Technical specifications, features, applications and purchasing information.
| Brand | Allen-Bradley |
| Model Number | 1734-OB8 |
| Product Category | Digital Output Module |
| Product Family | POINT I/O |
| Product Bulletin | Bulletin 1734 |
| Module Type | Digital DC Sourcing Output Module |
| Number of Output Channels | 8 |
| Output Channel Configuration | 1 Group of 8 Non-Isolated Sourcing Outputs |
| Output Signal Type | Discrete DC, PNP Sourcing |
| Nominal Output Voltage | 24 VDC |
| On-State Output Voltage Range | 10-28.8 VDC |
| Maximum On-State Voltage Drop | 0.2 VDC |
| Minimum On-State Current Per Channel | 1 mA |
| Maximum Output Current Per Channel | 1 A |
| Maximum Combined Output Current Per Module | 3 A |
| Surge Output Current | 2 A for 10 ms, Repeatable Every 3 Seconds |
| Maximum Off-State Leakage Current | 0.5 mA at 28.8 VDC |
| Maximum Off-to-On Signal Delay | 0.1 ms |
| Maximum On-to-Off Signal Delay | 0.1 ms |
| Individual Output Channel Isolation | No |
| Integrated Electronic Output Protection | No; Standard Non-Protected Output Configuration |
| Integrated Per-Channel Fault Diagnostics | Not Provided as on the 1734-OB8E Variant |
| Output Terminal Assignments | Terminals 0-7 Correspond to Outputs 0-7 |
| Field Power Distribution | Via POINT I/O Field Power Bus and Compatible Power Distribution Hardware |
| External DC Power Supply Voltage | 24 VDC Nominal |
| External DC Power Supply Voltage Range | 10-28.8 VDC |
| External DC Power Supply Current for Module Electronics | 32 mA |
| POINTBus Supply Voltage | 5 VDC |
| Maximum POINTBus Current Draw | 75 mA at 5 VDC |
| Maximum Power Dissipation | 2 W at 28.8 VDC |
| Maximum Thermal Dissipation | 6.8 BTU/hr at 28.8 VDC |
| Isolation Voltage | 50 V Continuous, Reinforced Insulation, Field Side to System |
| Isolation Type Test | 2500 VDC for 60 Seconds, Field Side to System |
| Output Status Indicators | 8 Yellow LEDs |
| Module and Network Status Indicators | 2 Green/Red LEDs |
| Compatible Terminal Bases | 1734-TB, 1734-TBS, 1734-TOP and 1734-TOPS |
| Terminal Base Screw Torque | 0.8 Nm for Applicable Screw-Type Base |
| Module Mounting | Compatible POINT I/O Terminal Base on DIN Rail |
| Wiring Category | Category 2 on Signal Ports |
| Wire Size | Determined by the Installed Terminal Base |
| Enclosure Type | Open-Style |
| Operating Temperature | -20°C to +55°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5-95% Non-Condensing |
| Maximum Surrounding Air Temperature | 55°C |
| Operating Vibration | 5 g at 10-500 Hz |
| Operating Shock | 30 g |
| Non-Operating Shock | 50 g |
| Maximum Altitude Without Derating | 2000 m |
| Pollution Degree | 2 |
| Dimensions (H × W × D) | 56.6 × 12.1 × 77.5 mm, Approximate Module Dimensions |
| Approximate Module Weight | 35.4 g |
| Manufacturer Documentation | 1734-IN018 Installation Instructions; 1734-UM001 User Manual; 1734-SG001 Selection Guide |
The Allen-Bradley 1734-OB8 provides eight discrete sourcing output channels in a compact POINT I/O module. Each channel supplies positive DC voltage to a compatible field load, supporting PLC-controlled switching of 24 VDC actuators, relay coils, indicator lights and other discrete devices.
Each output channel supports up to 1 A, while the combined current of all eight channels must not exceed 3 A. These are separate electrical limits and must both be satisfied. The documented surge capability is 2 A for 10 ms, repeatable every three seconds.
The module provides maximum output signal delays of 0.1 ms for both off-to-on and on-to-off transitions. Its nominal 24 VDC sourcing output is suitable for compatible discrete machine control applications requiring responsive digital switching.
