The Omron G9SX-EX401-RT, also cataloged as the G9SX-EX401-RT Flexible Safety Unit, operates as a dedicated hardware component for safety output expansion within G9SX safety controller systems.

Part Number Code Interpretation

• G9SX: Base series designation for flexible safety units

• EX: Expansion unit functionality

• 4: 4 instantaneous safety outputs

• 0: No OFF-delayed safety outputs

• 1: 1 auxiliary output

• No indicator: No OFF-delay time setting

• RT: Screw terminal block structure

Physical & Electrical Specifications

Deterministic Network & Backplane Integration

The G9SX expansion architecture provides logical linkage signals directly via the dedicated side connector interface to ensure synchronized safety shutdown commands. Internal backplane communication velocity ensures response time limits stay strictly within 10 ms from ON to OFF state activation. Signal processing circuits maintain isolation between channel logic and field output relay drive circuits, ensuring deterministic safety operation without software overhead or firmware flash version dependencies.

Package & Shipping Contents

• 1 x Omron G9SX-EX401-RT Flexible Safety Expansion Unit

• 1 x Removable Screw Terminal Block Set (Pre-installed)

• 1 x Instruction Manual / Instruction Sheet

Mounting & Wiring Procedures

• Install the unit on a standard 35-mm DIN rail inside an IP54 or higher rated control enclosure.

• Ensure clear spacing of at least 50 mm above and below the housing for adequate thermal heat convection.

• Wire input and output lines using stranded copper conductors rated for at least 60/75 deg C.

• Tighten terminal screws to a torque spec of 0.5 to 0.6 N.m to prevent terminal strip thermal damage.

• Separate safety output wiring from heavy noise-generating AC power lines and inverter motor leads.

Hardware Operational Inquiries

• What is the primary role of the G9SX-EX401-RT expansion module?

  It provides four instantaneous safety relay outputs and one auxiliary output to increase switching capacity of a G9SX master unit.

• Does the G9SX-EX401-RT require a separate power feed?

  Yes, the unit requires a regulated 24 VDC supply connected across its dedicated power input terminals for internal coil drive.

• What terminal style is supplied on the -RT suffix version?

  The -RT suffix indicates the module is equipped with conventional removable screw terminal blocks for field conductor termination.

• Can this expansion unit operate standalone without a master unit?

  No, it functions as an expansion block and must be linked to a compatible G9SX base safety controller via the expansion connector.

• What is the maximum switching voltage handled by the output contacts?

  The output contacts are rated for a maximum switching capacity of 250 VAC or 125 VDC under resistive load conditions.

• How fast does the safety output drop out upon a stop signal?

  The unit features an ON-to-OFF response time of 10 ms maximum to guarantee rapid breaking of downstream safety circuits.

• What is the recommended mounting orientation for this safety unit?

  Mount the device vertically on a standard 35-mm DIN rail to optimize convective heat flow through the ventilation slots.

• Is there an OFF-delay timer available on this specific model?

  No, the G9SX-EX401-RT model provides immediate output de-energization without any configurable OFF-delay timing functionality.