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Product Overview
The Schneider 140SAI94000S is an 8-channel safety analog input module for the Modicon Quantum automation platform. It accepts 4–20 mA current signals with 16-bit resolution and provides isolated analog acquisition for safety-related control applications. Schneider documentation specifies eight inputs, a 0–25 mA linear measuring range, 287 Ω input impedance, and 1500 VAC isolation between the channels and bus. The module also supports diagnostic indication through dedicated LEDs for communication, input status, external faults, and internal channel faults.
This module is intended for safety-oriented Quantum PLC architectures rather than standard analog input applications. Schneider has discontinued the product for new sales and recommends the Modicon X80 BMXSAI0410 as a replacement path. Standard service is currently indicated through December 31, 2029, making lifecycle planning particularly relevant for existing installations.
Technical Specifications — 140SAI94000S
| Parameter | Value |
|---|---|
| Product Model | 140SAI94000S |
| Manufacturer | Schneider Electric |
| Product Type | Safety Analog Input Module |
| System | Modicon Quantum |
| Number of Inputs | 8 |
| Input Signal | 4–20 mA |
| Resolution | 16 bits |
| Linear Measuring Range | 0–25 mA |
| Input Impedance | 287 Ω |
| Absolute Maximum Input | 35 mA |
| Accuracy | ±0.3%; ±0.35% of full scale maximum |
| Isolation, Channel to Bus | 1500 VAC for 60 s |
| Isolation, Channel to Channel | 500 VAC for 60 s |
| Update Time | 15 ms |
| Power Dissipation | Approx. 3.5 W |
| Bus Current Requirement | Approx. 400 mA |
| Mounting | Modicon Quantum rack |
| Typical Interface | 40-way terminal block |
| Safety Certification | TÜV Rheinland, SIL2-related application; verify complete system architecture |
| Lifecycle Status | Discontinued; standard service indicated through Dec. 31, 2029 |
Specifications are based primarily on Schneider documentation and associated technical references.
Schneider 140SAI94000S
Key Features and Benefits — 140SAI94000S
- Eight-channel 4–20 mA analog acquisition.
- 16-bit measurement resolution for process-variable monitoring.
- Galvanic isolation between channels and the Quantum bus.
- Built-in diagnostic indication for communication and channel faults.
- Designed for safety-related Quantum PLC applications.
- 15 ms update time supports process monitoring and control loops.
- Severe-environment coating is documented for the Quantum safety I/O family.
For legacy installations, retaining an original spare can still be practical, particularly where validated safety logic and existing cabinet wiring are already established.
Related Models
BMXSAI0410 — Schneider’s recommended Modicon X80 replacement, featuring four isolated analog inputs and 4–20 mA capability.
140SDI95300S — Quantum safety discrete input module for 24 VDC digital signals.
140SDO95300S — Quantum safety discrete output module for 24 VDC discrete loads.
140CPU65160S — Quantum standalone safety CPU used with compatible safety I/O architecture.
Installation and Maintenance — 140SAI94000S
Before replacement, isolate the relevant PLC rack and follow the plant’s approved electrical safety procedure. Record channel assignments, transmitter wiring, terminal-block configuration, and application parameters before removing the module.
Verify loop current, polarity, shielding, and grounding during commissioning. Safety-related changes should also be validated under the site’s functional-safety management process. Personally, I would not treat the BMXSAI0410 as a simple plug-in replacement; the channel count, architecture, configuration, and safety validation must all be reviewed.
Product Warranty — 140SAI94000S
Warranty coverage depends on supplier, condition, testing status, and purchase agreement. Because this is a discontinued safety module, procurement records should include the exact part number, hardware condition, test documentation, and replacement strategy. The Schneider 140SAI94000S remains relevant as a lifecycle spare for existing Quantum safety systems, with Schneider indicating standard service through December 31, 2029.
