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140SAI94000S
140SAI94000S
140SAI94000S

Schneider 140SAI94000S 16-Bit Analog Safety Input Module

  • Model: 140SAI94000S
  • Brand: Schneider Electric
  • Series: Modicon Quantum
  • Product Type: Analog Safety Input Module
  • Channels: 8 independent isolated analog inputs
  • Resolution: 16-bit
  • Measuring Range: 0–25 mA; intended safety applications commonly use the 4–20 mA range
  • Input Impedance: 287 Ω
  • Update Time: 15 ms
  • Channel-to-Bus Isolation: 1,500 VAC for 60 s
  • Channel-to-Channel Isolation: 500 VAC for 60 s
  • Safety Certification: TÜV Rheinland SIL2
  • Bus Current: 400 mA
  • Power Dissipation: 3.5 W
  • Lifecycle: Discontinued in some Schneider regions; Schneider identifies BMXSAI0410 as the replacement. Lifecycle dates vary by region.
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Description

Key Technical Specifications

Parameter Specification
Manufacturer Schneider Electric
Part Number 140SAI94000S
Platform Modicon Quantum
Product Type Analog Safety Input Module
Number of Inputs 8
Input Type Current analog input
Resolution 16 bit
Linear Measuring Range 0–25 mA
Typical Safety Signal 4–20 mA
Absolute Maximum Input 35 mA
Input Impedance 287 Ω
Filter Single-pole low-pass, −3 dB at 15 Hz
Absolute Accuracy ±0.3%; ±0.35% of full scale maximum
Linearity Error ±2 µA maximum, 0–60 °C
Update Time 15 ms
Common-Mode Rejection −65 dB @ 60 Hz; −70 dB @ 50 Hz
Channel-to-Bus Isolation 1,500 VAC / 60 s
Channel-to-Channel Isolation 500 VAC / 60 s
Bus Current 400 mA
Power Dissipation 3.5 W
Input Words Required 13
Safety Certification TÜV Rheinland, SIL2
Other Certifications UL, CSA, CSA HazLoc, C-Tick
Operating Temperature 0–60 °C

The published Schneider datasheet confirms the eight 16-bit analog inputs, 0–25 mA linear range, 287 Ω input impedance, 15 ms update time, and the specified isolation characteristics.

 

Product Introduction

The Schneider Electric 140SAI94000S is an 8-channel analog safety input module for the Modicon Quantum automation platform. It is designed to acquire current-based analog signals while providing diagnostic and safety-related processing for Quantum safety architectures.

A key characteristic is that the eight process-side inputs are independent and isolated. Schneider’s Quantum safety documentation describes the input architecture as dual acquisition paths, with diagnostic mechanisms used to monitor the measuring circuits and compare the acquired values.

The module accepts a linear current range of 0–25 mA, with the commonly used safety transmitter range of 4–20 mA falling inside this operating range. It provides 16-bit resolution and a 15 ms update time.

140SAI94000S

140SAI94000S

140SAI94000S

140SAI94000S

Installation & Configuration Guide

Stage 1: Pre-Installation Preparation

⚠️ Safety First: Because this is a safety I/O module, replacement and commissioning should follow the site’s functional-safety procedures, including the applicable proof-test, validation, and change-management requirements.

Before replacement:

  1. Record the complete part number: 140SAI94000S.
  2. Photograph the existing module and field wiring.
  3. Record the Quantum rack and slot.
  4. Identify all eight analog channels.
  5. Document each transmitter/sensor connected to the module.
  6. Record the configured engineering range.
  7. Save the Quantum safety application and configuration.
  8. Record current diagnostic status.
  9. Document any alarm or shutdown limits associated with each channel.

Stage 2: Removing the Existing Module

  1. Place the process in its approved safe maintenance state.
  2. Apply the site’s LOTO and safety procedures.
  3. Isolate the relevant field circuits.
  4. Apply ESD precautions.
  5. Label all eight channels.
  6. Record polarity and common connections.
  7. Disconnect the field wiring.
  8. Remove the module from the Quantum backplane.
  9. Inspect the backplane connector and terminal assembly.
  10. Retain the original module until commissioning is complete.

