Allen-Bradley 1794-IA8 Service-Handbuch

Installation Instructions

Original Instructions

FLEX I/O AC Digital Input Modules

Catalog Numbers

1794-IA8, 1794-IA8I, 1794-IA16

Topic Page

Important User Information 2

Environment and Enclosure 3

North American Hazardous Location Approval 4

Prevent Electrostatic Discharge 5

Installing Your AC Digital Input Module 7

Configuring Your AC Input Module 14

Specifications 16

2Rockwell Automation Publication 1794-IN102D-EN-P - July 2018

FLEX I/O AC Digital Input Modules

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.rockwellautomation.com/literature/) 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 that are 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, when necessary, we use notes to make you aware of safety considerations.

WARNING: 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.

ATTENTION: 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 and recognize the consequences.

SHOCK HAZARD: Labels may be on or inside the equipment (for example, drive or motor)

to alert people that dangerous voltage may be present.

BURN HAZARD: Labels may be on or inside the equipment (for example, drive or motor) to

alert people that surfaces may reach dangerous temperatures.

IMPORTANT Identifies information that is critical for successful application and understanding of

the product.

Rockwell Automation Publication 1794-IN102D-EN-P - July 2018 3

FLEX I/O AC Digital Input Modules

Environment and Enclosure

ATTENTION:

This equipment is intended for use in a Pollution Degree 2 industrial

environment, in overvoltage Category II applications (as defined in EN/IEC 60664-1),

at altitudes up to 2000 m (6562 ft) without derating.

This equipment is not intended for use in residential environments and may not

provide adequate protection to radio communication services in such environments.

This equipment is supplied as open-type equipment for indoor use. 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 enclosure

must have suitable flame-retardant properties to prevent or minimize the spread

of flame, complying with a flame spread rating of 5V A or be approved for the

application if nonmetallic. The interior of the enclosure must be accessible only by

the use of a tool. Subsequent sections of this publication may contain more

information regarding specific enclosure type ratings that are required to comply

with certain product safety certifications.

In addition to this publication, see the following:

• Industrial Automation Wiring and Grounding Guidelines,

publication 1770-4.1, for additional installation requirements.

• NEMA Standard 250 and EN/IEC 60529, as applicable, for explanations of the

degrees of protection provided by enclosures.

ATTENTION: Read this document and the documents listed in the Additional

Resources section about installation, configuration, and operation of this

equipment before you install, configure, operate, or maintain this product. Users

are required to familiarize themselves with installation and wiring instructions in

addition to requirements of all applicable codes, laws, and standards.

Installation, adjustments, putting into service, use, assembly, disassembly, and

maintenance are required to be carried out by suitably trained personnel in

accordance with applicable code of practice. In case of malfunction or damage, no

attempts at repair should be made. The module should be returned to the

manufacturer for repair. Do not dismantle the module.

4Rockwell Automation Publication 1794-IN102D-EN-P - July 2018

FLEX I/O AC Digital Input Modules

North American Hazardous Location Approval

The following modules are North American Hazardous Location approved:

1794-IA8, 1794-IA8I, 1794-IA16.

The Following Information Applies When

Operating This Equipment In Hazardous Locations.

Informations sur l’utilisation de cet équipement en

environnements dangereux.

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

Locations and nonhazardous locations only. Each product

is supplied with markings on the rating nameplate

indicating the hazardous location temperature code.

When combining products within a system, the most

adverse temperature code (lowest "T" number) may be

used to help determine the overall temperature code of

the system. Combinations of equipment in your system

are subject to investigation by the local Authority Having

Jurisdiction at the time of installation.

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 Groupes A, B, C, D dangereux et non dangereux.

Chaque produit est livré avec des marquages sur sa plaque

d'identification qui indiquent le code de température pour les

environnements dangereux. Lorsque plusieurs produits sont

combinés dans un système, le code de température le plus

défavorable (code de température le plus faible) peut être

utilisé pour déterminer le code de température global du

système. Les combinaisons d'équipements dans le système

sont sujettes à inspection par les autorités locales qualifiées

au moment de l'installation.

