Allen Bradley Flex 16Pt Digital Output Module

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Brand Name                 AB

Product reference     1794-OB16

The following modules are European Zone 2 approved: 1794-OB8, 1794-OB8EP, 1794-OB16, 1794-OB16P. European Zone 2 Certification 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. • 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.

The following modules are North American Hazardous Location approved: 1794-OB8, 1794-OB8EP, 1794-OB16, 1794-OB16P. 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 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.

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

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-OB8, 1794-OB8EP, 1794-OB16, and 1794-OB16P 1. Connect individual output wiring to numbered terminals on the 0-15 row (A) as indicated in the table below (1794-OB8 – Terminals 0...7; 1794-OB16 and 1794-OB16P – terminals 0...15; 1794-OB8EP – even numbered terminals 0...14). 2. Connect the associated -V output common to the corresponding terminal on the 16-33 row (B) for each output as indicated in the table below. (Commons are internally connected together.) 1794-OB8EP – connect associated output common to odd-numbered terminals on row A or associated terminals on row (B). 3. Connect +V DC power to terminal 34 on the 34-51 row (C). 4. Connect -V DC common to terminal 16 on the 16-33 row (B). 5. If daisychaining power to the next terminal base, connect a jumper from terminal 51 (+V DC) on this base unit to terminal 34 on the next base unit. 6. If continuing -V DC common to the next base unit, connect a jumper from terminal 33 (common) on this base unit to terminal 16 on the next base unit. 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. 

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-OB8, 1794-OB8EP, 1794-OB16, and 1794-OB16P 

1. Connect individual output wiring to numbered terminals on the 0-15 row (A) as indicated in the table below (1794-OB8 – Terminals 0...7; 1794-OB16 and 1794-OB16P – terminals 0...15; 1794-OB8EP – even numbered terminals 0...14). 

2. Connect the associated -V output common to the corresponding terminal on the 16-33 row (B) for each output as indicated in the table below. (Commons are internally connected together.) 1794-OB8EP – connect associated output common to odd-numbered terminals on row A or associated terminals on row (B).

3. Connect +V DC power to terminal 34 on the 34-51 row (C). 

4. Connect -V DC common to terminal 16 on the 16-33 row (B). 5. If daisychaining power to the next terminal base, connect a jumper from terminal 51 (+V DC) on this base unit to terminal 34 on the next base unit. 6. If continuing -V DC common to the next base unit, connect a jumper from terminal 33 (common) on this base unit to terminal 16 on the next base unit.

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