Description

The AS-S911-801 is a safety relay module designed as a core component in Schneider Electric’s Modicon safety automation systems. As part of the company’s industrial safety portfolio, it monitors emergency stop circuits, safety gates, and light curtains, converting their discrete signals into reliable shutdown commands for machinery and control systems.

AS-S911-801

Its primary role is to enforce safety functions up to SIL 3 (Safety Integrity Level) and PLe (Performance Level e), ensuring that hazardous machinery stops quickly and safely when dangerous conditions are detected. For safety engineers and plant managers, the AS-S911-801 delivers critical value through its self-monitoring capabilities and redundant design, eliminating blind spots in safety circuits that could lead to undetected faults. Whether integrated into new machinery or retrofitted into existing systems, this module integrates seamlessly with standard control architectures, enhancing safety without sacrificing operational efficiency.

AS-S911-801

Main features and advantages:

The AS-S911-801 distinguishes itself in industrial safety components with features engineered for fail-safety and diagnostic clarity. Functionally, it offers dual-channel monitoring of emergency stop circuits, ensuring that a single wiring fault won’t prevent the module from detecting a genuine emergency stop request—critical in applications like chemical processing where a delayed shutdown could lead to spills or explosions. Its response time of less than 10ms ensures that even high-speed machinery can halt before injuries occur, while built-in diagnostics continuously check for common issues like short circuits or broken wires, alerting maintenance teams to potential problems before they compromise safety.

Hardware design prioritizes ruggedness and compliance. The compact enclosure withstands operating temperatures from -20°C to 70°C, making it suitable for both climate-controlled control cabinets and unconditioned industrial spaces with extreme temperature swings. A key advantage is its immunity to electromagnetic interference (EMI), ensuring reliable operation near motors, welders, or other high-noise equipment that could cause false triggers in less robust safety modules.

Compatibility is a strong suit, with seamless integration into Schneider’s Modicon safety systems and third-party machinery. It works with standard emergency stop buttons, safety interlocks, and light curtains, while its relay outputs interface easily with motor starters, contactors, and PLCs like the AS-P890-000R. This versatility allows the AS-S911-801 to fit into diverse safety architectures, from simple single-machine setups to complex, interconnected systems.

AS-S911-801

Technical specifications:

AS-S911-801

Application areas:

In industrial control systems where safety and reliability are non-negotiable, emergency stop modules serve as the last line of defense against catastrophic accidents. From automated assembly lines with robotic arms to high-speed packaging machinery, these components must instantly halt operations when human operators face danger, while ensuring controlled shutdowns that prevent equipment damage. The AS-S911-801 excels in these critical roles, functioning as a safety relay module that monitors emergency stop circuits and triggers immediate, fail-safe responses—even in environments where electrical noise or wiring faults could compromise less robust systems.

Consider a automotive stamping plant, where large presses exert tons of force to shape metal parts. A single misstep by a worker could have devastating consequences, making reliable emergency stops a moral and regulatory imperative. Here, the AS-S911-801 continuously monitors e-stop buttons positioned around the machinery, instantly cutting power to the press when activated and verifying the circuit integrity during normal operation to prevent false safety drops. In a food processing facility with conveyors and mixers, it ensures that emergency stops triggered by jammed equipment or worker proximity don’t just halt motion but also disable associated systems like ingredient dispensers, preventing secondary hazards. This module is indispensable in industrial safety, providing the fail-safe reliability needed to protect workers and equipment.

AS-S911-801

Related products:

AS-S911-802 – Variant with additional auxiliary outputs, ideal for systems needing separate shutdown signals for the AS-S911-801.

AS-S908-120RP – Power distribution module whose outputs are often controlled by the AS-S911-801 during emergency stops.

XPSAC3721 – Safety controller that coordinates multiple AS-S911-801 modules in large-scale safety networks.

ZBE01 – Extension module that adds 2 more safety inputs to the AS-S911-801 for complex safety circuits.

VW3A3401 – Test tool designed to verify the AS-S911-801’s functionality during safety audits.

AS-B814-016 – Digital input module that monitors the AS-S911-801’s status for PLC logging and reporting.

XPSAK3510 – Safety relay with built-in Ethernet, working alongside the AS-S911-801 in networked safety systems.

ZB4BS542 – Emergency stop button with contact block compatible with the AS-S911-801’s input circuits.

AS-S911-801

Installation and maintenance:

Before installing the AS-S911-801, verify that all safety input wiring uses twisted-pair cables with a minimum cross-section of 0.5mm² to minimize EMI interference. Ensure the module is mounted in a location with at least 15mm clearance from other components to facilitate cooling, especially in enclosures with high ambient temperatures. For proper safety redundancy, connect emergency stop buttons in a series-parallel configuration that allows the AS-S911-801 to detect both open and short circuits. Confirm that output wiring to contactors or motor starters includes appropriate fuses (5A maximum) to protect the module’s relay contacts during high-current shutdowns.

For maintenance, test the AS-S911-801’s emergency stop functionality monthly by activating each connected e-stop button and verifying that all controlled machinery halts immediately. Check LED status indicators weekly to ensure no fault codes are present—flashing red lights indicate issues like input wiring faults that require immediate attention. During annual safety audits, use a calibrated multimeter to verify input voltage thresholds and output contact resistance, ensuring they remain within factory specifications. Never bypass or disable any of the AS-S911-801’s safety features, even temporarily, as this compromises the entire safety circuit.

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