Siemens 6ES7521-1BL00-0AB0: High-Speed 32-Channel Digital Input Module

The 6ES7521-1BL00-0AB0 is a SIMATIC S7-1500 digital input module. It has 32 channels for 24V DC signals. Two inputs can work as fast counters. It offers flexible input delay settings and strong diagnostics.

Quick Setup Guide

• Mount the module on the S7-1500 rack.
• Connect your 24V DC sensor wires to the front connector (sold separately).
• Use TIA Portal (V13 SP1 or newer) for configuration.
• Set input delays from 0.05ms to 20ms as needed.
• Assign two channels for counting up to 6 kHz if required.

Technical Specifications & Data

Product Code: Siemens 6ES7521-1BL00-0AB0 (SIMATIC S7-1500 DI 32x24VDC HF)
Module Type: Digital Input (DI) Module, High Feature (HF).
Channels: 32 isolated inputs, in groups of 16.
Supply Voltage: 24V DC (Safe range: 19.2V to 28.8V).
Input Logic: Signal "1": +11V to +30V. Signal "0": -30V to +5V.
Input Current: Typically 2.5 mA per channel at "1".
High-Speed Counters: 2 channels, 32-bit, up to 6 kHz frequency.
Input Delay: Adjustable (0.05, 0.1, 0.4, 1.6, 3.2, 12.8, 20 ms).
Cable Length: Up to 1000m (shielded) or 600m (unshielded).
Diagnostics: Wire-break, supply voltage monitoring, LED status.
Operating Temperature: -30°C to 60°C (horizontal mount).
Dimensions: 35mm W x 147mm H x 129mm D. Weight: ~260g.
Compatibility: STEP 7 TIA Portal, PROFINET GSD V2.3.

Frequently Asked Questions (FAQ)

What are the main uses for this module?
It's perfect for reading many digital signals, like from push buttons, limit switches, or proximity sensors. You can also use two channels for counting pulses from encoders.

What does "input type 3" mean?
It meets the IEC 61131 Type 3 standard. This means it's designed to reliably read signals from standard 3-wire PNP industrial sensors without false triggers.

Can I connect 2-wire sensors directly?
Yes, you can connect 2-wire sensors. The module allows a maximum quiescent current (leakage) of 1.5 mA for these sensors to work correctly.

How do I handle wire-break detection?
The module can detect a broken wire if the input current drops below 350 µA. You can enable this diagnostic in the configuration software to receive an alarm.

Is there a delay when the input signal changes?
Yes, but you can set it. You can choose a fixed delay from 0.05ms (very fast) up to 20ms (for noisy signals) to filter out contact bounce or interference.

Warranty & Shipping Info

We provide a full 12-month warranty on this module from the date of purchase. We ship globally using reliable express services: FedEx, UPS, and DHL.

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