The Omron G9SX-EX401-RC serves as the primary G9SX-EX401 Flexible Safety Unit utilized to execute output switching expansion across G9SX Series platforms.

Part Number Breakdown

• G9SX: Product series code for Omron modular safety relay components.
• EX: Expansion unit functionality for increasing output contact count via logical side-bus connection.
• 4: Instantaneous safety outputs (4 NO voltage-free relay contacts).
• 0: OFF-delayed safety outputs (0 channels).
• 1: Auxiliary output (1 PNP transistor status output channel).
• No indicator: Standard instantaneous configuration without internal OFF-delay timing circuits.
• RC: Spring-cage terminal block construction featuring cage-clamp connection mechanisms.

Physical & Electrical Performance Data

Backplane Bus Communication Velocity & I/O Density Scaling

Interfacing directly with Advanced Safety Units, this expansion hardware communicates over an integrated lateral bus connector without requiring external copper wiring between control logic terminals. The internal system logic coordinates high-velocity bus switching signals, enabling synchronous relay actuation while scaling system I/O density within compact cabinet layouts. Internal supervisory circuits enforce firmware flash compatibility checks between master and expansion modules during boot cycles, locking safety outputs open if logic handshake cycles detect communication timing errors or voltage irregularities.

Deliverable Package Listing

• 1 x Omron G9SX-EX401-RC Flexible Safety Expansion Unit
• 1 x Pre-fitted Removable Spring-cage Terminal Block Assembly
• 1 x Technical Instruction Sheet

Cabinet Installation & Wiring Rules

Enclosure & Mounting Specifications

• Snap the housing securely onto standard 35-mm DIN rail installed inside an IP54-rated industrial panel.
• Provide at least 50 mm clearance above and below the module housing to allow adequate air circulation and conductor routing space.

Wiring & Connection Practices

• Strip cable ends 8 mm to 9 mm; push solid or ferruled conductors directly into spring-cage clamp openings.
• Depress the orange terminal release lever with a flat-blade screwdriver (0.6 mm x 3.5 mm) when disconnecting flexible stranded wires.
• Run output contact lines separately from variable frequency drive motor cabling and high-voltage power lines to prevent EMI coupling.
• Connect a 24 VDC PELV/SELV power supply unit to maintain galvanic isolation and transient protection across control loops.

Frequently Asked Questions

• What is the maximum response delay when de-energizing safety outputs?

  The unit opens its instantaneous safety contacts within 10 ms maximum after receiving a shut-off command from the main unit.

• Does this expansion module operate independently without a master controller?

  No, the expansion unit requires direct side-connector attachment to a master G9SX Advanced Unit to receive logical control signals.

• What load ratings are supported by the output contacts?

  The relay contacts support a maximum resistive load of 3 A at 250 VAC or 3 A at 30 VDC, with a rated carry current of 3 A.

• How does the spring-cage mechanism protect against conductor detachment?

  Spring-cage terminals maintain constant spring tension on inserted wires, preventing loose connections caused by continuous vibration.

• What is the electrical lifecycle rating under full load conditions?

  The internal relay contacts offer a minimum electrical durability of 100,000 switching operations at rated resistive load.

• What function does the auxiliary output serve?

  The auxiliary PNP transistor output provides a non-safety status signal limited to standard monitoring functions on PLCs or indicators.

• What supply voltage limits must be maintained during operation?

  The internal logic circuitry requires a 24 VDC power source operating within an allowable voltage range of 20.4 VDC to 26.4 VDC.

• Can this expansion module generate delayed safety outputs?

  No, model G9SX-EX401-RC features four instantaneous relay safety outputs and does not contain OFF-delay timing hardware.