1785-L20B Allen Bradley Digital In/Output Module.

1785-L20B     Allen-Bradley       Processor modules, programmable controllers

Allen-Bradley 1771-OBN Output Module: Detailed Description

The Allen-Bradley 1771-OBN is a discrete (digital) output module from the 1771 I/O family, which was part of the older PLC-5 programmable logic controller system. It's important to note that Rockwell Automation has discontinued the 1771 family. As of December 31, 2015, the 1771-OBN was officially discontinued and is no longer available for sale as a new product from Rockwell. This means you will likely find it on the used or surplus market.  

Product Parameters/Specifications:

Here are the key specifications for the 1771-OBN:

• Output Type: DC sourcing (also known as PNP). This means the module provides the positive voltage to the load.

•  Number of Outputs: 32 outputs.

   

•  Voltage Range: 10-30V DC.

   

• Current per Output: 0.5 A (500 mA) maximum.

• Backplane Current Load: 0.45 A at 5V DC.

• Module Location: It mounts in a 1771 I/O chassis.

• Wiring: Screw terminals for field wiring connections.

• Indicators: LED indicators for each output point to show the output status (on/off).

Product Advantages (When it was actively sold):

• High Density: 32 outputs in a single module offered a compact solution.

• Reliability: Allen-Bradley products were known for their industrial robustness.

• Ease of Use: Simple wiring and clear status indicators.

• Integration with PLC-5: Seamless integration within the PLC-5 system.

Disadvantages (Now):

• Obsolete: The biggest disadvantage is that it is discontinued. This means:

• No new stock from the manufacturer.

• Limited availability of spare parts.

• No official support or updates.

• Higher risk of failure due to age.

Static Sequence Control and General-Purpose Drive Controller Modules:

• Static Sequence Control: This refers to a pre-defined set of control actions executed in a specific order. In the context of a PLC system like PLC-5 (which used the 1771-OBN), the PLC program would define these sequences. The 1771-OBN would then be used to switch outputs on or off according to the sequence logic.

• General-Purpose Drive Controller Modules: These are external devices used to control motors, valves, and other actuators. The 1771-OBN would act as the interface between the PLC and these drive controllers. The PLC program would send signals to the 1771-OBN, which would in turn energize or de-energize the appropriate outputs to control the drives.

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