Allen-Bradley MicroLogix 1200 Manual de usuario

Publication 1762-IN016A-EN-P - July 2003

Installation Instructions

MicroLogix™ 1200 Analog Output Module

(Catalog Number 1762-OF4)

Inside…

For More Information................................................................................2

Description................................................................................................3

Installation ................................................................................................3

Mounting...................................................................................................5

System Assembly......................................................................................7

Field Wiring Connections..........................................................................7

Output Type Selection...............................................................................8

Wiring .......................................................................................................8

I/O Memory Mapping .............................................................................11

Specifications .........................................................................................16

Hazardous Location Considerations .......................................................18

Environnements dangereux ....................................................................19

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Publication 1762-IN016A-EN-P - July 2003

For More Information

If you would like a manual, you can:

•download a free electronic version from the internet:

www.ab.com/micrologix or www.theautomationbookstore.com

•purchase a printed manual by:

–contacting your local distributor or Rockwell Automation representative

–visiting www.theautomationbookstore.com and placing your order

–calling 1.800.963.9548 (USA/Canada)

or 001.330.725.1574 (Outside USA/Canada)

For Refer to this Document Pub. No.

Information on installing, wiring, and operating a

MicroLogix 1200 Programmable Controller

MicroLogix 1200 Programmable

Controllers User Manual

1762-UM001

Installation guide for the MicroLogix 1200

Programmable Controller.

MicroLogix 1200 Programmable

Controllers Installation Instructions

1762-IN006

Installation guide for the MicroLogix 1200 Memory

Module and Real Time clock.

MicroLogix 1200 Memory Module and/or

Real Time Clock Installation Instructions

1762-IN001

More information on proper wiring and grounding

techniques.

Industrial Automation Wiring and

Grounding Guidelines

1770-4.1

MicroLogix™ 1200 Analog Output Module 3

Publication 1762-IN016A-EN-P - July 2003

Description

Installation

1762 I/O is suitable for use in an industrial environment when installed in accordance with

these instructions. Specifically, this equipment is intended for use in clean, dry environments

(Pollution degree 2(1)) and to circuits not exceeding Over Voltage Category II(2) (IEC

60664-1).(3)

Item Description Item Description

1a upper panel mounting tab 5 bus connector cover

1b lower panel mounting tab 6 flat ribbon cable with bus connector (female)

2 power diagnostic LED 7 terminal block

3 module door with terminal identification label 8 DIN rail latch

4 bus connector

with male pins

9 pull loop

(1) Pollution Degree 2 is an environment where, normally, only non-conductive pollution occurs except that occasionally a

temporary conductivity caused by condensation shall be expected.

(2) Over Voltage Category II is the load level section of the electrical distribution system. At this level transient voltages are

controlled and do not exceed the impulse voltage capability of the product’s insulation.

(3) Pollution Degree 2 and Over Voltage Category II are International Electrotechnical Commission (IEC) designations.

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Publication 1762-IN016A-EN-P - July 2003

Prevent Electrostatic Discharge

Remove Power

ATTENTION

Electrostatic discharge can damage integrated circuits or

semiconductors if you touch bus connector pins. Follow these

guidelines when you handle the module:

•Touch a grounded object to discharge static potential.

•Wear an approved wrist-strap grounding device.

•Do not touch the bus connector or connector pins.

•Do not touch circuit components inside the module.

•If available, use a static-safe work station.

•When not in use, keep the module in its static-shield box.

ATTENTION

Remove power before removing or installing this module. When you

remove or install a module with power applied, an electrical arc may

occur. An electrical arc can cause personal injury or property damage

by:

•sending an erroneous signal to your system’s field devices, causing

unintended machine motion

•causing an explosion in a hazardous environment

•causing permanent damage to the module’s circuitry

Electrical arcing causes excessive wear to contacts on both the module

and its mating connector. Worn contacts may create electrical

resistance.

MicroLogix™ 1200 Analog Output Module 5

Publication 1762-IN016A-EN-P - July 2003

Mounting

Minimum Spacing

Maintain spacing from enclosure

walls, wireways, adjacent

equipment, etc. Allow 50.8 mm

(2 in.) of space on all sides for

adequate ventilation, as shown:

DIN Rail Mounting

The module can be mounted using the following DIN rails: 35 x 7.5 mm

(EN 50 022 - 35 x 7.5) or 35 x 15 mm (EN 50 022 - 35 x 15).

Before mounting the module on a DIN rail, close the DIN rail latch. Press the DIN rail

mounting area of the module against the DIN rail. The latch will momentarily open and lock

into place.

ATTENTION

Do not remove protective debris strip until after the module and all

other equipment near the module is mounted and wiring is complete.

Once wiring is complete and the module is free of debris, carefully

remove protective debris strip. Failure to remove strip before operating

can cause overheating.

TIP 1762 expansion I/O may be mounted horizontally only.

ATTENTION

During panel or DIN rail mounting of all devices, be sure that all

debris (metal chips, wire strands, etc.) is kept from falling into the

module. Debris that falls into the module could cause damage when

power is applied to the module.

