Description
The Emerson DeltaV SE4301T02 is a 24 V DC discrete input (DI) characterization module (CHARM) designed for the DeltaV Electronic Marshalling architecture. It functions as a single-channel, low-side sensing interface for isolated dry contacts or discrete state sensors. Operating within a CHARM I/O Card (CIOC) baseplate assembly, the module provides localized signal conditioning, galvanic isolation, and digital conversion directly at the termination field panel.
Commercial Supply Status
- Condition: New Original, Factory Sealed
- Availability: In stock
- Lead Time: 1–3 business days
- Warranty: 12 months
- Pricing Note: Price subject to market conditions; contact us for a firm quote.
Field Engineering & Integration Notes
In field deployments utilizing DeltaV Electronic Marshalling, the SE4301T02 removes the need for traditional cross-wiring cabinets. Because the channel types are designated at the individual module level, engineers can mix DI, DO, and analog modules across the same 12-slot baseplate grid.
During 2 AM troubleshooting of flickering discrete alarms, navigate to the DeltaV Diagnostics explorer to monitor channel status. The SE4301T02 contains active fault detection circuitry that identifies line faults on the field loop. It flags a short circuit if resistance drops below 100\ \Omega or an open circuit if loop resistance exceeds 75\ k\Omega. When utilizing this module for pulse counting applications up to 10\ kHz, verify that the field instrument output generates a minimum pulse width of 50\ \mus. Ensure the mechanical keying sequence on the terminal block matches the DI classification to prevent module mismatch faults if hardware changes occur while the baseplate is powered.
Technical Specifications
| Parameter | Value |
| Product Type | Characterization Module (CHARM) Discrete Input |
| Part Number | SE4301T02 |
| Sensor Compatibility | 24 V DC Dry Contacts / State Sensors |
| Sensing Configuration | Low-Side Sense |
| Wetting Voltage | 22.5 V DC (\pm 5\%), current limited to 12.5 mA nominal |
| Detection Threshold – ON | > 2.25 mA (< 5.3 k\Omega) |
| Detection Threshold – OFF | < 1.75 mA (> 8.2 k\Omega) |
| Channel Impedance | 4.8 k\Omega |
| Pulse Input Capability | 0.1 Hz to 10 kHz (50\ \mus minimum pulse width) |
| Galvanic Isolation | Factory tested to 1,000 V DC |
| Field Protection | 12.5 mA internal current limiting circuit |
| CHARM Power Demand | 22 mA maximum @ 24 V DC |
| Module Heat Dissipation | 0.33 W |
| Operating Temperature | -40 to +70 ^{\circ}C (-40 to +158 ^{\circ}F) |
Configurable Channel Modes
The internal software definition inside DeltaV allows the hardware channel to fulfill two distinct process operations:
- Discrete Input: Monitors standard mechanical limit switches, proximity sensors, or auxiliary relay dry contacts changing state at frequencies lower than 2 Hz.
- Pulse Count: Registers high-speed pulse trains from flowmeters or rotational speed sensors ranging from 0.1 Hz up to a maximum threshold of 10 kHz.
Frequently Asked Questions
- Q: Does the SE4301T02 module support line monitoring for wire-break detection?
- A: Yes, it is fault detection capable. However, for standard dry contacts, you must install external end-of-line (EOL) resistors in parallel and series at the field device terminal box. This enables the module to distinguish a closed contact from a short circuit, and an open contact from a severed field wire.
- Q: Can I hot-swap this module while the CHARM baseplate is actively powered?
- A: Yes. The DeltaV Electronic Marshalling baseplate bus is engineered for hot-swapping. The single-channel design allows you to remove and insert individual modules without interrupting communication lines or power distribution to the remaining 11 channels on the same sub-rack.
- Q: What is the mechanical difference between this module and a high-side sense module?
- A: The SE4301T02 low-side sense module measures current returning through the return leg of the loop, keeping the sensor reference pulled toward the negative rail. High-side sensors switch the positive feeding leg. Ensure your field instrument grounding schematic aligns with low-side rules before termination to prevent ground loops. Verify details with the OEM installation datasheet.
- A: The SE4301T02 low-side sense module measures current returning through the return leg of the loop, keeping the sensor reference pulled toward the negative rail. High-side sensors switch the positive feeding leg. Ensure your field instrument grounding schematic aligns with low-side rules before termination to prevent ground loops. Verify details with the OEM installation datasheet.
