Applied-motion BLuDC4-Q Manual de usuario descargar pdf (Pagina 18)

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BLuDC-S,-Q Hardware manual

Other Digital Inputs

As we mentioned in the previous section, the high speed

STEP/PWM and DIR inputs are configured for five volt logic.

All other digital inputs are designed for operation between 12

and 24 volts DC. This includes five inputs on the main

board and the eight digital inputs on the Si™ board.

Single Ended Inputs

The BLU servos include single ended, optically isolated

input circuits that can be used with sourcing or sinking

signals, 12 to 24 volts. This allows connection to PLCs,

sensors, relays and mechanical switches. Because the input circuits are isolated, they require a

source of power. If you are connecting to a PLC, you should be able to get power from the PLC

power supply. If you are using relays or mechanical switches, you will need a 12-24 V power

supply. This also applies if you are connecting the inputs to the programmable outputs of an Si

product from Applied Motion.

What is COM?

"Common" is an electronics term for an electrical connec-

tion to a common voltage. Sometimes "common" means

the same thing as "ground", but not always. In the case of

the BLU Servo, if you are using sourcing (PNP) input

signals, then you will want to connect COM to ground

(power supply -). If you are using sinking (NPN) signals,

then COM must connect to power supply +.

Note: If current is flowing into or out of an input, the logic

state of that input is low or closed. If no current is flowing,

or the input is not connected, the logic state is high or

open.

The diagrams on the following pages show how to connect

the inputs to various commonly used devices.

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