Rockwell Automation 1794-OB16P

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Installation Instructions

FLEX I/O Digital DC Output Modules

Catalog numbers 1794-OB8, 1794-OB8EP, 1794-OB16,

1794-OB16P, 1794-OB32P

Table of Contents

Topic Page

Important User Information 2

Environment and Enclosure 3

Preventing Electrostatic Discharge 3

European Hazardous Location Approval 3

North American Hazardous Location Approval 7

Install Your FLEX I/O AC Digital Output Module 8

Connect Wiring for 1794-OB8, 1794-OB8EP, 1794-OB16, and 1794-OB16P 9

Connect Wiring for the 1794-OB32P 11

Configuring your 1794-OB8EP Output Module 14

Configure the 1794-OB8, 1794-OB16, 1794-OB16P, 1794-OB32P Modules 15

Specifications 16

Main Page

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Summary

Important User Information

Safety Information and Warnings

Defines safety icons (WARNING, ATTENTION, IMPORTANT) used to highlight hazards and critical information.

Preventing Electrostatic Discharge

Electrostatic Discharge (ESD) Precautions

Provides guidelines to prevent damage from electrostatic discharge during handling.

Grounding and DIN Rail Installation

Hazardous Location Installation Warnings

Warns about potential explosions in hazardous locations when inserting/removing modules and advises on proper procedures.

European Hazardous Location Approval

ATEX;IECEx Zone 2 Certification Details

Details ATEX/IECEx Zone 2 certification, application, and mandatory requirements for hazardous locations.

North American Hazardous Location Approval

Class I, Division 2 Hazardous Location Requirements

Covers suitability for Class I, Division 2 hazardous locations and critical explosion hazard warnings.

Install Your FLEX I;O AC Digital Output Module

Connect Wiring for 1794-OB8, OB8 EP, OB16, and OB16 P

Wiring Connections for OB8, OB16, OB16 P Modules

Details terminal connections for 1794-OB8, OB16, and OB16P modules with specified terminal bases.

Wiring Connections for 1794-OB8 EP

1794-OB8 EP Wiring with TB2, TB3, TB3 S, TBN

Wiring details for 1794-OB8EP module with TB2, TB3, TB3S, and TBN terminal bases.

Connect Wiring for the 1794-OB32 P

1794-OB32 P Wiring Procedure

Details wiring procedures and terminal connections for the 1794-OB32P module.

Wiring Connections for 1794-OB32 P

1794-OB32 P TB32;TB32 S Wiring

1794-TB32 and 1794-TB32 S Terminal Base Wiring for 1794-0 B32 PI

Configuring your 1794-OB8 EP Output Module

Configuration and Programming

Covers memory map, setting configuration bits, and programming the 1794-OB8EP module.

Configure the 1794-OB8, 1794-OB16, 1794-OB16 P, 1794-OB32 P Modules

Module Configuration Memory Map

Specifications - 1794-OB16 and 1794-OB16 P

1794-OB16 and OB16 P Specifications

This document describes the FLEX I/O Digital DC Output Modules, specifically catalog numbers 1794-OB8, 1794-OB8EP, 1794-OB16, 1794-OB16P, and 1794-OB32P. These modules are designed for use in industrial automation systems, providing digital DC output capabilities.

Function Description:

The FLEX I/O Digital DC Output Modules are solid-state devices that provide digital DC output signals for controlling various industrial equipment. They are designed to be mounted on a 1794 terminal base, which facilitates wiring and integration into a FLEX I/O system. The modules support different numbers of outputs: 8 outputs for 1794-OB8 and 1794-OB8EP, 16 outputs for 1794-OB16 and 1794-OB16P, and 32 outputs for 1794-OB32P. All modules are current-sourcing types.

The modules are configured by setting bits in a configuration word, which allows users to define the behavior of the outputs. For the 1794-OB8EP module, specific bits in the image table memory map are used for output control and fault status. It includes an overload fault bit to indicate a fault condition and a fault reset bit to clear faults. The 1794-OB8, 1794-OB16, 1794-OB16P, and 1794-OB32P modules also use an image table memory map for output control, with different bit assignments corresponding to their respective output counts.

