Schneider AS-S911-801 Hot-Swappable I/O Module for Continuous Operation in Critical Infrastructure

The Schneider AS-S911-801 is an 8-channel analog input module designed for the Modicon Quantum programmable logic controller(PLC)platform.It provides high-precision acquisition of standard industrial signals—such as 4–20 mA,0–20 mA,and 0–10 V—from field devices like pressure transmitters,RTDs(via external transmitters),flow meters,and temperature sensors.With per-channel configuration,galvanic isolation,and built-in diagnostics,the AS-S911-801 ensures reliable data capture in demanding environments across water treatment,power generation,oil&gas,and chemical processing.

Application Scenarios

At a municipal wastewater treatment plant in Germany,inconsistent chemical dosing was causing effluent violations.The root cause:aging analog input cards with±1%drift were misreading pH and ORP transmitter signals.After upgrading to the Schneider AS-S911-801,engineers configured each channel individually(e.g.,Channel 1=4–20 mA pH,Channel 2=0–10 V turbidity)and enabled open-wire detection.The module’s 16-bit resolution and±0.1%accuracy stabilized control loops,reducing chemical consumption by 18%.During a subsequent audit,the plant achieved full compliance with EU Directive 91/271/EEC—thanks in part to the reliability of the AS-S911-801.

Parameter

Main Parameters Value/Description

Product Model AS-S911-801

Manufacturer Schneider Electric

Product Category Analog Input Module–Modicon Quantum I/O System

Number of Channels 8 independent channels

Input Types

Current:0–20 mA,4–20 mA(sink mode)

Voltage:0–10 V,±10 V

Resolution|16 bits(65,536 counts)

Accuracy|±0.1%of full scale at 25°C

Isolation|Channel-to-backplane:500 V RMS(galvanic isolation)

Update Time|~10 ms for all 8 channels(configurable scan rate)

Diagnostics|Open-wire detection,overrange/underrange alerts,per-channel LED status

Backplane Communication|Via Modicon Quantum I/O bus(supports redundancy)

Mounting|Plugs into standard Modicon Quantum I/O chassis(e.g.,140CRP81100,140CPS11420)

Power Consumption|~2.5 W(supplied via backplane)

Operating Temperature|0°C to+60°C

Certifications|CE,UL,CSA,ATEX(when installed in compliant enclosures)

Technical Principles and Innovative Values

Innovation Point 1:Per-Channel Signal Flexibility

Unlike fixed-range modules,the AS-S911-801 allows each of its 8 channels to be independently configured via software(Unity Pro or EcoStruxure Control Expert)—enabling mixed signal types(e.g.,4–20 mA on Ch1–4,0–10 V on Ch5–8)in a single module.

Innovation Point 2:Advanced Diagnostics for Predictive Maintenance

The module continuously monitors for broken wires,sensor saturation,and signal out-of-range conditions—reporting faults directly to the PLC logic.This enables condition-based maintenance instead of scheduled downtime.

Innovation Point 3:Seamless Integration with EcoStruxure Architecture

When used in modernized Quantum systems,the AS-S911-801 feeds real-time analog data into EcoStruxure Asset Advisor or AVEVA System Platform,enabling cloud-based analytics and anomaly detection.

Innovation Point 4:Deterministic Performance for Closed-Loop Control

With consistent 10 ms update cycles and low noise design(<0.05%ripple),the module supports high-performance PID loops for pressure,level,and temperature control—critical in continuous processes.

Application Cases and Industry Value

In a Canadian oil sands facility,the AS-S911-801 was deployed to monitor steam trap temperatures and boiler drum levels across 12 skids.Its open-wire detection identified a failing thermocouple before a catastrophic dry-fire event could occur—preventing an estimated$2.3M in equipment damage.

Similarly,at a U.S.pharmaceutical plant using Modicon Quantum for batch reactor control,the AS-S911-801’s precision enabled tighter temperature ramping during API synthesis.Batch cycle time decreased by 9%,increasing annual capacity by 3 batches without new capital expenditure.

Installation,Maintenance,and Full-Cycle Support

Installation involves inserting the AS-S911-801 into a Quantum I/O rack and connecting field wiring to removable terminal blocks(screw or spring-type).No external power is required—it draws from the backplane.

Configuration is performed in Unity Pro or EcoStruxure Control Expert:assign engineering units(e.g.,“0–100°C”),set alarm thresholds,and enable diagnostics.All settings are stored in non-volatile memory.

Maintenance is proactive:the module logs fault events and reports them to the PLC.Failed units support hot swap in redundant systems or can be replaced during planned outages.

Although the Modicon Quantum platform is now in mature lifecycle phase,Schneider continues to support the AS-S911-801 through its Long-Term Availability Program,with spare parts guaranteed until at least 2028.Units are backed by global service centers and firmware archives.