With an approximate 12.1 mm module width, the 1734-OB8 supports space-efficient distributed I/O assemblies. It installs on a compatible POINT I/O terminal base and communicates with the controller through the POINTBus system and an appropriate communication adapter.
Eight yellow LEDs indicate the operating state of the corresponding digital outputs. Two additional green/red indicators provide module and network status information, assisting technicians during commissioning and troubleshooting.
The module operates with nominal 24 VDC field power and uses the POINT I/O power distribution arrangement. It provides 50 V continuous reinforced isolation between the field side and system, while the eight sourcing outputs are not individually isolated. Appropriate external load protection and suppression should be provided where required.
We support online purchase of the Allen-Bradley 1734-OB8 Digital Output Module. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
What is Allen-Bradley 1734-OB8?
Allen-Bradley 1734-OB8 is a Bulletin 1734 POINT I/O digital output module with eight non-isolated 24 VDC sourcing outputs. It is designed for compatible industrial control systems requiring distributed digital output switching.
How many output channels does 1734-OB8 have?
The module provides eight digital output channels arranged as one group of eight. All eight outputs are sourcing-type DC outputs, and they are not individually isolated from each other.
What voltage does 1734-OB8 use?
The nominal output and field supply voltage is 24 VDC. The documented on-state operating voltage range is 10-28.8 VDC. The load voltage and module field power arrangement must be compatible with the installed POINT I/O system.
What is the maximum output current of 1734-OB8?
Each channel can supply up to 1 A, but the combined output current of the module must not exceed 3 A. For example, using several outputs simultaneously requires adding their individual load currents to verify that the total remains within the module rating.
Is Allen-Bradley 1734-OB8 a sourcing or sinking output module?
The 1734-OB8 is a sourcing output module. When an output is energized, it supplies positive DC voltage to a connected load that returns to the DC common. The load wiring must use the correct sourcing-output polarity.
What is the difference between 1734-OB8 and 1734-OB8E?
Both modules provide eight 24 VDC sourcing outputs. The 1734-OB8 is the standard version without the additional channel-level electronic protection and fault diagnostics provided by the 1734-OB8E. They should not be considered functionally identical when the application depends on electronic protection or diagnostic reporting.
Does 1734-OB8 have electronic short-circuit protection?
The standard 1734-OB8 does not provide the electronically protected output functionality of the 1734-OB8E. Appropriate external circuit protection, load current verification and inductive-load suppression must be considered during installation.
What is the difference between 1734-OB8 and 1734-IB8?
The 1734-OB8 is an eight-point digital output module used to command compatible field loads. The 1734-IB8 is an eight-point digital input module used to receive signals from compatible field devices. Their functions, terminal assignments and controller configurations are different.
Which terminal bases are compatible with 1734-OB8?
The manufacturer lists 1734-TB, 1734-TBS, 1734-TOP and 1734-TOPS terminal bases for the eight-point sourcing output module. The terminal base must match the module's mechanical and wiring requirements, and its exact configuration should be checked before replacement.
Does 1734-OB8 need a separate communication adapter?
Yes. The 1734-OB8 is a POINT I/O output module rather than a standalone PLC or Ethernet adapter. It communicates through a compatible POINT I/O adapter over the POINTBus backplane, with the network protocol determined by the selected adapter.
What are the dimensions and operating temperature of 1734-OB8?
The approximate module dimensions are 56.6 × 12.1 × 77.5 mm, measured as height, width and depth, with a module weight of approximately 35.4 g. The operating temperature range is -20°C to +55°C, and the module is intended for installation within a suitable industrial enclosure.
What should be checked before ordering 1734-OB8?
Verify the exact catalog number 1734-OB8, hardware series, eight sourcing output channels, 24 VDC field supply, 1 A per-channel current limit, 3 A combined module limit, POINTBus power budget, compatible 1734 terminal base, output wiring assignments, network adapter compatibility, controller configuration, external circuit protection, inductive-load suppression and available installation space. When replacing an existing module, confirm that the application does not require the electronically protected 1734-OB8E version.
