The Allen Bradley 1756-OB16I is a 16-point isolated DC digital output module for the ControlLogix platform. Its core function is to convert control signals from the controller into high-current DC outputs to drive actuators, valves, indicators, and other field devices, with each channel individually isolated for enhanced system reliability.
Item No :
1756-OB16IOrder(MOQ) :
1Payment :
EXWProduct Origin :
USAShipping Port :
Wuhan, Hubei, ChinaLead Time :
3-5 daysWeight :
0.5kgProduct Overview: 1756-OB16I ControlLogix 16 Point D/O Module
The Allen‑Bradley 1756‑OB16I is a 16‑point digital output module for the ControlLogix chassis with individually isolated outputs. It operates at 10‑30V DC sourcing current and includes diagnostic features such as open‑wire detection and load fault protection for each output point.
Brand Name: Allen Bradley
Product Name: 1756-OB16I
Place of Origin: USA
Range of Product: ControlLogix
Warranty: 1Year
Our Service
Key Parameters
| Item | Specifications / Features |
|---|---|
| Number of Channels | 16 individually isolated digital outputs |
| Output Type | Transistor, sink/source configurable |
| Voltage Category | 12/24V DC (operating range: 10-30V DC) |
| Current per Point | 2A @ 30°C / 1A @ 60°C (linear derating) |
| Current per Module | 8A @ 30°C / 4A @ 60°C |
| System Platform | Allen-Bradley ControlLogix 1756 chassis |
| Output Delay (OFF→ON) | 1 ms maximum |
| Output Delay (ON→OFF) | 2 ms maximum |
| Isolation Voltage | 250V continuous between outputs |
| Recommended RTB | 1756-TBCH or 1756-TBS6H (36-pin) |
| Diagnostics | Per-point fault status; configurable fault/program state (Hold Last State, On, Off) |
| Certifications | ATEX, CE, IECEx, UL, CSA, RCM, ABS, EAC |
Individual Channel Isolation: The module's standout feature is the per-point isolation, which means each of the 16 outputs can be configured with its own voltage source. This protects the module and controller from shorts and faults in the field wiring, significantly improving system reliability .
High Current Capacity and Fast Switching: The module can handle up to 2A per point, making it capable of driving high-power loads directly. It also features fast output response times with a maximum OFF→ON delay of 1 ms and ON→OFF delay of 2 ms, suitable for high-speed control applications .
Flexible Configuration and Diagnostics: The module supports configurable safe state positions (Hold Last State, On, or Off) for each point in case of a controller fault or Program mode, which is critical for fail-safe system design . Built-in diagnostics provide per-point fault status via the backplane, simplifying maintenance and troubleshooting .
The 1756-OB16I is widely used in industrial automation for driving digital outputs in ControlLogix systems, such as:
Machine Control: Activating solenoids, contactors, and pilot lights in packaging, material handling, and assembly equipment.
Process Automation: Controlling valves, pumps, and alarms in discrete manufacturing and process control applications.
High-Reliability Systems: Applications requiring individual output isolation to protect against field wiring faults and ensure high availability.
| Product/Model | Type | Brief Description |
|---|---|---|
| 1756-TBCH | Required Accessory | 36-pin screw clamp removable terminal block (RTB) for wiring field devices to the module |
| 1756-TBS6H | Required Accessory | 36-pin spring clamp RTB for vibration-resistant wiring |
| 1756-JMPR | Optional Accessory | Jumper bar for daisy-chaining power connections across multiple RTBs |
| Product/Model | Type | Brief Description |
|---|---|---|
| 1756-OB16 | Alternative (Non-Isolated) | 16-point output module with similar functionality but without individual channel isolation; lower cost for non-critical applications |
| 1756-OB32 | Alternative (Higher Density) | 32-point output module for applications requiring more points in a single slot; lacks per-channel isolation |
| 1756-OB8I | Alternative (Lower Channel) | 8-point isolated output module for applications requiring fewer isolated outputs |
| 1756-OB16D | Alternative (Diagnostic) | 16-point output module with enhanced diagnostics including open-wire detection |
| 1756-OB16E | Alternative (Electronic Fusing) | 16-point output module with electronic fusing and diagnostic capabilities |
| 1756-OB16IEF | Alternative (Enhanced) | 16-point isolated output with electronic fusing and enhanced diagnostics |
| 1756-OB16IS | Alternative (Enhanced) | 16-point isolated output with enhanced diagnostics and short-circuit protection |
| Product/Model | Type | Brief Description |
|---|---|---|
| 1756-A7 / A13 | Chassis | 7-slot or 13-slot ControlLogix chassis for mounting the module |
| 1756-PA72 / PA75 | Power Supply | ControlLogix power supply modules providing backplane power |
| Studio 5000 | Software | Programming and configuration software for ControlLogix controllers |
| 1756-CP3 | Cable | Serial programming cable for initial controller setup |
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