Allen-Bradley 1746-OB16 SLC 500 16-Point DC Digital Output Module
16-Point DC Transistor Output
10–50V DC Output Signal Range
1746-OB16 manual
Place of Origin:
USA
Brand Name:
Allenbradley
16-Point DC Transistor Output
,10–50V DC Output Signal Range
,1746-OB16 manual
The Allen-Bradley 1746-OB16 is a 16-channel DC transistor output module for the SLC 500 programmable controller system. Its sourcing output arrangement switches external DC field circuits through individual output points.
It is used in SLC 500 installations where controller outputs operate DC field devices. For replacement sourcing, check the installed catalog number, field supply, output loading and chassis arrangement before ordering.
Technical Specifications
Application & Failure Scenarios
The 1746-OB16 is installed in an SLC 500 I/O chassis to provide discrete DC output signals to field devices. In a machine or process-control sequence, these outputs can be used to switch compatible DC control circuits.
Installed Control Application
Used as part of an SLC 500 controller's discrete output section, where individual output points control external DC field circuits.
Output Point Fails to Switch
A PLC command is present but the connected field device does not respond. Maintenance teams may investigate the output module, field supply, wiring and load circuit.
Intermittent Field Response
Unstable output operation can interrupt machine sequences, cause repeated troubleshooting and delay the return of equipment to normal operation.
Replacement During a Shutdown
When the installed module is identified as faulty, sourcing the correct catalog number helps reduce the time required for repair planning and system restart.
Wiring & Installation
Before Installation
Disconnect power to the chassis before installing, removing or wiring the module. Confirm the intended slot and check the field wiring against the applicable SLC 500 installation instructions.
Module Insertion
Align the module circuit board with the chassis card guide and slide the module into the chassis until the retaining tabs lock.
Field Wiring
Route field wiring down and away from the module, and secure the wiring appropriately. Observe the specified conductor and terminal limits.
Removal
Use the module release tabs to remove the module from its slot after the chassis power has been disconnected.
Inspection & Troubleshooting
When an output-controlled device does not respond, trace the control path before deciding whether the module needs replacement.
Lifecycle & Replacement Considerations
Lifecycle category: Engineering Replacement.
Rockwell Automation lists the 1746-OB16 as discontinued. The engineering replacement category does not identify a specific drop-in replacement part. Before selecting another module, compare output type, field voltage, current requirements, terminal arrangement and controller configuration.
Manufacturer Documentation
Includes 1746-OB16 specifications, wiring information, installation procedures and terminal wiring limits.
Provides SLC 500 I/O module selection information, including sourcing DC output module characteristics.
Referenced by Rockwell Automation for additional information on inductive-load surge suppression and output transient pulses.
Search reference: 1746-OB16 manual and SLC 500 digital I/O installation documentation.
Frequently Asked Questions
Is the 1746-OB16 a sourcing or sinking output module?
It is a sourcing DC transistor output module for the SLC 500 platform.
What is the operating output signal range?
The specified output signal range is 10–50V DC. The module is categorized as a 24V DC signal output module.
What is the continuous current limit per output point?
The limit is 0.50 A per point at 30°C and 0.25 A per point at 60°C. The maximum continuous current per module is also temperature-dependent.
Can the 1746-OB16E be treated as the same module?
No. The 1746-OB16E is a separate catalog number with different electrical specifications. Check the exact part number and system requirements before ordering.
What should be checked before installing a replacement?
Check the catalog number, sourcing output arrangement, field supply, load current, wiring and chassis configuration. Disconnect chassis power before installation or wiring.
Related Models
Delivery & Warranty
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