Rockwell Automation 1794-IA8, 1794-IA8I, 1794-IA16 User Manual

Installation Instructions

FLEX I/O ac Digital Input Modules

Cat. Nos. 1794-IA8, -IA8K, IA8I, -IA16

(Modules with a K in the last position of the catalog number are conformally coated to meet noxious gas requireme nts of ISA / AN SI-71.040 1985 Class G3 Environment.)

Important User Information

Solid state equipment has operational characteristics differing from those of electromechanical equipment. Safety Guidelines for the Application, Installation and Maintenance of Solid State Controls (Publication SGI-1.1 available from your local Rockwell Automation sales office or online at http://www.ab.com/manuals/gi) describes some important differences between solid state equipment and hard-wired electromechanical devices. Because of this difference, and also because of the wide variety of uses for solid state equipment, all persons responsible for applying this equipment must satisfy themselves that each intended application of this equipment is acceptable.

In no event will Rockwell Automation, Inc. be responsible or liable for indirect or consequential damages resulting from the use or application of this equipment.

The examples and diagrams in this manual are included solely for illustrative purposes. Because of the many variables and requirements associated with any particular installation, Rockwell Automation, Inc. cannot assume responsibility or liability for actual use based on the examples and diagrams.

No patent liability is assumed by Rockwell Automation, Inc. with respect to use of information, circuits, equipment, or software described in this manual.

Reproduction of the contents of this manual, in whole or in part, without written permission of Rockwell Automation, Inc. is prohibited.

Throughout this manual we use notes to make you aware of safety considerations.

WARNING

IMPORTANT

ATTENTION

Identifies information about practices or circumstances that can cause an explosion in a hazardous environment, which may lead to personal injury or death, property damage, or economic loss.

Identifies information that is critical for successful application and understanding of the product.

Identifies information about practices or circumstances that can lead to personal injury or death, property damage, or economic loss. Attentions help you:

• identify a hazard

• avoid a hazard

• recognize the consequence

Environment and Enclosure

This equipment is intended for use in a Pollution Degree 2 industrial environment, in overvoltage Category II applications (as defined in IEC publication 60664-1), at altitudes up to 2000 meters without derating.

This equipment is considered Group 1, Class A industrial equipment according to IEC/CISPR Publication 11. Without appropriate precautions, there may be potential difficulties ensuring electromagnetic compatibility in other environments due to conducted as well as radiated disturbance.

This equipment is supplied as "open type" equipment. It must be mounted within an enclosure that is suitably designed for those specific environmental conditions that will be present and appropriately designed to prevent personal injury resulting from accessibility to live parts. The interior of the enclosure must be accessible only by the use of a tool. Subsequent sections of this publication may contain additional information regarding specific enclosure type ratings that are required to comply with certain product safety certifications.

See NEMA Standards publication 250 and IEC publication 60529, as applicable, for explanations of the degrees of protection provided by different types of enclosure. Also, see the appropriate sections in this publication, as well as the Allen-Bradley publication 1770-4.1 ("Industrial Automation Wiring and Grounding Guidelines"), for additional installation requirements pertaining to this equipment.

WARNING

ATTENTION

When you insert or remove the module while backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding.

If you connect or disconnect wiring while the field side power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding..

FLEX I/O is grounded through the DIN rail to chassis ground. Use zinc plated yellow-chromate steel DIN rail to assure proper grounding. The use of other DIN rail materials (e.g. aluminum, plastic, etc.) that can corrode, oxidize, or are poor conductors, can result in improper or intermittent grounding.

Preventing Electrostatic Discharge

This equipment is sensitive to electrostatic discharge, which can cause internal damage and affect normal operation. Follow these guidelines when you handle this equipment:

• Touch a grounded object to discharge potential static.

• Wear an approved grounding wriststrap.

• Do not touch connectors or pins on component boards.

• Do not touch circuit components inside the equipment.

• If available, use a static-safe workstation.

