Technical Specifications

FAQ

1. What is the main function of the 6AG1226-6RA32-5XB0 module?

The 6AG1226-6RA32-5XB0 is a fail-safe relay output module designed for safety-related applications in SIMATIC S7-1200 automation systems. It provides two relay output channels for switching compatible AC or DC loads according to the control program. The relay contacts allow the module to interface with a range of industrial devices, including contactors, control relays, and other switching equipment within the specified electrical limits. Its PROFIsafe communication capability supports integration into safety-related control architectures. The module is particularly suitable for applications that require reliable output switching, defined fault responses, and compliance with functional safety requirements.

2. What are the electrical requirements for the relay outputs?

The module operates with a 24 V DC supply, with a permissible supply voltage range of 20.4–28.8 V DC. Its relay contacts support output voltages from 5–30 V DC or 5–250 V AC. The rated switching current is 5 A per circuit, with a maximum total current of 10 A across the module. These limits must be evaluated together with the connected load characteristics, switching frequency, and applicable contact ratings. Engineers should also consider inrush current, inductive switching transients, and the need for external circuit protection. The relay outputs do not provide integrated short-circuit protection, so suitable protective devices must be selected for the application.

3. How does the module support functional safety in an S7-1200 system?

The module supports safety-related applications through PROFIsafe communication and compatibility with an appropriately configured fail-safe automation system. Its specified safety capability reaches SIL 3 according to IEC 61508 and Category 4, PL e according to ISO 13849-1, subject to the applicable conditions and system design. To achieve the required safety performance, engineers must configure the compatible fail-safe controller, safety program, communication parameters, and output circuits correctly. The complete safety function must also account for field wiring, connected actuators, diagnostic behavior, and fault response. Appropriate validation and documentation are required before the system is put into service.

4. Can the relay outputs switch both AC and DC loads?

Yes. The relay contacts support both AC and DC switching within their specified voltage and current limits. The permissible output voltage is 5–250 V AC or 5–30 V DC, and the rated current is 5 A per circuit. However, the switching capability depends on the load type. Resistive loads generally allow more frequent switching than inductive loads, which can generate significant electrical transients when switched off. For inductive applications, such as solenoids or contactor coils, suitable suppression components may be necessary. Always check the applicable utilization category, contact ratings, and load requirements before connecting equipment.

5. What is the maximum switching frequency of the module?

For resistive loads, the specified maximum switching frequency is 2 Hz. For inductive loads, the limits depend on the utilization category: 0.1 Hz for DC-13 and 2 Hz for AC-15 under the specified conditions. These restrictions are important because relay contacts experience electrical and mechanical wear during switching. Operating beyond the applicable limits may reduce contact life or affect switching reliability. Applications involving frequent cycling should be evaluated carefully, particularly when switching motors, solenoids, or other inductive devices. If the application requires rapid and continuous switching, an alternative output technology may be more appropriate.

6. What environmental conditions can the module withstand?

The SIPLUS version is designed for an operating temperature range of -25 to +55 °C and features a conformal protective coating on its electronic assemblies. This construction provides additional protection against certain environmental influences encountered in industrial installations. The module has an IP20 protection rating, so it is intended for installation in a suitable control cabinet rather than direct exposure to water or uncontrolled environmental conditions. Engineers should assess humidity, condensation, corrosive contaminants, vibration, and cabinet ventilation before installation. The protective coating does not eliminate the need for proper enclosure design or compliance with the manufacturer’s environmental restrictions.

7. How should a relay output fault or unexpected switching condition be diagnosed?

Begin by checking the module status indicators and the controller’s diagnostic information to identify any reported hardware, configuration, or communication fault. Next, verify the 24 V DC supply, terminal connections, load wiring, and connected equipment. Use appropriate measuring instruments to confirm that the supply voltage and output circuit conditions are within specification. If the relay output does not switch as expected, investigate the safety program, PROFIsafe communication, and any active interlocks or fault responses. Also check for welded or worn relay contacts where the application and inspection procedure permit. Isolate hazardous energy before handling wiring, and complete the required functional tests after corrective work.

8. Can the 6AG1226-6RA32-5XB0 replace a standard digital output module?

It should not be treated as a direct replacement without a compatibility assessment. This model is a fail-safe relay output module with two relay output channels, AC/DC switching capability, and PROFIsafe support. A standard digital output module may use semiconductor outputs, have different voltage and current limits, or lack the safety functions required by the application. Before replacement, confirm compatibility with the installed S7-1200 controller, engineering software, firmware, hardware configuration, and safety program. Verify the relay contact ratings, field wiring, external protection, and load characteristics as well. After installation, perform the necessary commissioning checks and safety validation before returning the equipment to normal operation.