Important Technical Specifications:

General Specifications:

External DC Power Supply Voltage, Nom: 24V DC
External DC Power Voltage Range:
- 1794-OB8, 1794-OB16, 1794-OB16P, 1794-OB32P: 10...31.2V DC (includes 5% AC ripple)
- 1794-OB8EP: 19.2...31.2V DC (includes 5% AC ripple)
Off-state Voltage, Max: 31.2V DC
Dimensions (H x W x D): 94 x 94 x 69 mm (3.7 x 3.7 x 2.7 in.)
Keyswitch Position: 2
Enclosure Type Rating: None (open-style)
Wiring Category: 2 - on signal ports

1794-OB8 Specifics:

Number of Outputs: 8, current, sourcing
Recommended Terminal Base Unit: 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK
On-state Voltage, Output Min: 10V DC
On-state Voltage, Output Nom: 24V DC
On-state Voltage, Output Max: 31.2V DC
Output Current Rating: 4 A (8 outputs @ 0.5 A)
On-state Current, Output, Min: 1.0 mA per channel
On-state Current, Output, Max: 500 mA per channel
On-state Voltage Drop, Max: 0.5V DC
Surge Current: 2 A for 50 ms, repeatable every 2 seconds
Off-state Leakage Current, Max: 0.5 mA
Isolation Voltage: 50V (continuous), Basic Insulation Type. Tested at 850V DC for 1 s, between user and system. No isolation between individual channels.
Output Signal Delay (Off to On/On to Off): 0.5 ms / 1.0 ms
FlexBus Current: 60 mA @ 5V DC
Power Dissipation, Max: 3.3 W @ 31.2V DC
Thermal Dissipation, Max: 11.2 BTU/hr @ 31.2V DC
Fusing: Module outputs are not fused. External fusing (e.g., SAN-0 MQ4-800mA fuses) is recommended.
External DC Power Supply Current: 25 mA @ 24V DC (10...35 mA)
Weight, Approx.: 73 g (2.57 oz.)

1794-OB8EP Specifics:

Number of Outputs: 8, current, sourcing
Recommended Terminal Base Unit: 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TBN, 1794-TB3K, 1794-TB3SK, 1794-TBNK
On-state Voltage, Output Min: 19.2V DC
On-state Voltage, Output Nom: 24V DC
On-state Voltage, Output Max: 31.2V DC
Output Current Rating: 2.0 A max per output; 10.0 A max per module (8 outputs @ 1.25 A, 5 outputs @ 2.0 A, or similar combinations totaling 10.0 A or less)
On-state Current, Output, Min: 1.0 mA per channel
On-state Current, Output, Max: 2.0 A per channel
On-state Voltage Drop, Max: 0.2V DC
Surge Current: 4 A for 50 ms, repeatable every 3 seconds
Off-state Leakage Current, Max: 0.5 mA
Isolation Voltage: 50V (continuous), Basic Insulation Type. Tested at 850V DC for 1 s, between field side and system. No isolation between individual channels.
Output Signal Delay (Off to On/On to Off): 0.1 ms / 0.1 ms
FlexBus Current: 73 mA @ 5V DC
Power Dissipation, Max: 5.5 W @ 31.2V DC
Thermal Dissipation, Max: 18.8 BTU/hr @ 31.2V DC
Fusing: Outputs are electronically fused.
External DC Power Supply Current: 80 mA @ 24V DC
Weight, Approx.: 104 g (3.66 oz.)

