Output Module | Allen-Bradley 1756-OA16I
The 1756-OA16I is a 16-point digitally isolated AC output module designed for the Allen-Bradley ControlLogix platform. This module operates across a voltage range of 74 to 265 VAC (nominal 120/240 VAC) and features sixteen individually isolated outputs, providing high flexibility and noise immunity for heavy-duty industrial switching applications.
Module Overview and Specifications
The 1756-OA16I module delivers reliable AC load control with individual point isolation, preventing ground loops and protecting controller hardware from cross-channel electrical interference.
| Parameter | Specification |
|---|---|
| Model | 1756-OA16I |
| Brand | Allen-Bradley |
| Series / Product Line | ControlLogix |
| Module Type | Digital AC Output Module |
| Number of Outputs | 16 individually isolated outputs |
| Operating Voltage Range | 74–265 VAC |
| Nominal Output Voltage | 120/240 VAC |
| Continuous Current per Point | 2 A at 30 °C (linear derating to 1 A at 60 °C) |
| Continuous Current per Module (Max) | 5 A at 30 °C (linear derating to 4 A at 60 °C) |
| OFF-State Leakage Current | 3 mA per point |
| Output Delay Time (OFF to Now / OFF to ON) | 9.3 ms @ 60 Hz; 11 ms @ 50 Hz |
| Backplane Current Draw | 225 mA (or 300 mA) @ 5.1 VDC; 3 mA @ 24 VDC |
| Power Dissipation (Max) | 5.5 W at 60 °C |
| Isolation Voltage | 50 V continuous |
| Compatible Removable Terminal Blocks (RTB) | 1756-TBCH, 1756-TBS6H |
| Weight | 1.31 lbs (0.60 kg) |
Electrical Performance and Current Derating
Each output point supports up to 2 A of continuous current at an ambient temperature of 30 °C (86 °F). As operating temperatures rise toward the maximum limit of 60 °C (140 °F), continuous current ratings undergo a linear derating down to 1 A per point and 4 A total per module to protect internal circuitry from overheating. Total module current is capped at a maximum of 5 A at 30 °C.
Wiring and Termination
Field side connections are established via compatible Removable Terminal Blocks (RTB), specifically the 1756-TBCH or 1756-TBS6H. Because the sixteen outputs are individually isolated, each channel can interface with independent AC load circuits operating at separate phases or potential levels, provided they remain within the 74–265 VAC operational threshold.
Frequently Asked Questions
Q: Can the 1756-OA16I module drive inductive loads such as AC solenoids and motor starters? A: Yes, AC output modules can drive inductive loads, but appropriate surge suppressors (such as MOV or RC networks) should be installed across inductive device terminals to limit voltage transients and extend contact life.
Q: Are the 16 output channels sharing a common return? A: No, the 1756-OA16I features sixteen individually isolated outputs, meaning each point has dedicated isolated terminals allowing connection to completely separate AC supply circuits.
Output Module | Allen-Bradley 1756-OA16I
Output Module | Allen-Bradley 1756-OA16I
The 1756-OA16I is a 16-point digitally isolated AC output module designed for the Allen-Bradley ControlLogix platform. This module operates across a voltage range of 74 to 265 VAC (nominal 120/240 VAC) and features sixteen individually isolated outputs, providing high flexibility and noise immunity for heavy-duty industrial switching applications.
Module Overview and Specifications
The 1756-OA16I module delivers reliable AC load control with individual point isolation, preventing ground loops and protecting controller hardware from cross-channel electrical interference.
| Parameter | Specification |
|---|---|
| Model | 1756-OA16I |
| Brand | Allen-Bradley |
| Series / Product Line | ControlLogix |
| Module Type | Digital AC Output Module |
| Number of Outputs | 16 individually isolated outputs |
| Operating Voltage Range | 74–265 VAC |
| Nominal Output Voltage | 120/240 VAC |
| Continuous Current per Point | 2 A at 30 °C (linear derating to 1 A at 60 °C) |
| Continuous Current per Module (Max) | 5 A at 30 °C (linear derating to 4 A at 60 °C) |
| OFF-State Leakage Current | 3 mA per point |
| Output Delay Time (OFF to Now / OFF to ON) | 9.3 ms @ 60 Hz; 11 ms @ 50 Hz |
| Backplane Current Draw | 225 mA (or 300 mA) @ 5.1 VDC; 3 mA @ 24 VDC |
| Power Dissipation (Max) | 5.5 W at 60 °C |
| Isolation Voltage | 50 V continuous |
| Compatible Removable Terminal Blocks (RTB) | 1756-TBCH, 1756-TBS6H |
| Weight | 1.31 lbs (0.60 kg) |
Electrical Performance and Current Derating
Each output point supports up to 2 A of continuous current at an ambient temperature of 30 °C (86 °F). As operating temperatures rise toward the maximum limit of 60 °C (140 °F), continuous current ratings undergo a linear derating down to 1 A per point and 4 A total per module to protect internal circuitry from overheating. Total module current is capped at a maximum of 5 A at 30 °C.
Wiring and Termination
Field side connections are established via compatible Removable Terminal Blocks (RTB), specifically the 1756-TBCH or 1756-TBS6H. Because the sixteen outputs are individually isolated, each channel can interface with independent AC load circuits operating at separate phases or potential levels, provided they remain within the 74–265 VAC operational threshold.
Frequently Asked Questions
Q: Can the 1756-OA16I module drive inductive loads such as AC solenoids and motor starters? A: Yes, AC output modules can drive inductive loads, but appropriate surge suppressors (such as MOV or RC networks) should be installed across inductive device terminals to limit voltage transients and extend contact life.
Q: Are the 16 output channels sharing a common return? A: No, the 1756-OA16I features sixteen individually isolated outputs, meaning each point has dedicated isolated terminals allowing connection to completely separate AC supply circuits.