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| Brand | Allen-Bradley |
| Model Number | 1734-OB8 |
| Product Category | Digital Output Module |
| Product Family | POINT I/O |
| Product Bulletin | Bulletin 1734 |
| Module Type | Digital DC Sourcing Output Module |
| Number of Output Channels | 8 |
| Output Channel Configuration | 1 Group of 8 Non-Isolated Sourcing Outputs |
| Output Signal Type | Discrete DC, PNP Sourcing |
| Nominal Output Voltage | 24 VDC |
| On-State Output Voltage Range | 10-28.8 VDC |
| Maximum On-State Voltage Drop | 0.2 VDC |
| Minimum On-State Current Per Channel | 1 mA |
| Maximum Output Current Per Channel | 1 A |
| Maximum Combined Output Current Per Module | 3 A |
| Surge Output Current | 2 A for 10 ms, Repeatable Every 3 Seconds |
| Maximum Off-State Leakage Current | 0.5 mA at 28.8 VDC |
| Maximum Off-to-On Signal Delay | 0.1 ms |
| Maximum On-to-Off Signal Delay | 0.1 ms |
| Individual Output Channel Isolation | No |
| Integrated Electronic Output Protection | No; Standard Non-Protected Output Configuration |
| Integrated Per-Channel Fault Diagnostics | Not Provided as on the 1734-OB8E Variant |
| Output Terminal Assignments | Terminals 0-7 Correspond to Outputs 0-7 |
| Field Power Distribution | Via POINT I/O Field Power Bus and Compatible Power Distribution Hardware |
| External DC Power Supply Voltage | 24 VDC Nominal |
| External DC Power Supply Voltage Range | 10-28.8 VDC |
| External DC Power Supply Current for Module Electronics | 32 mA |
| POINTBus Supply Voltage | 5 VDC |
| Maximum POINTBus Current Draw | 75 mA at 5 VDC |
| Maximum Power Dissipation | 2 W at 28.8 VDC |
| Maximum Thermal Dissipation | 6.8 BTU/hr at 28.8 VDC |
| Isolation Voltage | 50 V Continuous, Reinforced Insulation, Field Side to System |
| Isolation Type Test | 2500 VDC for 60 Seconds, Field Side to System |
| Output Status Indicators | 8 Yellow LEDs |
| Module and Network Status Indicators | 2 Green/Red LEDs |
| Compatible Terminal Bases | 1734-TB, 1734-TBS, 1734-TOP and 1734-TOPS |
| Terminal Base Screw Torque | 0.8 Nm for Applicable Screw-Type Base |
| Module Mounting | Compatible POINT I/O Terminal Base on DIN Rail |
| Wiring Category | Category 2 on Signal Ports |
| Wire Size | Determined by the Installed Terminal Base |
| Enclosure Type | Open-Style |
| Operating Temperature | -20°C to +55°C |
| Storage Temperature | -40°C to +85°C |
| Relative Humidity | 5-95% Non-Condensing |
| Maximum Surrounding Air Temperature | 55°C |
| Operating Vibration | 5 g at 10-500 Hz |
| Operating Shock | 30 g |
| Non-Operating Shock | 50 g |
| Maximum Altitude Without Derating | 2000 m |
| Pollution Degree | 2 |
| Dimensions (H × W × D) | 56.6 × 12.1 × 77.5 mm, Approximate Module Dimensions |
| Approximate Module Weight | 35.4 g |
| Manufacturer Documentation | 1734-IN018 Installation Instructions; 1734-UM001 User Manual; 1734-SG001 Selection Guide |
The Allen-Bradley 1734-OB8 provides eight discrete sourcing output channels in a compact POINT I/O module. Each channel supplies positive DC voltage to a compatible field load, supporting PLC-controlled switching of 24 VDC actuators, relay coils, indicator lights and other discrete devices.
Each output channel supports up to 1 A, while the combined current of all eight channels must not exceed 3 A. These are separate electrical limits and must both be satisfied. The documented surge capability is 2 A for 10 ms, repeatable every three seconds.
The module provides maximum output signal delays of 0.1 ms for both off-to-on and on-to-off transitions. Its nominal 24 VDC sourcing output is suitable for compatible discrete machine control applications requiring responsive digital switching.
