1756-OB16D AB
About 1756-OB16D
Allen Bradley 1756-OB16D is a ControlLogix DC diagnostic output module. It has 16 diagnostic outputs available, each with 8 points, and has been electronically fused on top of each point. You can install it in any available slot in a compatible ControlLogix chassis. However, a 36 position detachable junction box housing (RTB) is required for this purpose. The RTB can be 1756-TBCH or 1756-TBS6H. Before installing the module using RTB, it is important to install the chassis and power supply, and ground them.
The 1756-OB16D module shares the following common features with other output modules: output data echo, multiple output point densities, configurable point level output states, electronic fuses, and isolated and non isolated output modules. It also allows you to configure various functions of the module, especially no-load detection, output verification detection, output state in fault mode, output state in program mode, transition from program state to fault state, and diagnostic latch.
The short-term trip diagnosis function of the 1756-OB16D module is 8 A for 180 ms (minimum) and 10 A for 120 ms (minimum). The no-load function is only used for off state detection, and the output verification is only used for on state detection. Pulse testing has a user configurable maximum pulse width. This module also allows you to configure the fault status and program mode status of each point, with the default setting being “off” and other options being “on” and “keep last state”.
This output module has a working voltage range of 19.2 to 30V DC and a 24V DC power supply voltage category. It also has a minimum load current of 3 mA per point, a maximum off state leakage current of 1 mA per point, and a maximum on voltage drop of 1.2 V DC at 2 A. The backplane current is 140 mA at 24V DC and 250 mA at 5.1V DC, with a total power of 4.64 W. Its linear derating output current rating is 2 A maximum at 30 degrees Celsius (80 degrees Fahrenheit), 1 A maximum at each point at 60 degrees Celsius (140 degrees Fahrenheit), 8 A maximum at 30 degrees Celsius, and 4 A maximum per module at 60 degrees Celsius. The surge current module of 1756-OB16D is 4 A per point, 10 ms per point, and can be repeated every second. The isolation voltage of the group to group and user to system was tested at 2546V for 1 second, both with a maximum continuous voltage of 250V AC.
