The HONEYWELL 10101/2/1​ is a Fail-Safe Digital Input Module designed for critical safety applications within Honeywell’s control systems. It provides reliable monitoring of digital signals and defaults to a safe state in case of a failure.

Here is a summary of its key specifications:

💡 Module Overview and Function

The primary function of the 10101/2/1​ module is to monitor 16 discrete 24V DC signals from field devices like limit switches and push buttons in environments where safety is paramount. Its core value lies in its fail-safe design, which ensures that in the event of a power failure or internal fault, the module defaults to a predefined de-energized state. This guarantees that the overall safety system can maintain a safe condition, crucial for processes in industries like oil and gas, chemical, and power generation.

⚙️ Technical Details and Safety

The module is designed with high reliability in mind. It features minimal crosstalk between its input channels and operates within a wide range of environmental conditions. It was designed as a component for Honeywell’s FSC System, which uses Quadruple Modular Redundant (QMR) technology to achieve the highest level of functional safety certification (SIL 3). This makes it suitable for critical safety functions such as emergency shutdown, fire and gas detection, and burner management systems.

⚠️ Important Note on Availability

It is crucial to note that the Honeywell FSC System, which includes the 10101/2/1​ module, was officially discontinued on December 31. 2018. While the module may still be available as a spare part through various distributors, Honeywell’s primary support for existing users is now provided through its Lifecycle Support Services (LSS), which offers migration, repair, and spare parts options