1794-OB16 Specifics:

Number of Outputs: 16, current, sourcing
Recommended Terminal Base Unit: 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK
On-state Voltage, Output Min: 10V DC
On-state Voltage, Output Nom: 24V DC
On-state Voltage, Output Max: 31.2V DC (see Derating Curve for 1794-OB16P)
Output Current Rating: 8.0 A (16 outputs @ 0.5 A)
On-state Current, Output, Min: 1.0 mA per channel
On-state Current, Output, Max: 500 mA per channel
On-state Voltage Drop, Max: 0.5V DC
Surge Current: 2 A for 50 ms, repeatable every 2 seconds
Off-state Leakage Current, Max: 0.5 mA
Isolation Voltage: 50V (continuous), Basic Insulation Type. Tested at 850V DC for 1 s between user and system. No isolation between individual channels.
Output Signal Delay (Off to On/On to Off): 0.5 ms / 1.0 ms
FlexBus Current: 80 mA @ 5V DC
Power Dissipation, Max: 5.3 W @ 31.2V DC
Thermal Dissipation, Max: 18.1 BTU/hr @ 31.2V DC
Fusing: Module outputs are not fused. External fusing (e.g., SAN-0 MQ4-800 mA fuses) is recommended.
External DC Power Supply Current: 49 mA @ 24V DC (20...65 mA)
Weight, Approx.: 78 g (2.75 oz.)

1794-OB16P Specifics:

Number of Outputs: 16, current, sourcing
Recommended Terminal Base Unit: 1794-TB2, 1794-TB3, 1794-TB3S, 1794-TB3K, 1794-TB3SK
On-state Voltage, Output Min: 10V DC
On-state Voltage, Output Nom: 24V DC
On-state Voltage, Output Max: 31.2V DC (see Derating Curve for 1794-OB16P)
Output Current Rating: 8.0 A (16 outputs @ 0.5 A)
On-state Current, Output, Min: 1.0 mA per channel
On-state Current, Output, Max: 500 mA per channel
On-state Voltage Drop, Max: 0.5V DC
Surge Current: 1.5 A for 50 ms, repeatable every 2 seconds
Off-state Leakage Current, Max: 0.5 mA
Isolation Voltage: 50V (continuous), Basic Insulation Type. Type tested at 2121V DC for 60 s, between field side and system. No isolation between individual channels.
Output Signal Delay (Off to On/On to Off): 0.5 ms / 1.0 ms
FlexBus Current: 60 mA @ 5V DC
Power Dissipation, Max: 5.0 W @ 31.2V DC
Thermal Dissipation, Max: 17.0 BTU/hr @ 31.2V DC
Fusing: Outputs are electronically protected.
External DC Power Supply Current: 60 mA @ 24V DC (25...75 mA)
Weight, Approx.: 74 g (2.61 oz.)

1794-OB32P Specifics:

Number of Outputs: 32, current, sourcing
Recommended Terminal Base Unit: 1794-TB32, 1794-TB32S
On-state Voltage, Output Min: 10V DC
On-state Voltage, Output Nom: 24V DC
On-state Voltage, Output Max: 31.2V DC
Output Current Rating: 14.0 A max per module (6 A total for channels 0...15; 8 A total for channels 16...31)
On-state Current, Output, Min: 1.0 mA per channel
On-state Current, Output, Max: 500 mA per channel
On-state Voltage Drop, Max: 0.5V DC
Surge Current: 2 A for 50 ms, repeatable every 2 seconds
Off-state Leakage Current, Max: 0.5 mA
Isolation Voltage: 50V (continuous), Basic Insulation Type. Type tested at 850V DC for 60 s, between field side and system. No isolation between individual channels.
Output Signal Delay (Off to On/On to Off): 0.5 ms / 1.0 ms
FlexBus Current: 80 mA @ 5V DC
Power Dissipation, Max: 5.3 W @ 31.2V DC
Thermal Dissipation, Max: 18.1 BTU/hr @ 31.2V DC
Fusing: Outputs are electronically protected.
External DC Power Supply Current: 219 mA @ 24V DC (104 mA @ 10V DC; 278 mA @ 31.2V DC)
Weight, Approx.: 85 g (2.99 oz.)

