The Siemens 6ES7521-1BL00-0AB0 DI 32x24VDC HF digital input module manual provides overview, wiring, parameters, diagnostics, and technical specifications.
The DI 32x24VDC HF digital input module (6ES7521-1BL00-0AB0) is a Siemens product for the SIMATIC S7‑1500 and ET 200MP systems, offering 32 configurable digital inputs and optional counting functions. It supports high‑frequency input processing and can be integrated with STEP 7 TIA Portal.
The equipment manual covers product overview, wiring diagrams, parameter address space, interrupt and diagnostic alarms, technical specifications, and dimensional drawings. It also includes detailed parameter data record structures for both DI and counting modes.
| Product type designation | DI 32x24VDC HF |
|---|---|
| Supply voltage (rated) | 24 V DC |
| Maximum input current | 40 mA |
| Power available from backplane bus | 1.1 W |
| Number of digital inputs | 32 |
| Maximum counting frequency | 6 kHz |
| Maximum shielded cable length | 1000 m |
| Isolation test voltage | 707 V DC |
It provides 32 digital inputs that can be parameterized.
The counting mode supports a maximum frequency of 6 kHz.