6ES7 521-1BL00-0AA0 SIEMENS DIGITAL INPUT MODULE
Description
The module 6ES7 521-1BL00-0AA0 belongs to the SIMATIC S7-1500 family, module series SM 521.It is a digital input (DI) module, model designation DI 32×24 V DC HF — providing 32 digital input channels.The
32 inputs are arranged as 2 groups of 16 channels each.It accepts 24 V DC input voltage, with permissible supply range roughly 19.2 V to 28.8 V DC.Power for the module is drawn from the PLC backplane
bus; typical backplane-bus power consumption is around 1.1 W.The module supports standard I/O-module mounting (DIN-rail plus front connector), but front connector (screw-terminal or
push-in) must be ordered separately — not included.Functional features: It supports digital input mode, counter mode (up to 2 inputs can be used as counters), and diagnostics
/ I&M data (I&M0 to I&M3).In summary: this module allows a SIMATIC S7-1500 PLC to read up to 32 discrete 24 V DC input signals (e.g. from
sensors, switches, contact inputs), with grouping, isolation, diagnostics, and optional counter inputs — in a compact I/O module form factor.
Frequently Asked Questions About 6ES7 521-1BL00-0AA0
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Q: What type of module is 6ES7 521-1BL00-0AA0?
A: It is a digital input module for the SIMATIC S7-1500 system — DI 32×24 V DC HF.
Q: What input voltage does it accept?
A: Nominal 24 V DC; permissible supply range 19.2–28.8 V DC.
Q: How many inputs does it provide?
A: 32 digital inputs, arranged as 2 groups of 16.
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