1756-OB16I Allen Bradley ControlLogix Discrete 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.

The output channels of this module feature a configurable safe state position ne the controller’s mode is changed to Program and Controller fault.

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.

1756-OB16I