A-BMicroLogix 1000 Programmable Controllers

any degradation of properties and replace the module if 

degradation is found.

Sécurité

Cet équipement est conçu pour être utilisé dans des environnements de Classe 1, Division 2, 

Groupes A, B, C, D ou non dangereux (si indiqué sur le produit ou l'emballage).

N'utiliser que les câbles de communication suivants dans des environnements dangereux de 

Classe 1, Division 2.

AVERTISSEMENT

!

Danger d'explosion :

• La substitution de composants peut rendre cet équipement 

impropre à une utilisation en environnement de Classe 1, 

Division 2.

• Ne pas remplacer de composants ou déconnecter l'équipement 

sans s'être assuré que l'alimentation est coupée et que 

l'environnement est classé non dangereux.

• Ne pas connecter ou déconnecter les connecteurs lorsque le 

circuit est alimenté, à moins que l'environnement ne soit classé 

non dangereux.

• Ce produit doit être installé dans un boîtier. Tous les câbles qui lui 

sont connectés doivent rester dans le boîtier ou être protégés.

Mounting Your Controller Horizontally

The controller should be mounted horizontally within an enclosure using either the DIN rail 

or mounting screw option. Use the mounting template from the front of this document to 

help you space and mount the controller properly.

Using a DIN Rail

To install your controller on the DIN rail:

1. Mount your DIN rail. (Make sure that the 

placement of the controller on the DIN rail 

meets the recommended spacing 

requirements. Refer to the mounting template 

from the back of this document.)

2. Hook the top slot over the DIN rail.

3. While pressing the controller against the rail, 

snap the controller into position.

4. Leave the protective wrap attached until you 

are finished wiring the controller.

Using Mounting Screws

To install your controller using mounting 

screws:

1. Remove the mounting template from the 

back of this document.

2. Secure the template to the mounting 

surface. (Make sure your controller is 

spaced properly.)

3. Drill holes through the template.

4. Remove the mounting template.

5. Mount the controller.

6. Leave the protective wrap attached until you are finished wiring the controller.

Mounting Your Controller Vertically

Your controller can also be mounted vertically within an enclosure using mounting screws or 

a DIN rail. To insure the stability of your controller, we recommend using mounting screws. 

For additional information, refer to the previous section.

To insure the controller's reliability, the following environmental specifications must not be 

exceeded.

Grounding Your Controller

In solid-state control systems, grounding helps limit the effects of noise due to 

electromagnetic interference (EMI). Run the ground connection from the ground screw of 

the controller (third screw from left on output terminal rung) to the ground bus. Use the 

heaviest wire gauge listed for wiring your controller.

You must also provide an acceptable grounding path for each device in your application. For 

more information on proper grounding guidelines, see the Industrial Automation Wiring and 

Grounding Guidelines, (publication 1770-4.1).

ATTENTION

!

All devices connected to the user 24V power supply or to the RS-232 

channel must be referenced to chassis ground or floating. Failure to 

follow this procedure may result in property damage or personal 

injury.

Chassis ground, user 24V ground, and the RS-232 ground are 

internally connected. You must connect the chassis ground terminal 

screw to chassis ground prior to connecting any devices.

On the 1761-L10BWB, -L10BXB, -L16BWB, -L16BBB, -L16NWB, 

-L20BWB-5A, -L32BBB, and -L32BWB controllers, the ground 

associated with the user supplied 24V DC input power and chassis 

ground are internally connected.

Surge Suppression

Inductive load devices such as motor starters and solenoids require the use of some type of 

surge suppression to protect the controller output contacts. Switching inductive loads 

without surge suppression can significantly reduce the life expectancy of relay contacts. By 

adding a suppression device directly across the coil of inductive devices, you prolong the life 

of the output circuits. You also reduce the effects of radiated voltage transients and prevent 

electrical noise from radiating into system wiring and facility.

The following diagram shows an output with a suppression device. We recommend that you 

locate the suppression device as close as possible to the load device.

If you connect a micro controller FET output to an inductive load, we recommend that you 

use an 1N4004 diode for surge suppression, as shown in the illustration on page 17.

Suitable surge suppression methods for inductive load devices include a varistor, an RC 

network, or, for dc loads, a diode. These components must be appropriately rated to suppress 

the switching transient characteristic of the particular inductive device. See the table on 

page 18 for recommended suppressors.

As the following diagram illustrates, these surge suppression circuits connect directly across