Applied Motion 1240i User Manual

Page 6

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If the sensor output goes low at the limit, select the option “closed”. If the output is

open, or high voltage, choose “open”.

Other sensors have sourcing outputs. That means that current can flow out of the

sensor output, but not into it. In that case, wire the sensor this way:

If the sensor output goes high at the limit, choose the program option “closed”. if

the output is low at the limit, select “open”.

Wiring a Mechanical Limit Switch

You can use normally open or normally closed limit switches. Either way, wire them

as shown here.

Wiring a Limit Sensor

Some systems use active limit sensors that produce a voltage output rather than a

switch or relay closure. These devices must be wired differently than switches.

If your sensor has an open collector output or a sinking output, wire it like this:

1240i

CCW LIMIT+

CCW LIMIT-

CW LIMIT-

5-24

VDC

SUPPLY

CW LIMIT+

1240i

CW LIMIT-

Power

Supply

–

Limit

Sensor

CW LIMIT+

Wiring for Sinking or Open Collector Output

output

–

1240i

LIMIT-

Power

Supply

–

Proximity

Sensor

LIMIT+

Wiring for Sourcing Output

output

–

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Wiring Inputs

The 1240i input circuits can be used with

sourcing or sinking signals, 5 to 24 volts.

This allows connection to many TTL circuits,

PLCs, relays and mechanical switches.

Because the input circuits are isolated, they

require a source of power. If you are con-

necting to an open collector TTL circuit or

to a PLC, you should be able to get power

from the PLC or TTL power supply. If you

are using relays or mechanical switches,

you will need a 5-24 V power supply. This

also applies if you are connecting the 1240i

inputs to another Si product from Applied

Motion, like the Si-100 indexers or the

3540i, Si3540, Si5580, 7080i and Si4500

indexer-drives.

Connecting an Input to a Switch or Relay

Use normally open momentary switch to trigger 1240i using Wait Input instruction.

Use single throw switch for parameter selection using If Input instruction.

Use normally open momentary switch for jogging.

Note: If current is flowing into or out of an 1240i input, the logic state of that input is

low. If no current is flowing, or the input is not connected, the logic state is high.

The diagrams on the following pages show how to connect 1240i inputs to various

devices.

The maximum voltage that can be applied to an input terminal

is 24 volts DC. Never apply AC voltage to an input terminal.

2200

inside 1240i

COM
COM

IN1

IN2

IN3

IN4

JOG CW

JOG CCW

1240i

switch or relay

(closed=logic low)

COM

5-24

VDC

Power

Supply