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Application Scenarios:
In a Taiyuan heavy machinery assembly line, the 440R‑G23029A is used to monitor a safety light curtain protecting a robotic welding cell. If a worker breaks the light curtain beam, the relay’s dual channels detect the signal loss, instantly de‑energize the safety outputs, and cut power to the welding robot’s servo drives. The manual reset function (via a key‑switch outside the cell) prevents automatic restart, ensuring the operator is clear before production resumes.
Parameter:
| Main Parameters | Value/Description |
|---|---|
| Manufacturer | Rockwell Automation (Allen‑Bradley) |
| Part Number | 440R‑G23029A (often abbreviated from 440R‑G23029) |
| Product Type | Configurable Safety Relay (GSR Series) |
| Safety Standards | ISO 13849‑1: PL e, CAT 4 IEC 62061: SIL 3 UL, CE |
| Supply Voltage | 24V DC (20.4 – 28.8V DC) |
| Safety Inputs | 2 independent channels (S11‑S12, S21‑S22) Supports 2‑wire NC (E‑Stop) or 3‑wire PNP (Sensors) |
| Reset Input | Manual/External Reset (terminals S33‑S34) |
| Safety Outputs | 2 Safety Relay Outputs (13‑14, 23‑24) Forced‑Guided Contacts, Rating: 6A @ 250V AC / 5A @ 30V DC |
| Auxiliary Outputs | Semiconductor Output (OUT1‑OUT2) for feedback Fault Signaling Contacts (31‑32, 41‑42) |
| Response Time | ≤ 20 ms (typical) |
| Mounting | 35 mm DIN Rail |
| Connection | Removable Screw Terminal Block |
| Operating Temp. | ‑20 °C to +55 °C |
| Diagnostics | LEDs for PWR, CH1, CH2, RDY, FLT, OUT |
Technical Principles and Innovative Values:
- Innovation Point 1: Dual‑Channel Monitoring with Cross‑Fault Detection. Standard relays only check if a circuit is open or closed. The 440R‑G23029A actively monitors two independent input channels for synchronization and faults. It can detect dangerous conditions like short circuits between wires or a welded contact on an E‑Stop button. If the two input signals disagree or a fault is found, the relay enters a safe lockout state, preventing the machine from starting.
- Innovation Point 2: Positively Guided (Force‑Guided) Contacts. This is a critical safety mechanism. The relay’s contacts are mechanically linked so that if the normally open (NO) contact welds shut (fails on), the corresponding normally closed (NC) contact cannot close. This “positive guidance” ensures that a fault in the relay itself can be detected (via the NC contact in the monitoring circuit), guaranteeing a fail‑safe design that meets the highest safety categories.
- Innovation Point 3: Field‑Configurable Logic without Re‑wiring. The relay can be configured via DIP switches or internal jumpers to adapt to different safety functions. The same hardware can be set for E‑Stop (manual reset), Safety Gate (auto restart), or Light Curtain (with external device monitoring). This flexibility reduces spare part inventory and engineering time.
