Rockwell Automation Micrologix 1200 Bedienungsanleitung

Publication 1762-IN013A-EN-P - April 2002

Installation Instructions

MicroLogix™

1200 Thermocouple/mV Input

Module

(Catalog Number 1762-IT4)

Inside…

Module Overview......................................................................................2

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

Module Installation...................................................................................3

System Assembly......................................................................................5

Mounting...................................................................................................6

Field Wiring Connections..........................................................................8

Cold-Junction Compensation (CJC)........................................................13

I/O Memory Mapping .............................................................................13

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

Hazardous Location Considerations .......................................................21

Environnements dangereux ....................................................................22

For More Information..............................................................................23

2MicroLogix™ 1200 Thermocouple/mV Input Module

Publication 1762-IN013A-EN-P - April 2002

Module Overview

The thermocouple/mV modules receives and stores digitally converted

thermocouple and/or millivolt (mV) analog data from any combination of up to

four thermocouple or millivolt analog sensors. Each input channel is individually

configurable via software for a specific input device and provides open-circuit,

over-range and under-range detection and indication. The module receives all of its

+5V dc and +24V dc power from the 1762 expansion I/O bus. The module features

a terminal block with a cold-junction compensation (CJC) sensor.

Accepted Inputs Range

Thermocouple Type J -210 to +1200°C (-346 to +2192°F)

Thermocouple Type K -270 to +1370°C (-454 to +2498°F)

Thermocouple Type T -270 to +400°C (-454 to +752°F)

Thermocouple Type E -270 to +1000°C (-454 to +1832°F)

Thermocouple Type R 0 to +1768°C (+32 to +3214°F)

Thermocouple Type S 0 to +1768°C (+32 to +3214°F)

Thermocouple Type B +300 to +1820°C (+572 to +3308°F)

Thermocouple Type N -210 to +1300°C (-346 to +2372°F)

Thermocouple Type C 0 to +2315°C (+32 to + 4199°F)

millivolt inputs -50 to +50 mV

-100 to +100 mV

MicroLogix™ 1200 Thermocouple/mV Input Module 3

Publication 1762-IN013A-EN-P - April 2002

Description

Module 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.

4MicroLogix™ 1200 Thermocouple/mV Input Module

Publication 1762-IN013A-EN-P - April 2002

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 Thermocouple/mV Input Module 5

Publication 1762-IN013A-EN-P - April 2002

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.

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 7. If DIN rail mounting is used, an end stop must be

installed ahead of the controller and after the last 1762

I/O module.

6MicroLogix™ 1200 Thermocouple/mV Input Module

Publication 1762-IN013A-EN-P - April 2002

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:

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

MicroLogix™ 1200 Thermocouple/mV Input Module 7

Publication 1762-IN013A-EN-P - April 2002

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.

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

8MicroLogix™ 1200 Thermocouple/mV Input Module

Publication 1762-IN013A-EN-P - April 2002

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.

System Wiring Guidelines

Consider the following when wiring your system:

•Do not tamper with or remove the CJC sensor on the terminal block.

Removal of the sensor will reduce accuracy and set the open circuit bit for

the CJC sensor.

•For thermocouple inputs, always use shielded, twisted-pair thermocouple

extension lead wires specified by the thermocouple manufacturer for the

themocouple type you are using. Using an incorrect thermocouple extension

wire type or not following correct polarity convention will cause invalid

readings.

•Keep cable shield connection to ground as short as possible.

•To limit noise, keep thermocouple and millivolt signal wires as far away as

possible from power and load lines as well as other sources of electrical

noise, such as motors, transformers, contactors, and AC devices.

•If the field wiring must cross AC or power cables, ensure that they cross at

right angles.

ATTENTION

The possibility exists that grounded or exposed

thermocouples can become shorted to a potential greater than

that of the thermocouple itself. Due to possible shock hazard,

care should be taken when wiring these types of

thermocouples.

MicroLogix™ 1200 Thermocouple/mV Input Module 9

Publication 1762-IN013A-EN-P - April 2002

•For millivolt inputs, always use Belden™ 8761 (shielded, twisted-pair) or

equivalent wire to ensure proper operation and high immunity to electrical

noise.

•If multiple power supplies are used with millivolt analog inputs, the power

supply commons must be connected.

•Ground the shield drain wire at one end only. The typical location is the

same point as the sensor ground reference.

–For grounded thermocouples or millivolt sensors, this is at the sensor

end.

–For insulated/ungrounded thermocouples, this is at the module end.

Contact your sensor manufacturer for additional details.

•If it is necessary to connect the shield drain at the module end, connect it to

earth ground using a panel or DIN rail mounting screw.

•Routing the field wiring in a grounded conduit can further reduce electrical

noise.

Terminal Block Layout

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.

IN1 -

IN1 +

IN 0 -

IN 0 +

IN2 -

IN2 +

CJC

IN3 -

IN3 +

10 MicroLogix™ 1200 Thermocouple/mV Input Module

Publication 1762-IN013A-EN-P - April 2002

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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