North American Hazardous Location Approval

The following input modules are North American Hazardous Location approved: 1794-IA8, -IA8K, -IA8I and 1794-IA16.

The following information applies when operating this equipment in hazardous locations:

Products marked “CL I, DIV 2, GP A, B, C, D” are suitable for use in Class I Division 2 Groups A, B, C, D, Hazardous Lo cations and nonhazardous loc ations only. Each product is supplied with markings on the rating nameplate indicating the hazardous location temperature code. When combining products within a system, the mos t adverse temperatur e code (lowest “T” number) may be used to help determine the overall temperature code of the sys tem. Combinations of e quipment in your system are subject to i nvestigation by the loca l Authority Having Jurisdiction at the t ime of installation.

WARNING

EXPLOSION HAZARD

• Do not discon nect equipment unless power has been removed or the area is known to be n onhazardous.

• Do not disconnect connections to this equipment un less power has been removed or the area is known to be nonhazardous. Secure any external connections that mate to this equipment by using scr ews, sliding latches, thre aded connectors, or other means provided with this product.

• Substituti on of components ma y impair suitability f or Class I, Division 2.

• If this product contains batteries, they must only be changed in an area known to be nonhazar dous.

Informations sur l’utilisation de cet équipement en environnements dangereux :

Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne conviennent qu’à une utilisation en environnements de Classe I Division 2 Grou pes A, B, C, D dangere ux et non dangereux. Chaque produit est livré avec des mar quages sur sa plaque d’identificati on qui indiquent le code de température pour les environnemen ts dangereux. Lorsq ue plusieurs produits s ont combinés dans un syst ème, le code de température le plus défavorable (c ode de température le p lus faible) peut être utilisé pour dé terminer le code de tem pérature global du système. Les c ombinaisons d’équipeme nts dans le système sont sujettes à inspe ction par les autorités local es qualifiées au moment de l’ installation.

AVERTISSEMENT

RISQUE D’EXPLOSION

• Couper le cou rant ou s’assurer que l’environnement est classé non dangereux avant de débrancher l'équipement .

• Couper le cou rant ou s'assurer que l’environnement est classé non dangereux avant de débrancher les connecteurs. Fixer tou s les connecteurs externes reli és à cet équipement à l'aide de vis , loquets coulissants, connecteurs filetés ou autres moyens fournis avec c e produit.

• La substitut ion de composants peut rendre cet é quipement inadapté à une utilisation en en vironnement de Classe I, Division 2.

• S’assurer que l’environnement est classé non da ngereux avant de change r les piles.

FLEX I/O is a trademark of Rockwell Automation DeviceNet is a trademark of ODVA, Inc. Publication 1794-IN102B-EN-P - June 2004

European Hazardous Location Approval

The following module is European Zone 2 approved: 1794-IA8K.

European Zone 2 Certification (The following applies when the product bears the EEx Marking)

This equipment is intended for use in potentially explosive atmospheres as defined by European Union Directive 94/9/EC.

The LCIE (Laboratoire Central des Industries Electriques) certifies that this equipment has been found to comply with the Essential Health and Safety Requirements relating to the design and construction of Categor y 3 equipment intended for use in potentially explosive atmospheres, given in Annex II to this Directive. The examination and test results are recorded in confidential report No. 28 682 010.

Compliance with the Essential Health and Safety Requirements has been assured by compliance with EN 50021.

IMPORTANT

Observe the following additional Zone 2 certification requirements.

• This equipment is not resistant to sunlight or other sources of UV radiation.

• The secondary of a current transformer shall not be open-circuited when applied in Class I, Zone 2 environments.

• Equipment of lesser Enclosure Type Rating must be installed in an enclosure providing at least IP54 protection when applied in Class I, Zone 2 environments.

• This equipment shall be used within its specified ratings defined by Allen-Bradley.

