Allen Bradley 1756-OB16I ControlLogix DC Digital Output Module

The Allen Bradley 1756-OB16I is a ControlLogix DC digital output module that has Sixteen (16) individually isolated points. It does not have internal however, external IFM can be used to protect outputs. The recommended fuse type for this module is the 5x20mm 4 A quick-acting fuse supplied by with part number SOC p/n MQ2-4A. For the 1756-OB16I module, compatible Remote Terminal Blocks (RTB) are 1756-TBCH 1756-TBS6H, which both have 36 pins. RTB are required to provide signal termination point.

This module also has the following communication formats output data, listen-only output data, rack optimization, listen-only rack optimization, and scheduled output data. It also allows the selection of states in Fault or Program per point, with Hold Last State, On, or Off as the choices available for each and set by default for both.

It is a 12/24V DC sink/source output module with an operating voltage range of 10 to 30V DC. Its backplane current is 350 mA at 5.1V and 2.5 mA at 24V and has a total backplane power of 1.8 W. Its maximum current per point is 2 A at 30 Degrees Celsius and 1 A at 60 Degrees Celsius (linear derating), while its maximum current per module is 8 A at 30 Degrees Celsius and 4 A at 60 Degrees Celsius (linear derating). Its surge current per point is repeatable every 2 s at 4 A for 10 ms per point. It also has a 1 mA per point minimum load current, a 1.2V DC at 2 A maximum on-state volume drop, and a 0.5 mA per point maximum off-state leakage current per point.

The 1756-OB16I module has also been routine-tested at 1350V AC for 2 s. It has an outputs-to-backplane continuous isolation voltage of 250V and an output-to-output continuous isolation voltage of 125V. It also has an output delay time of a maximum of 1 ms from off to on and a maximum of 2 ms from on to off. Power dissipation of the 1756-OB16I module is 3.6W at 60 Degrees Celsius (maximum) and its thermal dissipation is 12.28 BTU/hr. It has an operating temperature range of 0 to 60 Degrees Celsius and a non-operating temperature range of -40 to 85 Degrees Celsius.

The Allen Bradley 1756-OB16I is a 1756 ControlLogix Discrete output module that supports sinking and sourcing configuration and operates at a Voltage category of 12/24VDC. This output module is a single slot module that directly installs to the 1756 chassis.

It has Sixteen (16) individually isolated channels that allows wiring of different voltage sources to every output channel as long as the external power is connected to a 12/24 VDC source. It may also be terminated following a non-isolated wiring scheme where the DC (+) and DC (-) may be connected to a common voltage source.

This output module has integrated Sixteen (16) LED indictors to indicate the module’s operation and depict the active output channel. When a channel is active, the corresponding LED is energized or ON otherwise, it is OFF. The pilot duty rating of this module is 2A with a maximum OFF to ON output delay time of 1 ms and ON to OFF maximum output delay of 2 ms. This module may be used to energize electrical loads such as Relays, Pilot Lamps, Indicators, Siren, Horn, Buzzer, Solenoid and may other loads. When driving inductive loads, it is ideal to install an external surge protection device as high-inductive loads have high inrush current.

This module also features individually configured safe states. These safe states may be defined when the ControlLogix processor is changed from Run to Program mode or from Run to Faulted mode. By defining the safe state of each channel, unwanted turning OFF and ON of a channel may be prevented. This allows safe operation of a machine or process and prevent accidents.

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Specification Sheet .pdf