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Siemens 6ES7521-1FH00-0AA0 is the SIMATIC S7-1500 SM 521 DI 16x230 V AC BA ordering configuration.
The documented configuration combines 16 AC inputs, four channel groups, and a 20 ms input delay.
Siemens 6ES7521-1FH00-0AA0 is a SIMATIC S7-1500 SM 521 digital input module with 16 inputs for 230 V AC signals, arranged in four groups of four channels.
The module provides a 20 ms input delay and Type 1 input characteristics according to IEC 61131. It is intended for monitoring compatible AC switching and status signals in industrial control systems.
The front connector must be ordered separately. Confirm the connector, wiring, voltage and project configuration before installation or replacement.





