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Technical Specifications
- Product Model: 140A-C-ASA11A
- Manufacturer: Rockwell Automation
- System Platform: Allen-Bradley ArmorBlock 140A I/O for Compact GuardLogix and GuardLogix 5580
- Function: 2-channel safety inputs with automatic start (Category 3/PL d per ISO 13849-1)
- Communication: CIP Safety over EtherNet/IP (no separate safety network needed)
- Environmental Rating: IP67, IP69K; -20°C to +60°C operating temperature
- Wiring: M12 connectors (4-pin for inputs, 8-pin for network/power)
- Diagnostics: Per-channel LED status (Power, Network, Input, Fault)
- Safety Certifications: TÜV Rheinland certified to IEC 61508 SIL 2, ISO 13849-1 PL d, Category 3
- Mounting: DIN rail or direct machine mounting
- Power Supply: 24 VDC via network trunk (no separate power drop required)
Core Performance and Selection Advantages
The 140A-C-ASA11A delivers significant value in modern safety system design by eliminating traditional hardwired safety relays and consolidating safety logic into a programmable architecture. Unlike legacy solutions that require separate safety controllers and complex wiring, this module integrates directly into Rockwell’s Integrated Architecture, enabling safety functions to be configured and monitored within the same Studio 5000 environment as standard control logic. This reduces engineering time by up to 30% during commissioning and simplifies troubleshooting through unified diagnostics.
Performance-wise, the module supports deterministic safety communication at 2 ms update intervals over standard EtherNet/IP, ensuring rapid response to safety events without dedicated cabling. Its automatic start feature—where the safety circuit re-arms automatically after a transient fault clears—is ideal for high-cycle applications like robotic cells or palletizing systems, improving uptime without compromising safety integrity. Compared to discrete relay-based designs, the 140A-C-ASA11A reduces panel footprint by 50% and cuts wiring labor by eliminating terminal blocks and cross-connections.
From a total cost of ownership (TCO) perspective, the elimination of external safety relays, reduced cabinet space, and lower installation labor yield immediate savings. Long-term, the ability to perform remote diagnostics, track safety event history, and validate performance via built-in test pulses reduces unplanned downtime and supports compliance with OSHA and machinery directive requirements.
140A-C-ASA11A Rockwell
System Integration and Scalability
The 140A-C-ASA11A is natively supported in Studio 5000 Logix Designer, Rockwell’s unified engineering platform. Engineers configure safety tags, assign I/O, and validate logic using the same interface as standard control programs, eliminating context switching and reducing training overhead. The software includes pre-certified safety function blocks (e.g., EMERGENCY_STOP, SAFETY_GATE) that accelerate development and ensure compliance with international standards.
For networking, the module uses standard EtherNet/IP with embedded CIP Safety, enabling seamless coexistence of safety and standard traffic on a single cable. This simplifies integration with higher-level systems: safety status data can be exposed via OPC UA or EtherNet/IP implicit messaging to SCADA, MES, or cloud platforms like FactoryTalk Analytics without gateways or protocol converters. Cybersecurity is addressed through CIP Security features (when paired with compatible controllers), including device authentication and secure firmware updates.
Scalability is a key strength. Multiple 140A modules can be daisy-chained along a single armored trunk cable, supporting up to 32 devices per segment. This allows safety I/O to be placed exactly where needed—on robot arms, conveyor junctions, or washdown zones—without running long homerun cables back to a central panel. The system supports both standalone Compact GuardLogix applications and distributed nodes under a GuardLogix 5580 controller, offering flexibility for small machines or large production lines. Redundant network topologies (DLR, linear) are also supported for high-availability applications.