• Provision shall be made to prevent the rated voltage from being exceeded by transient disturbances of more than 40% when applied in Class I, Zone 2 environments

Installing Your ac Digital Input Module

5. Press firmly and evenly to seat the module in the terminal base unit. The module is seated when the latching mechanism (7) is locked into the module.

Connecting Wiring for the 1794-IA8 and -IA8K

1. For 1794-TB2, -TB3, or -TB3S - Connect individual input wiring to even numbered terminals on the 0-15 row (A) as indicated in the table below . For 1794-TBN - Connect individual input wiring to numbered terminals on the 16-33 row (B) as indicated in the table below.

2. For 1794-TB2 - Connect the associated 120V ac power lead (L1) of the input device to the corresponding odd numbered terminals on the 0-15 row A for each input as indicated in the table below. (The odd numbered terminals on row A are internally connected to 120V ac L1.)

For 1794-TB3, or -TB3S - Connect the associated 120V ac power lead (L1) of the input device to the corresponding odd numbered terminals on the 34-51 row (C) or to the corresponding terminal on row (C) for each input as indicated in the table below. (The odd numbered terminals on row (A) and the terminals of row (C) are internally connected to 120V ac power L1.)

For 1794-TBN - Connect the associated 120V ac power lead (L1) of the input device to the corresponding odd numbered terminal on the 34-51 row (C) for each input as indicated in the table below. (The 120V ac power terminals of row (C) are internally connected together.)

3. Connect 120V ac power (L1) to terminal 34 on the 34-51 row (C).

4. Connect 120V ac common (L2) to terminal 16 on the 16-33 row (B).

5. If daisychaining power to the next terminal base, connect a jumper

from terminal 51 (+120V ac L1) on this base unit to terminal 34 on the next base unit

6. .If continuing ac common to the next base unit, connect a jumper from terminal 33 (120V common L2) on this base unit to terminal 16 on the next base unit.

The module mounts on a 1794 terminal base.

ATTENTION

During 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 on power up.

1. Rotate the keyswitch (1) on the terminal base (2) clockwise to position 8 as required for this type of module.

2. Make certain the flexbus connector (3) is pushed all the way to the left to connect with the neighboring terminal base/adapter. You cannot install the module unless the connector is fully extended.

3. Make sure the pins on the bottom of the module are straight so they

will align properly with the connector in the terminal base.

WARNING

If you remove or insert the module while the backplane power is on, an electrical arc can occur. This could cause an explosion in hazardous location installations. Be sure that power is removed or the area is nonhazardous before proceeding..

4. Position the module (4) with its alignment bar (5) aligned with the groove (6) on the terminal base.

Publication 1794-IN102B-EN-P - June 2004

Wiring Connections for the 1794-IA8 and -IA8K

Input

Input 0 A-0

Input 1 A-2

Input 2 A-4

Input 3 A-6

Input 4 A-8

Input 5 A-10

Input 6 A-12

Input 7 A-14

A = Input terminals (Even numbe red terminals

0 thru 14) B = Common terminals C = Power terminals (C-34 and C-51 on - TB2; C-34

thru C-51 on -TB3 and -TB3S)

1 A-1, 3, 5, 7, 9, 11, 13 and 15 on the 1794-TB2, -TB3 and - TB3S are internally connected in the

module to 120V ac L1.

2 C-1, 3, 5, 7, 9, 11, 13 and 15 on the 1794-TBN are internally connected in the module to

120V ac L1.

1794-TB2,-TB3, -TB3S 1794-TBN Input

Ter mi nal

120V ac Supply

A-11/C-35

A-31/C-36

A-51/C-37

A-71/C-38

A-91/C-39

A-111/C-40

A-131/C-41

A-151/C-42

Input Te rm in al

B-0

B-2

B-4

B-6

B-8

B-10

B-12

B-14

B = Even numbered Input terminals 0-14, ac common terminals 16 and 33 C = Power terminals C-34 and C-51, and odd numbered input terminals 1 thru 1 5

120V ac Supply

C-1

C-3

C-5

C-7

C-9

C-11

C-13

C-15

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