Product Overview

The Emerson 8121-DI-DC-05 Digital Input Module is engineered for reliable signal acquisition in harsh industrial environments. With 16 non-isolated digital input channels, it supports 24VDC logic levels and is ideal for monitoring switches, sensors, and contact closures across a wide range of applications.

Moreover, the module offers selectable input filtering from 2 to 512 milliseconds, allowing users to optimize response time and noise immunity based on system requirements. In addition, it includes an optional pulse counting feature, enabling accurate tracking of high-speed digital events such as flowmeter pulses or encoder signals.

The 8121-DI-DC-05 is part of the PAC8000 Remote I/O family, known for its modularity, environmental resilience, and compatibility with hazardous area installations. Therefore, it is a trusted solution for distributed control systems in oil & gas, power, and manufacturing sectors.

Technical Specifications

Typical Applications

The 8121-DI-DC-05 is widely used in industries requiring high-density digital input monitoring. For instance:

• Oil & Gas: Monitors valve positions, limit switches, and safety interlocks on offshore platforms

• Power Generation: Tracks turbine status, breaker positions, and alarm conditions

• Water & Wastewater: Interfaces with level switches, flow sensors, and pump feedback

• Manufacturing: Captures machine status, operator inputs, and safety gate signals

• Chemical Processing: Supports hazardous area installations with robust diagnostics

In addition, its pulse counting capability makes it ideal for applications involving flow measurement or event tracking.

System Integration Experience

The 8121-DI-DC-05 integrates seamlessly with Emerson’s PAC8000 I/O system, offering open architecture support for DeltaV, Ovation, and third-party DCS platforms. Moreover, its hot-swappable design and LED diagnostics reduce downtime and simplify maintenance.

Therefore, system integrators benefit from faster commissioning, reduced wiring complexity, and long-term reliability in mission-critical environments.

FAQ

Q: What voltage does the 8121-DI-DC-05 support?
A: It supports 18–30VDC digital input signals.

Q: Can it count pulses from flowmeters or encoders?
A: Yes, it includes an optional pulse counting feature per channel.

Q: Is it suitable for hazardous areas?
A: Yes, it’s designed for use in Class I, Division 2 and similar environments.

Q: How fast can it respond to input changes?
A: Input filtering is selectable from 2 to 512 milliseconds.

Q: Does it support hot-swapping?
A: Yes, the module is hot-swappable for easy maintenance and replacement.