140ACI03000C

Overview

The Schneider Electric 140ACI03000C is the conformal-coated variant of the 140ACI03000 analogue input module for the Modicon Quantum platform. It delivers eight differential input channels accepting 1–5 V or 4–20 mA signals, with 12-bit resolution and a single-pole low-pass filter (3 dB at 15 Hz, ±20%) that suppresses high-frequency interference before digitisation.

The conformal coating protects the printed circuit against humidity, condensation and airborne contaminants, making the 140ACI03000C better suited to washdown, outdoor and corrosive environments than the standard module. It occupies one Quantum slot, requires nine input words of addressing, draws 240 mA from the backplane and dissipates about 2 W. Channel status is shown by a green bus LED, a red external-fault LED, eight green channel-on LEDs and eight red channel-fault LEDs. Isolation is 1000 V DC channel-to-bus (3000 V DC tested for 60 s) and 30 V DC between channels, with CE, cUL and FM Class 1 Division 2 approvals.

Application & Technical Notes

The 140ACI03000C behaves electrically like the 140ACI03000, so the integration notes are the same: differential inputs reject common-mode noise, accuracy is ±0.05 % of full scale (±0.1 % maximum) with ±0.0025 %/°C drift, and linearity is ±0.04 %. Common-mode rejection exceeds −72 dB at 60 Hz and update time is 5 ms. Broken-wire and undervoltage detection cover the 4–20 mA and 1–5 V ranges respectively.

The key differentiator is environmental resilience. The conformal coat extends service life where the module is exposed to moisture, chemical vapour or dust, which is common in water treatment, food and beverage, and marine applications. Where the environment is benign, the uncoated 140ACI03000 is the more economical choice with identical signal performance.

Maintenance & Diagnostics

Treat the 140ACI03000C as low-maintenance, but leverage its coating rather than assuming it is sealed. Keep the rack within 0–60 °C and 5–95 % non-condensing relative humidity; the coating helps, but condensation should still be avoided. Inspect the channel LEDs during commissioning to confirm wiring and signal range before relying on the loop.

De-energise the rack before module insertion or removal to protect the backplane. Because the coating can hide physical damage, visually inspect the module during periodic shutdowns for cracked housing or evidence of overheating. Store spares between −40 and 85 °C in original packaging, and recalibrate quality-critical loops against a known source at planned intervals.

Sourcing & Procurement

The 140ACI03000C is the conformal-coated version of the 140ACI03000; choose it when the installation faces humidity, washdown or contaminants. Genuine Schneider Electric modules are preferred for new builds and safety-related loops because they retain the original CE, cUL and FM certifications and warranty. Compatible equivalents may be cheaper, but confirm isolation, accuracy and coating specification before substitution.

For obsolete or long-lead items, refurbished genuine units from a trusted industrial supplier are usually safer than unbranded clones. Purchase through authorised distributors where possible, validate the seller, and keep the manufacturer part number and serial records for traceability and warranty claims.

Frequently Asked Questions

Specifications

The Schneider Electric 140ACI03000C is a differential analog input module designed for the Modicon series. It supports eight inputs with a resolution of 12 bits and operates within a linear measuring range of 1 to 5 V and 4 to 20 mA.

Reproduced from the manufacturer's published data. Values marked "Not available" are absent from the source document.

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