Environmental Specifications:

Operating Temperature:
- -20...55 °C (-4...131 °F) for 1794-OB8, 1794-OB8EP, 1794-OB16, 1794-OB16P
- 0...55 °C (32...131 °F) for 1794-OB32P
Temperature, Surrounding Air, Max: 55 °C (131 °F)
Nonoperating Temperature: -40...85 °C (-40...185 °F)
Relative Humidity: 5...95% non-condensing, non-condensing
Vibration (Operating): 5 g @ 10...500 Hz
Shock (Operating/Nonoperating): 30 g / 50 g
Emissions: CISPR 11, Group 1, Class A (with appropriate enclosure)
ESD Immunity: IEC 61000-4-2: 6 kV contact discharges, 8 kV air discharges
Radiated RF Immunity:
- 1794-OB8, 1794-OB8EP, 1794-OB16, 1794-OB16P: 10V/m with 1 kHz sine-wave 80% AM from 80...2700 MHz, 10V/m with 200 Hz 50% Pulse 100% AM @ 900 MHz and 1890 MHz.
- 1794-OB32P: 10V/m with 1 kHz sine-wave 80% AM from 30...1000 MHz.
EFT/B Immunity: IEC 61000-4-4: ±2 kV or ±3 kV on power ports, ±2 kV or ±3 kV on signal ports depending on module type.
Surge Transient Immunity: IEC 61000-4-5: ±1 kV line-line(DM) and ±2 kV line-earth(CM) on signal ports
Conducted RF Immunity: IEC 61000-4-6: 10V rms with 1 kHz sine-wave 80% AM from 150 kHz...80 MHz

Usage Features:

Mounting: The modules are designed for easy installation on a 1794 terminal base. The keyswitch on the terminal base must be set to position 2 for these modules. The Flexbus connector must be fully extended to connect with neighboring terminal bases or adapters.
Wiring: Detailed wiring instructions are provided for connecting individual output wiring, associated output common, and +V DC power. Daisy-chaining power and common to subsequent terminal bases is supported.
Configuration: Modules are configured through a configuration word, allowing for flexible control over output behavior. The 1794-OB8EP module includes fault detection and reset capabilities.
Hazardous Location Approval: The modules are approved for use in European and North American hazardous locations, with specific requirements for enclosure and installation. For European hazardous locations (CE II 3G), they are intended for Zone 2 environments and must be mounted in an ATEX/IECEx Zone 2 certified enclosure with at least IP54 ingress protection. For North American hazardous locations (CL I, DIV 2, GP A, B, C, D), they are suitable for Class I Division 2 Groups A, B, C, D.

Maintenance Features:

Electrostatic Discharge (ESD) Prevention: Users are advised to follow ESD prevention guidelines, such as touching grounded objects, wearing grounding wriststraps, and avoiding contact with connectors or circuit components, to prevent internal damage.
Troubleshooting: The 1794-OB8EP module includes fault indicators (red fault indicators) and status indicators (yellow status indicators) to aid in troubleshooting. Faults can be reset via a button on the module, by toggling a specific bit in the write word, or by cycling backplane power.
Repair: In case of malfunction or damage, no attempts at repair should be made by the user. The module should be returned to the manufacturer for repair.
Cleaning: Only a soft, dry, anti-static cloth should be used to wipe down the equipment. No cleaning agents should be used.
End of Life: At the end of its life, the equipment should be collected separately from unsorted municipal waste.
Grounding: Proper grounding through a zinc-plated chromate-passivated steel DIN rail is crucial for proper operation and safety. The DIN rail should be secured approximately every 200 mm (7.8 in.) with end-anchors.
Fusing: For modules without electronic protection (e.g., 1794-OB8, 1794-OB16), external fusing is recommended to protect the outputs.

Rockwell Automation 1794-OB16P Specifications

General

Manufacturer	Rockwell Automation
Product Type	Digital Output Module
Output Type	Sourcing
Number of Outputs	16
Output Voltage Category	24V DC
Total Current Rating	8A
Isolation Voltage	50V
Operating Temperature	-20 to 60°C
Series	1794 Flex I/O
Current per Output	0.5 A @ 60 °C (140 °F)