Stage 3: Installing 140SAI94000S

  1. Verify the replacement marking 140SAI94000S.
  2. Confirm that the module is intended for the existing Quantum safety architecture.
  3. Inspect the field connector.
  4. Insert the module into the correct Quantum slot.
  5. Fully seat and secure the module.
  6. Reconnect each analog channel according to the original wiring.
  7. Confirm transmitter polarity.
  8. Verify shielding and grounding arrangements.
  9. Check each channel for loose or damaged conductors.

Installation Checklist:

  • Exact part number verified
  • Quantum safety architecture confirmed
  • Correct rack/slot
  • Eight channels identified
  • 4–20 mA transmitters verified
  • Polarity checked
  • Shielding checked
  • Module fully seated
  • Field wiring secured

Stage 4: Commissioning & Testing

  1. Restore field instrumentation power.
  2. Check the module’s Active indication.
  3. Check for an external-fault indication.
  4. Verify each channel’s input status.
  5. Measure representative loop current with an appropriate test instrument.
  6. Compare the measured value with the PLC/safety-system value.
  7. Verify the expected engineering-unit scaling.
  8. Check diagnostic status for each channel.
  9. Perform the required safety validation/proof-test procedure.
  10. Verify configured alarm and shutdown behavior.
  11. Record test results before returning the safety function to service.

⚠️ Troubleshooting Note: If a 4–20 mA channel reads incorrectly, first check loop power, transmitter output, polarity, field wiring, 287 Ω input loading, and channel diagnostics. Do not immediately assume that the Quantum module has failed.

 

Frequently Asked Questions

What is the Schneider 140SAI94000S?

It is an 8-channel analog safety input module for Modicon Quantum, providing 16-bit current-input measurement and safety diagnostics. Schneider lists TÜV Rheinland SIL2 certification among its product certifications.

Does it support 4–20 mA signals?

Yes. The specified linear measuring range is 0–25 mA, so standard 4–20 mA instrumentation is within the module’s measurement range.

How many analog channels does it have?

The module has 8 independent analog input channels. Schneider’s safety architecture documentation describes the process-side inputs as independently isolated channels.

What is the resolution?

The analog input resolution is 16 bits.

What is the update time?

The specified update time is 15 ms.

What is the input impedance?

The specified input impedance is 287 Ω. This should be considered when checking the voltage burden imposed on a 4–20 mA loop.

Is each input isolated?

The specification provides 1,500 VAC isolation between the input channels and the bus and 500 VAC isolation between channels for 60 seconds.

Is the 140SAI94000S discontinued?

Yes, depending on the Schneider regional lifecycle record. Schneider USA lists it as discontinued on March 15, 2022, while Schneider Australia currently lists December 31, 2029 as its discontinuation/end-of-service date. Schneider regional lifecycle records therefore should be checked against the purchasing market.

What is the recommended replacement?

Schneider identifies BMXSAI0410, a Modicon X80 safety analog input module with 4 isolated 4–20 mA inputs, as the replacement. Because the BMXSAI0410 has four inputs rather than eight and belongs to the X80/M580 safety platform, migration requires application, rack, addressing, and safety-architecture review rather than treating it as a direct plug-in replacement.

What should I specify when purchasing a 140SAI94000S?

For a legacy spare, specify:

  • Exact part number: 140SAI94000S
  • Condition: Factory Sealed / New Original / New Surplus / Refurbished & Tested
  • Hardware revision, if applicable
  • Complete terminal/connector configuration
  • Nameplate and serial-number photographs
  • Safety diagnostic/LED condition for used units
  • Test documentation for refurbished units

For a safety-system spare, retaining an exact 140SAI94000S can also avoid introducing an unplanned platform migration during an outage.

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