Side Side

Top

Bottom

MicroLogix

1200

1762 I/O

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Use DIN rail end anchors (Allen-Bradley part number 1492-EA35 or 1492-EAH35) for

environments with vibration or shock concerns.

Panel Mounting

Use the dimensional template shown below to mount the module. The preferred mounting

method is to use two M4 or #8 panhead screws per module. M3.5 or #6 panhead screws may

also be used, but a washer may be needed to ensure a good ground contact. Mounting screws

are required on every module.

TIP For environments with extreme vibration and shock concerns, use

the panel mounting method described below, instead of DIN rail

mounting.

End Anchor

(3.54)

100

(3.94)

40.4

(1.59)

40.4

(1.59)

14.5

(0.57)

For more than 2 modules: (number of modules - 1) x 40.4 mm (1.59 in.)

NOTE:

Hole spacing tolerance:

±0.4 mm (0.016 in.).

MicroLogix 1200

Expansion I/O

MicroLogix 1200

Expansion I/O

MicroLogix 1200

Expansion I/O

MicroLogix 1200

MicroLogix™ 1200 Analog Output Module 7

Publication 1762-IN016A-EN-P - July 2003

System Assembly

The expansion I/O module is attached to the controller or another I/O module by means of

a ribbon cable after mounting as shown below.

Field Wiring Connections

Grounding the Module

This product is intended to be mounted to a well-grounded mounting surface such as a metal

panel. Additional grounding connections from the module’s mounting tabs or DIN rail (if

used) are not required unless the mounting surface cannot be grounded. Refer to Industrial

Automation Wiring and Grounding Guidelines, Allen-Bradley publication 1770-4.1, for additional

information.

TIP Use the pull loop on the connector to disconnect modules. Do not

pull on the ribbon cable.

WARNING EXPLOSION HAZARD

•In Class I, Division 2 applications, the bus connector must be

fully seated and the bus connector cover must be snapped in

place.

•In Class I, Division 2 applications, all modules must be mounted

in direct contact with each other as shown on page 5. If DIN rail

mounting is used, an end stop must be installed ahead of the

controller and after the last 1762 I/O module.

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Publication 1762-IN016A-EN-P - July 2003

Output Type Selection

The output type selection, current or voltage, is made by wiring to the appropriate terminals,

Iout or Vout, and by the type/range selection bits in the Configuration Data File (see

page 14).

Wiring

System Wiring Guidelines

Consider the following when wiring your system:

•The analog common (COM) is not connected to earth ground inside the module. All

terminals are electrically isolated from the system.

•Channels are not isolated from each other.

•Use Belden™ 8761, or equivalent, shielded wire.

•Under normal conditions, the drain wire (shield) should be connected to the metal

mounting panel (earth ground). Keep shield connection to earth ground as short as

possible.

•To ensure optimum accuracy for voltage type outputs, limit overall cable impedance

by keeping all analog cables as short as possible. Locate the I/O system as close to

your voltage type sensors or actuators as possible.

ATTENTION

Analog outputs may fluctuate for less than a second when power is

applied or removed. This characteristic is common to most analog

outputs. While the majority of loads will not recognize this short

signal, it is recommended that preventive measures be taken to

ensure that connected equipment is not affected.

MicroLogix™ 1200 Analog Output Module 9

Publication 1762-IN016A-EN-P - July 2003

Terminal Block Layout

Differential Sensor Transmitter Types

Labeling the Terminals

A write-on label is provided with the module. Mark the identification of each terminal with

permanent ink, and slide the label back into the door.

TIP Grounding the cable shield at the module end only usually provides

sufficient noise immunity. However, for best cable shield

performance, earth ground the shield at both ends, using a 0.01 µF

capacitor at one end to block AC power ground currents, if

necessary.

V out 3

V out 2

V out 1

V out 0

I out 3

I out 2

I out 1

I out 0

COM

Commons connected

internally.

I out 0

I out 1

V out 2

V out 3

V out 0

V out 1

COM

I out 3

I out 2

COM

Current Load

Voltage Load

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Publication 1762-IN016A-EN-P - July 2003

Wiring the Finger-Safe Terminal Block

When wiring the terminal block, keep the finger-safe cover in place.

1. Route the wire under the terminal pressure plate. You can use the stripped end of the

wire or a spade lug. The terminals will accept a 6.35 mm (0.25 in.) spade lug.

2. Tighten the terminal screw making sure the pressure plate secures the wire.

Recommended torque when tightening terminal screws is 0.904 Nm (8 in-lbs).

3. After wiring is complete, remove the debris shield.

ATTENTION

Be careful when stripping wires. Wire fragments that fall into a

module could cause damage when power is applied. Once wiring is

complete, ensure the module is free of all metal fragments.

TIP If you need to remove the finger-safe cover, insert a screw driver

into one of the square wiring holes and gently pry the cover off. If

you wire the terminal block with the finger-safe cover removed, you

will not be able to put it back on the terminal block because the

wires will be in the way.

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