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Siemens SIRIUS 3RK3 ASIsafe Basic Central Unit

Siemens SIRIUS 3RK3 ASIsafe Basic Central Unit.

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ManufacturerSiemens

Part number3RK3121-2AC00

Type ASIsafe Basic Central Unit

Series SIRIUS 3RK3

Safety Integrity SIL 3 (IEC 61508)

Performance Level PL E (ISO 13849-1)

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12-month warranty

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ASIsafe Basic central unit Monitors AS-i devices Controls up to 8 safe outputs SIL 3 and PL E rated Configurable via Safety ES software Spring-loaded terminals

Product description

The Siemens SIRIUS 3RK3121-2AC00 is an ASIsafe Basic central unit for the modular 3RK3 safety system. It is designed for monitoring AS-i devices and controlling up to 8 safe outputs on the AS-Interface bus. This unit features 1/2 F-DI, 6 DI, 1 F-RO, and 1 F-DO, operating on 24 V DC. It is configurable using Safety ES software and has a width of 45 mm with spring-loaded terminals.

This safety unit is crucial for implementing safety functions in industrial machinery and automation systems, achieving up to SIL 3 according to IEC 61508 and Performance Level E according to ISO 13849-1. It is ideal for applications requiring reliable protection for personnel.

Stanlo Automation, a veteran-owned surplus distributor, offers the Siemens SIRIUS 3RK3121-2AC00. Ensure the safety of your operations with reliable components from Stanlo Automation.

Technical specifications

Type	ASIsafe Basic Central Unit
Series	SIRIUS 3RK3
Safety Integrity	SIL 3 (IEC 61508)
Performance Level	PL E (ISO 13849-1)
Inputs	1/2 F-DI, 6 DI
Outputs	1 F-RO, 1 F-DO
Voltage	24 V DC
Width	45 mm
Terminals	Spring-loaded

Common applications

Machine safety

Safety interlocks

Emergency stop circuits

Safety monitoring

Industrial automation safety

Compatible systems

Siemens AS-Interface (AS-i) systems Safety ES software Siemens S7 PLCs (via AS-i gateway)

Also known as

Siemens 3RK3 Basic Unit ASIsafe 3RK3121-2AC00 SIRIUS Safety Controller

Replaces / compatible with

This is a central unit for the Siemens SIRIUS 3RK3 modular safety system. It cannot be expanded with additional modules.

Technical note

Expert tip

Ensure the AS-Interface network is correctly terminated and powered before connecting the 3RK3121-2AC00 central unit to avoid communication issues.

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Frequently asked questions

What is the safety rating of the Siemens 3RK3121-2AC00 ASIsafe Basic unit?

The Siemens SIRIUS 3RK3121-2AC00 ASIsafe Basic central unit meets safety integrity level 3 (SIL 3) according to IEC 61508 and Performance Level E (PL E) according to ISO 13849-1.