AX5801-1 Beckhoff
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The Beckhoff AX5801-1 is part of the AX Digital Servo Drives series and features two monitoring channels and two positively driven relay contacts, each with an operating voltage of 24 VDC. It supports safe stop functions STO and SS1, has a safety category of 4, and achieves performance level e. The device has a feedback contact rated at 24 VDC and a maximum feedback current of 0.35 Amps.
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Product Description:
The AX5801-1 safety extension module is produced by Beckhoff for the AX Digital Servo Drives series. It mounts beside a drive and opens the power stage when a hazardous condition is detected. By housing its own relays and status feedback, the unit integrates safe torque off and controlled stop functions into servo axes used in packaging, material handling, and general machine building. This placement keeps the safety hardware close to the axis it monitors, which helps keep the stop path short and direct.
During operation, the module draws only 50 mA from the control supply, a low load that simplifies power budget calculations when many axes share one source. Safety logic is evaluated by 2 independent monitoring channels, and mismatches between them force an immediate shutdown. The architecture attains PL e and is verified for Category 4 circuits, so a single component fault cannot disable the protective function. When a motion stop is requested, the module executes the dual-stage safe-stop sequence STO, SS1, matching Stop Categories 0 and 1 used for machinery drives. Potential-free series feedback contacts return the stop status to a higher-level controller, allowing the PLC to confirm that torque-free conditions exist before restarting the axis.
The plug-in terminal strip uses a conductor pitch of 10 mm, giving ample spacing for shielded safety wiring and helping keep adjacent connections separated. Each feedback line can carry up to 0.35 A without exceeding contact ratings, a value suitable for most control relay coils. The relay contacts are Positively Driven, meaning welded contacts are detected because the normally open and normally closed paths cannot change state independently. Two internal relays are energized by a coil rated at 24 VDC, so the module can be supplied by the same field power used for sensors. Because the feedback path is relay-based, the controller receives a direct hardware status signal rather than a software-only indication.
Frequently Asked Questions about AX5801-1:
Q: How many monitoring channels are integrated in the AX5801-1?
A: The AX5801-1 features two monitoring channels to support safety applications.
Q: Which safe stop functions are available on the AX5801-1?
A: The AX5801-1 provides safe stop functions including STO and SS1.
Q: What type of feedback contact is used on the AX5801-1?
A: Feedback contacts on the AX5801-1 are potential-free and arranged in series for enhanced isolation.
Q: What are the characteristics of the relay contacts in the AX5801-1?
A: Relays on the AX5801-1 are positively driven and rated for an operating voltage of 24 VDC.
Q: What performance level and safety category does the AX5801-1 meet?
A: This model complies with performance level PL e and safety category 4 standards, making it suitable for high safety applications.
