Siemens SIRIUS 3RK3121-1AC00 ASIsafe Basic Central Unit
Siemens SIRIUS 3RK3121-1AC00: ASIsafe Basic unit for modular safety systems.
The Siemens SIRIUS 3RK3121-1AC00 is a central unit for the modular 3RK3 ASIsafe safety system. It provides 1 or 2 safe digital inputs (F-DI), 6 standard digital inputs (DI), 1 safe relay output (F-RO), and 1 safe digital output (F-DO). This unit operates with a 24V DC supply and is designed for monitoring AS-i devices and controlling up to 8 safe outputs on the AS-Interface bus.
Configuration is performed using Safety ES software, allowing for flexible adaptation to specific safety requirements. The unit has a width of 45 mm and uses screw terminals for connections. It meets high safety standards, achieving up to SIL 3 according to IEC 61508 and Performance Level E according to ISO 13849-1. No expansion modules can be connected to this central unit.
Stanlo Automation, a veteran-owned surplus parts distributor, offers the Siemens SIRIUS 3RK3121-1AC00. Secure reliable safety components for your machinery and systems from a trusted supplier.
| Type | Central Unit |
| Series | SIRIUS 3RK3 ASIsafe |
| F-DI | 1/2 |
| DI | 6 |
| F-RO | 1 |
| F-DO | 1 |
| Voltage | 24 V DC |
| AS-Interface | Yes |
| Configuration Software | Safety ES |
| Width | 45 mm |
| Safety Rating | SIL 3 (IEC 61508), PL E (ISO 13849-1) |