Emerson SS4301T02 LS Digital Input CHARM

Overview

The Emerson SS4301T02 is a Logic Solver (LS) Digital Input CHARM module for DeltaV™ Electronic Marshalling. It monitors 24V DC dry contact signals from field devices such as switches, sensors, and relays. This compact, plug-and-play module simplifies system integration and supports pulse counting and precise event time stamping. It ensures reliable signal detection while maintaining galvanic isolation between field circuits and the control system.

Technical Specifications

• Model: SS4301T02

• Type: LS Digital Input CHARM

• Input Signal Type: 24V DC dry contact

• Channels: Single-channel CHARM

• Input Voltage Range: 18–30V DC

• Input Current: Typically <2 mA

• Isolation: Galvanic isolation between field and system

• Pulse Counter Support: Yes, supports 75–120 Hz pulse counting

• Time Stamping: Control module-level; optional Sequence-of-Events ±0.25 ms

• Mounting: Plugs into CHARMs baseplate (DeltaV system)

• Operating Temperature: -40°C to +70°C

• Humidity Range: 5% to 95% RH (non-condensing)

• Detection Level for On: >2.25 mA (<5.3 kΩ)

• Detection Level for Off: <1.75 mA (>8.2 kΩ)

• Channel Impedance: 4.8 kΩ

• Wetting Voltage: 22.5V ±5%, current limited to 12.5 mA nominal

• Field Circuit Protection: 12.5 mA current limiting, field wiring disconnect

• CHARM Power Requirement: 18 mA max @ 24 VDC

• CHARM Heat Dissipation: 0.33 W

• Fault Detection Capable: Short circuit <100 Ω; good status 400 Ω–40 kΩ; open circuit >75 kΩ

• Configurable Channel Type: Dry contact or discrete state sensor (<2 Hz)