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 requirements of ISA/ANSI-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.
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Identifies information about practices or circumstances that can cause |
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WARNING |
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an explosion in a hazardous environment, which may lead to personal |
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injury or death, property damage, or economic loss. |
IMPORTANT
Identifies information that is critical for successful application and understanding of the product.
Identifies information about practices or circumstances that can lead
ATTENTION |
to personal injury or death, property damage, or economic loss. |
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Attentions help you: |
• identify a hazard
• avoid a hazard
• recognize the consequence
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 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.
Installation Instructions
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When you insert or remove the module while backplane power is on, |
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an electrical arc can occur. This could cause an explosion in |
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hazardous location installations. Be sure that power is removed or the |
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area is nonhazardous before proceeding. |
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If you connect or disconnect wiring while the field side power is on, |
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an electrical arc can occur. This could cause an explosion in |
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hazardous location installations. Be sure that power is removed or the |
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area is nonhazardous before proceeding.. |
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FLEX I/O is grounded through the DIN rail to chassis ground. Use |
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ATTENTION |
zinc plated yellow-chromate steel DIN rail to assure proper grounding. |
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The use of other DIN rail materials (e.g. aluminum, plastic, etc.) that |
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can corrode, oxidize, or are poor conductors, can result in improper or |
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intermittent grounding. |
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Preventing Electrostatic Discharge |
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ATTENTION |
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This equipment is sensitive to electrostatic discharge, which can cause |
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internal damage and affect normal operation. Follow these guidelines |
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when you handle this equipment: |
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• 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.
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The following information applies when operating this |
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Informations sur l’utilisation de cet équipement en |
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equipment in hazardous locations: |
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environnements dangereux : |
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Products marked “CL I, DIV 2, GP A, B, C, D” are suitable for use |
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Les produits marqués "CL I, DIV 2, GP A, B, C, D" ne |
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in Class I Division 2 Groups A, B, C, D, Hazardous Locations and |
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conviennent qu’à une utilisation en environnements de Classe I |
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nonhazardous locations only. Each product is supplied with |
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Division 2 Groupes A, B, C, D dangereux et non dangereux. |
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markings on the rating nameplate indicating the hazardous |
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Chaque produit est livré avec des marquages sur sa plaque |
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location temperature code. When combining products within a |
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d’identification qui indiquent le code de température pour les |
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system, the most adverse temperature code (lowest “T” |
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environnements dangereux. Lorsque plusieurs produits sont |
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number) may be used to help determine the overall temperature |
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combinés dans un système, le code de température le plus |
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code of the system. Combinations of equipment in your system |
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défavorable (code de température le plus faible) peut être |
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are subject to investigation by the local Authority Having |
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utilisé pour déterminer le code de température global du |
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Jurisdiction at the time of installation. |
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système. Les combinaisons d’équipements dans le système |
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sont sujettes à inspection par les autorités locales qualifiées |
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au moment de l’installation. |
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EXPLOSION HAZARD |
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RISQUE D’EXPLOSION |
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WARNING |
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• Do not disconnect equipment unless |
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AVERTISSEMENT |
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power has been removed or the area is |
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l’environnement est classé non |
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known to be nonhazardous. |
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dangereux avant de débrancher |
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• Do not disconnect connections to this |
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l'équipement. |
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• Couper le courant ou s'assurer que |
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equipment unless power has been |
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removed or the area is known to be |
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l’environnement est classé non |
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nonhazardous. Secure any external |
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dangereux avant de débrancher les |
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connections that mate to this |
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connecteurs. Fixer tous les connecteurs |
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equipment by using screws, sliding |
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externes reliés à cet équipement à |
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latches, threaded connectors, or other |
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l'aide de vis, loquets coulissants, |
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means provided with this product. |
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connecteurs filetés ou autres moyens |
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• Substitution of components may |
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fournis avec ce produit. |
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• La substitution de composants peut |
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impair suitability for Class I, |
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Division 2. |
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rendre cet équipement inadapté à une |
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• If this product contains batteries, they |
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utilisation en environnement de Classe |
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I, Division 2. |
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must only be changed in an area known |
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• S’assurer que l’environnement est |
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to be nonhazardous. |
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classé non dangereux avant de changer |
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les piles. |
FLEX I/O is a trademark of Rockwell Automation |
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DeviceNet is a trademark of ODVA, Inc. |
Publication 1794-IN102B-EN-P - June 2004 |
2
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 Category 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. |
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• This equipment is not resistant to sunlight or other sources of UV |
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radiation. |
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The secondary of a current transformer shall not be open-circuited |
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when applied in Class I, Zone 2 environments. |
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• Equipment of lesser Enclosure Type Rating must be installed in an |
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enclosure providing at least IP54 protection when applied in Class I, |
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Zone 2 environments. |
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• This equipment shall be used within its specified ratings defined by |
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Allen-Bradley. |
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Provision shall be made to prevent the rated voltage from being |
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exceeded by transient disturbances of more than 40% when |
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applied in Class I, Zone 2 environments |
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Installing Your ac Digital Input Module |
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7 |
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3 |
1 |
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2 |
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6 |
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The module mounts on a 1794 terminal base.
During mounting of all devices, be sure that all debris ATTENTION (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.
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If you remove or insert the module while the backplane |
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WARNING |
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power is on, an electrical arc can occur. This could cause an |
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explosion in hazardous location installations. Be sure that |
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power is removed or the area is nonhazardous before |
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proceeding.. |
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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 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.
Wiring Connections for the 1794-IA8 and -IA8K
Input |
1794-TB2,-TB3, -TB3S |
1794-TBN |
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Input |
120V ac |
Input |
120V ac |
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Terminal |
Supply |
Terminal |
Supply |
Input 0 |
A-0 |
A-11/C-35 |
B-0 |
C-12 |
Input 1 |
A-2 |
A-31/C-36 |
B-2 |
C-32 |
Input 2 |
A-4 |
A-51/C-37 |
B-4 |
C-52 |
Input 3 |
A-6 |
A-71/C-38 |
B-6 |
C-72 |
Input 4 |
A-8 |
A-91/C-39 |
B-8 |
C-92 |
Input 5 |
A-10 |
A-111/C-40 |
B-10 |
C-112 |
Input 6 |
A-12 |
A-131/C-41 |
B-12 |
C-132 |
Input 7 |
A-14 |
A-151/C-42 |
B-14 |
C-152 |
A = Input terminals (Even numbered terminals |
B = Even numbered Input terminals |
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0 thru 14) |
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0-14, ac common terminals 16 and 33 |
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B = Common terminals |
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C = Power terminals C-34 and C-51, and |
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C = Power terminals (C-34 and C-51 on -TB2; C-34 |
odd numbered input terminals 1 thru 15 |
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thru C-51 on -TB3 and -TB3S) |
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1A-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.
2C-1, 3, 5, 7, 9, 11, 13 and 15 on the 1794-TBN are internally connected in the module to 120V ac L1.
Publication 1794-IN102B-EN-P - June 2004
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