PNP drive transistors or high-

side switches when the common rail is connected to

the low voltage.

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Mint NextMove PCI Manual do Utilizador Página 34