With an approximate 12.1 mm module width, the 1734-OB8 supports space-efficient distributed I/O assemblies. It installs on a compatible POINT I/O terminal base and communicates with the controller through the POINTBus system and an appropriate communication adapter.
Eight yellow LEDs indicate the operating state of the corresponding digital outputs. Two additional green/red indicators provide module and network status information, assisting technicians during commissioning and troubleshooting.
The module operates with nominal 24 VDC field power and uses the POINT I/O power distribution arrangement. It provides 50 V continuous reinforced isolation between the field side and system, while the eight sourcing outputs are not individually isolated. Appropriate external load protection and suppression should be provided where required.
We support online purchase of the Allen-Bradley 1734-OB8 Digital Output Module. If you need to make bulk purchases and inquire about other products, please contact our team to inform us of your purchase requirements. We will provide you with information such as quantity quotations, delivery dates, and transportation methods.
What is Allen-Bradley 1734-OB8?
Allen-Bradley 1734-OB8 is a Bulletin 1734 POINT I/O digital output module with eight non-isolated 24 VDC sourcing outputs. It is designed for compatible industrial control systems requiring distributed digital output switching.
How many output channels does 1734-OB8 have?
The module provides eight digital output channels arranged as one group of eight. All eight outputs are sourcing-type DC outputs, and they are not individually isolated from each other.
What voltage does 1734-OB8 use?
The nominal output and field supply voltage is 24 VDC. The documented on-state operating voltage range is 10-28.8 VDC. The load voltage and module field power arrangement must be compatible with the installed POINT I/O system.
What is the maximum output current of 1734-OB8?
Each channel can supply up to 1 A, but the combined output current of the module must not exceed 3 A. For example, using several outputs simultaneously requires adding their individual load currents to verify that the total remains within the module rating.
Is Allen-Bradley 1734-OB8 a sourcing or sinking output module?
The 1734-OB8 is a sourcing output module. When an output is energized, it supplies positive DC voltage to a connected load that returns to the DC common. The load wiring must use the correct sourcing-output polarity.
What is the difference between 1734-OB8 and 1734-OB8E?
Both modules provide eight 24 VDC sourcing outputs. The 1734-OB8 is the standard version without the additional channel-level electronic protection and fault diagnostics provided by the 1734-OB8E. They should not be considered functionally identical when the application depends on electronic protection or diagnostic reporting.
Does 1734-OB8 have electronic short-circuit protection?
The standard 1734-OB8 does not provide the electronically protected output functionality of the 1734-OB8E. Appropriate external circuit protection, load current verification and inductive-load suppression must be considered during installation.
What is the difference between 1734-OB8 and 1734-IB8?
The 1734-OB8 is an eight-point digital output module used to command compatible field loads. The 1734-IB8 is an eight-point digital input module used to receive signals from compatible field devices. Their functions, terminal assignments and controller configurations are different.
Which terminal bases are compatible with 1734-OB8?
The manufacturer lists 1734-TB, 1734-TBS, 1734-TOP and 1734-TOPS terminal bases for the eight-point sourcing output module. The terminal base must match the module's mechanical and wiring requirements, and its exact configuration should be checked before replacement.
Does 1734-OB8 need a separate communication adapter?
Yes. The 1734-OB8 is a POINT I/O output module rather than a standalone PLC or Ethernet adapter. It communicates through a compatible POINT I/O adapter over the POINTBus backplane, with the network protocol determined by the selected adapter.
What are the dimensions and operating temperature of 1734-OB8?
The approximate module dimensions are 56.6 × 12.1 × 77.5 mm, measured as height, width and depth, with a module weight of approximately 35.4 g. The operating temperature range is -20°C to +55°C, and the module is intended for installation within a suitable industrial enclosure.
What should be checked before ordering 1734-OB8?
Verify the exact catalog number 1734-OB8, hardware series, eight sourcing output channels, 24 VDC field supply, 1 A per-channel current limit, 3 A combined module limit, POINTBus power budget, compatible 1734 terminal base, output wiring assignments, network adapter compatibility, controller configuration, external circuit protection, inductive-load suppression and available installation space. When replacing an existing module, confirm that the application does not require the electronically protected 1734-OB8E version.
