Siemens 6ES7492-1ALOO-OAAO Front Connector Terminal

Siemens 6ES7492-1ALOO-OAAO is a 48-pole SIMATIC S7-400 front connector for signal modules with screw contacts, designed to mount to the backplane and mate with compatible front-facing signal modules to form the I/O interface. It provides the field-wiring interface for the S7-400 system, delivering secure, screw-terminal connections across 48 channels to carry I/O signals between the backplane and attached modules, and is intended for industrial control cabinets. This front connector is an official Siemens accessory for the S7-400 series; Siemens catalogs the standard variant as 6ES7492-1AL00-0AA0, while reseller listings occasionally refer to 6ES7492-1ALOO-OAAO—both denote the same 48-pole front connector. In practice it simplifies wiring for DI/DO and other signal modules in automation projects, offering robust, vibration-resistant connections in harsh factory environments.