Wieland SA-OR-S1-4RK-A Safety Relay Output Module for samos Systems

The Wieland SA-OR-S1-4RK-A is a safety relay output module from the samos series of programmable safety controllers. This compact digital I/O module, carrying article number R1.180.0080.0, provides relay outputs for switching safety-related loads. Designed for integration with samos safety controllers, the SA-OR-S1-4RK-A is used for controlling contactors, solenoid valves, safety relays, and other actuators requiring forced-guided contact switching up to PL e/SIL 3. The samos safety system offers scalable safety solutions for machinery requiring reliable monitoring of safety functions in manufacturing and process industries.

Output Configuration and Contact Ratings

The SA-OR-S1-4RK-A provides 6 relay outputs. The configuration includes 2x2 enabling current paths (safety contacts) and 2x2 signaling outputs (auxiliary contacts). The enabling current paths are forced-guided safety contacts designed to switch loads with a maximum allowable output voltage up to 230V. Output current rating is 6A maximum. Minimum allowed output voltage is 5V. The normally open (NO) safety contacts are arranged in groups that de-energize together when the safety circuit opens. The auxiliary signaling outputs are typically used for status indication to a PLC or for diagnostic feedback loops.

Supply Voltage and Power Specifications

Supply voltage: 24V DC (type of supply voltage is direct current). Minimum supply voltage is 19.2V DC; maximum is 30V DC. Short-circuit protection for the outputs is not integrated, requiring external fusing for each output circuit based on the connected load characteristics. Screw terminal connections are provided for secure field wiring, allowing conductors of appropriate gauge for the 6A current rating. The pluggable terminal screws simplify replacement and maintenance by allowing the wiring to remain in place while the module is removed. The module's power consumption is low enough to allow direct powering from the samos system backplane, though external 24V DC supply is required for output power.

Safety Integrity and Performance Level

The SA-OR-S1-4RK-A is suitable for use in safety circuits up to Category 4 (EN ISO 13849-1) and Performance Level e, the highest level defined by the standard. SIL capability is rated at SIL 3 (IEC 61508 / IEC 62061), supporting applications requiring systematic capability and architectural constraints for high-risk machinery. The forced-guided relay contacts provide inherent fault detection, as welded contacts are detectable through the monitoring function of the connected samos controller. Mission time is rated at 20 years, reflecting expected service life under specified operating conditions. Hot functional testing (HFT) meets requirements for redundant safety architectures.

Physical Design and Installation

The SA-OR-S1-4RK-A has a compact width of 22.5mm, enabling high-density mounting in control cabinets. Height is 96.5mm, depth is 121mm, conforming to standard DIN rail mount dimensions for industrial control components. Weight is approximately 0.197 kg. The module snaps onto standard 35 mm DIN rail and is secured by integrated clips. I/O points are not configurable; the fixed output configuration is factory set for safety output functions. Status indication is provided by LED indicators on the front panel, showing power status and output state for each channel.

Integration with samos Safety Controllers

The SA-OR-S1-4RK-A is a digital I/O module designed specifically for use with Wieland's samos programmable safety controllers. The module mounts on the same DIN rail adjacent to the samos CPU module and connects via the internal system bus. Configuration is performed using the samos safety engineering software, where safety logic maps the outputs to specific safety functions monitored by the CPU. The module expands the output capacity of samos systems for larger safety applications requiring multiple contactor outputs. The system supports hot-swapping of modules for maintenance without complete system shutdown.

Applications in Machine Safety

Typical safety applications for the SA-OR-S1-4RK-A include emergency stop output expansion for controlling multiple contactors, safety gate output control for locking mechanisms, drive safety outputs for safe torque off (STO) circuits, and two-hand control system monitoring and output switching. Industries using Wieland samos safety systems include packaging machinery, automotive assembly lines, robotics integration, material handling equipment, and processing machinery where reliable safety shutdown is required.

Conclusion

The Wieland R1.180.0080.0 SA-OR-S1-4RK-A safety relay output module provides 6 relay outputs for samos programmable safety systems. With DC 24V supply, forced-guided contacts, and compact 22.5mm width, it supports safety integrity up to Category 4 / PL e for industrial machine safety applications.