Siemens 3RK2400-2CE00-2AA2

The Siemens 3RK2400-2CE00-2AA2 is a specialized I/O module from the AS-Interface (AS-i) product family. Specifically, it is an AS-i SlimLine Compact module designed for use inside control cabinets.

This module is used to bridge standard digital sensors and actuators to an AS-i network, which significantly reduces wiring complexity by using a single two-wire “yellow cable” for both data and power.

1. Key Technical Specifications

The “Compact” series is known for its narrow width, saving valuable DIN rail space.

2. Addressing and Networking

Because this module supports A/B Addressing, you can connect up to 62 modules on a single AS-i segment (instead of the standard 31).

• Addressing Socket: Located on the front of the module. You use a handheld addressing device (like the 3RK1904-2AB02) to set the module’s unique ID (1A–31A or 1B–31B).

• AS-i Profile: This module follows the S-7.A.7 profile, which defines how the bits are mapped in the PLC’s image table.

3. Wiring and Power (Uaux)

The module features two distinct power circuits:

1. AS-i Power: Provided by the yellow cable. This powers the internal electronics and the digital inputs.

2. Uaux (Auxiliary Power): Provided via the black cable (24V DC). This is required to power the outputs. If the outputs aren’t firing but the network is healthy, the auxiliary power is likely missing.

4. LEDs and Diagnostics

The LEDs on the front panel provide instant feedback on the health of the module and the network:

• ASI (Green/Red): * Green: Communication is normal.