WARNING:

Explosion Hazard –

• Do not disconnect equipment

unless power has been removed

or the area is known to

be nonhazardous.

• Do not disconnect connections to

this equipment unless power has

been removed or the area is

known to be nonhazardous.

Secure any external connections

that mate to this equipment by

using screws, sliding latches,

threaded connectors, or other

means provided with this product.

• Substitution of components may

impair suitability for Class I,

Division 2.

AVERTISSEMENT:

Risque d’Explosion –

• Couper le courant ou s'assurer que

l'environnement est classé non

dangereux avant de débrancher

l'équipement.

• Couper le courant ou s'assurer que

l'environnement est classé non

dangereux avant de débrancher les

connecteurs. Fixer tous les connecteurs

externes reliés à cet équipement à

l'aide de vis, loquets coulissants,

connecteurs filetés ou autres moyens

fournis avec ce produit.

• La substitution de composants peut

rendre cet équipement inadapté à une

utilisation en environnement de

Classe I, Division 2.

WARNING: When used in a Class I, Division 2, hazardous location, this equipment

must be mounted in a suitable enclosure with proper wiring method that

complies with the governing electrical codes.

Rockwell Automation Publication 1794-IN102D-EN-P - July 2018 5

FLEX I/O AC Digital Input Modules

Prevent Electrostatic Discharge

Special Conditions for Safe Use

ATTENTION: 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.

• Use a static-safe workstation, if available.

• Store the equipment in appropriate static-safe packaging when not in use.

ATTENTION:

• This product is grounded through the DIN rail to chassis ground. Use zinc

plated chromate-passivated steel DIN rail to assure proper grounding. The use

of other DIN rail materials (for example, aluminum or plastic) that can corrode,

oxidize, or are poor conductors, can result in improper or intermittent

grounding. Secure DIN rail to mounting surface approximately every 200 mm

(7.8 in.) and use end-anchors appropriately. Be sure to ground the DIN rail

properly. Refer to Industrial Automation Wiring and Grounding Guidelines,

publication 1770-4.1, for more information.

• Do not remove or replace an Adapter Module while power is applied.

Interruption of the backplane can result in unintentional operation or

machine motion.

• Do not remove or replace a terminal base unit while power is applied.

Interruption of the backplane cab result in unintentional operation or

machine motion.

• If this equipment is used in a manner not specified by the manufacturer, the

protection provided by the equipment may be impaired.

6Rockwell Automation Publication 1794-IN102D-EN-P - July 2018

FLEX I/O AC Digital Input Modules

Electrical Safety Considerations

WARNING:

• When you insert or remove the module while backplane power is on, an

electric 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.

Repeated electric arcing causes excessive wear to contacts on both the module

and its mating connector. Worn contacts may create electrical resistance that

can affect module operation.

• If you insert or remove the module while backplane power is on, an electric 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.

WARNING: 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.

ATTENTION:

• This equipment is certified for use only within the surrounding air temperature

range of -20…55 °C (-4…131 °F). The equipment must not be used outside

of this range.

• Use only a soft dry anti-static cloth to wipe down equipment. Do not use any

cleaning agents.

At the end of its life, this equipment should be collected separately from any

unsorted municipal waste.

Rockwell Automation Publication 1794-IN102D-EN-P - July 2018 7

FLEX I/O AC Digital Input Modules

Installing Your AC Digital Input Module

The module mounts on a 1794 terminal base.

1. Rotate the keyswitch (1) on the terminal base (2) clockwise to position 8

as required for this type of module.

2. Ensure that the Flexbus connector (3) is pushed all the way to the left to

connect with the neighboring terminal base/adapter. Yo u c a nn o t i ns t a l l

the module unless the connector is fully extended.

Description Description

1Keyswitch 5Alignmentbar

2Terminalbase 6Groove

3 Flexbus connector 7 Latching mechanism

4Module

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.

