Application Scenarios
A packaging line used an SLC 500 controller to operate pneumatic valves, conveyor interlocks and status indicators. During a maintenance outage, technicians discovered that several output modules had cracked terminal blocks and inconsistent wiring. Replacing each field device would have been costly and unnecessary because the control logic and SLC 500 rack were still functional.The plant standardized the repair around tested 1746-OB16 modules. Each module provided 16 sourcing outputs and a removable terminal block, allowing the maintenance team to transfer verified wiring without reconstructing the entire panel. After reinstallation, technicians used the per-point LEDs to confirm output states and completed a step-by-step check of valves, contactors and alarms.The project’s value was not simply the addition of 16 new outputs. The 1746-OB16 restored a clean, supportable interface between the controller and field devices. For a legacy SLC 500 system, that can extend operational life while a long-term migration strategy is developed.
Parameter
| Main Parameters | Value / Description |
|---|---|
| Product Model | 1746-OB16 |
| Manufacturer | Allen-Bradley, a Rockwell Automation brand |
| Product Category | Digital DC output module |
| Control Platform | SLC 500 |
| Number of Outputs | 16 sourcing outputs |
| Output Type | Current sourcing / PNP-style switched positive output |
| Operating Voltage | 10–50 V DC |
| Nominal Load Voltage | 24 V DC in most industrial applications |
| Continuous Current per Point | 0.5 A at 30 °C; 0.25 A at 60 °C |
| Continuous Current per Module | 8 A at 30 °C; 4 A at 60 °C |
| Surge Current per Point | 3 A for 10 ms |
| On-State Voltage Drop | 1.2 V DC maximum at 0.5 A |
| Off-State Leakage Current | 1.0 mA maximum |
| Minimum Load Current | 1.0 mA per point |
| Signal Delay | Off-to-on: 0.1 ms maximum; on-to-off: 1.0 ms maximum with a resistive load |
| Backplane Current Draw | 280 mA at 5 V DC; 0 mA at 24 V DC |
| Heat Dissipation | 0.388 W per point; 7.6 W maximum for the module |
| Isolation | 1500 V AC between outputs and backplane for 1 second |
| Communication Circuit Isolation | 500 V DC |
| Status Indicators | 16 LEDs, one for each output point |
| Terminal Block | Removable terminal block for simplified module replacement |
| Mounting Method | Single-slot installation in a compatible 1746 chassis |
| Slot Position | Any available I/O slot; the processor slot is not used for ordinary I/O |
| Chassis Compatibility | 1746-A4, 1746-A7, 1746-A10 and 1746-A13 chassis, subject to system capacity |
| Programming Software | RSLogix 500 |
| Dimensions | 144.5 × 34.6 × 130.2 mm |
| Weight | 0.272 kg |
| Operating Temperature | 0 °C to +60 °C |
| Storage Temperature | −40 °C to +85 °C |
| Relative Humidity | 5% to 95%, non-condensing |
| Certifications | UL, CSA and CE; confirm the exact approvals on the supplied unit |
| Lifecycle Status | Discontinued; no longer available for sale from Rockwell Automation as of 30 September 2024 |
| Replacement Category | Engineering replacement |
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