8Rockwell Automation Publication 1794-IN102D-EN-P - July 2018

FLEX I/O AC Digital Input Modules

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.

4. Position the module (4) with its alignment bar (5) aligned with the

groove (6) on the terminal base.

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

1. For 1794-TB2, 1794-TB3, or 1794-TB3S – Connect individual input

wiring to even-numbered terminals on the 0...15 row (A) as indicated in

the Wiring Connections for 1794-IA8 table.

For 1794-TBN – Connect individual input wiring to numbered

terminals on the 16...33 row (B) as indicated in the Wiring Connections

for 1794-IA8 table.

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 Wiring Connections for

1794-IA8 table. (The odd-numbered terminals on row A are internally

connected to 120VAC L1.)

For 1794-TB3 or 1794-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 Wiring Connections for

1794-IA8 table. (The odd-numbered terminals on row (A) and the

terminals of row (C) are internally connected to 120V AC power L1.)

WARNING: If 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.

Rockwell Automation Publication 1794-IN102D-EN-P - July 2018 9

FLEX I/O AC Digital Input Modules

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 Wiring Connections

for 1794-IA8 table. (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.

Wiring Connections for 1794-IA8

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

Input Input Terminal 120V AC Supply Input Terminal 120V AC Supply

Input 0 A-0 A-1(1)/C-35

(1) A-1, 3, 5, 7, 9, 11, 13, and 15 on the 1794-TB2, 1794-TB3, and 1794-TB3S are internally connected in the module to 120V AC L1.

B-0 C-1(2)

(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.

Input 1 A-2 A-3(1)/C-36 B-2 C-3(2)

Input 2 A-4 A-5(1)/C-37 B-4 C-5(2)

Input 3 A-6 A-7(1)/C-38 B-6 C-7(2)

Input 4 A-8 A-9(1)/C-39 B-8 C-9(2)

Input 5 A-10 A-11(1)/C-40 B-10 C-11(2)

Input 6 A-12 A-13(1)/C-41 B-12 C-13(2)

Input 7 A-14 A-15(1)/C-42 B-14 C-15(2)

A = Input terminals (Even-numbered terminals 0...14)

B = Common terminals

C = Power terminals (C-34 and C-51 on 1794-TB2; C-34 to C-

51 on 1794-TB3 and 1794-TB3S)

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...15

10 Rockwell Automation Publication 1794-IN102D-EN-P - July 2018

FLEX I/O AC Digital Input Modules

1794-TB2, 1794-TB3, and 1794-TB3S Terminal Base Wiring for

1794-IA8 and 1794-IA16

1794-TBN Terminal Base Wiring for 1794-IA8 and 1794-IA16

Connecting Wiring for the 1794-IA16

1. For 1794-TB3 or 1794-TB3S – Connect individual input wiring to

numbered terminals on the 0...15 row (A) as indicated in the Te r m i n a l

Base Wiring for 1794-IA16 table.

For 1794-TBN – Connect individual input wiring to even-numbered

terminals on the 16...33 row (B), and to the odd-numbered terminals on

17 18 19 20 21 22 23 24 25 26 27 28 29 30 31 32 33

0 1 2 3 4 5 6 7 8 9 10 11 12 13 14 15

35 36 37 38 39 40 41 42 43 44 45 46 47 48 49 50 51

Inputs

Commons

(1794-TB3 shown)

L1 Voltage

Connect 120V AC L1 power to terminal C-34

Connect 120V AC common L2 to terminal B-16

Use B-33 and C-51 for daisychaining to the next terminal base unit

(Terminals C-35 thru C-50 not available on the 1794-TB2.)

16 0

15 51

Even Numbered I/O Terminals 0 thru 14

Odd Numbered I/O Terminals 1 thru 15 (1794-TBN shown)

L1 = 120V AC - Connect to terminal C-34

L2 = 120V AC common - Connect to terminal B-16

Use B-33 and C-51 for daisychaining to the next terminal base unit

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