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Siemens 6ES7521-7EH00-0AB0 — Digital Input Modules

Siemens 6ES7521-7EH00-0AB0 DI Module, 125 V

MPN6ES7521-7EH00-0AB0
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Siemens Simatic S7-1500 digital input module 6ES7521-7EH00-0AB0, DI Yes MSI Yes, rated 24/48/125 V AC/DC, depth 129 mm.

$491.61 – $1,181.15Ref. price · indicative, final on quote
Siemens 6ES7521-7EH00-0AB0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

6ES7521-7EH00-0AB0 — Inputs
ParameterValue
Number of digital inputs16
2-wire sensor supportYes
6ES7521-7EH00-0AB0 — Electrical
ParameterValue
Rated value (DC)24 V; 48 V, 125 V
Input voltage at signal "1"+11 ... +146 V
Input voltage at signal "0"-5 ... +5 V
Input current at signal "1" (typ.)3 mA; At 24 V DC
Power loss (typ.)2.2 W; At 24 V DC; 6.0 W at 125 V AC
Permissible quiescent current, 2-wire sensor, max.1.5 mA
Cable length, unshielded, max.600 m
Cable length, shielded, max.1 000 m
6ES7521-7EH00-0AB0 — Timing
ParameterValue
Input delay 0 to 1, min.0.05 ms
Input delay 1 to 0, min.0.05 ms
Input delay 0 to 1, max.20 ms
Input delay 1 to 0, max.20 ms
Input delay, parameterizable valuesNo
6ES7521-7EH00-0AB0 — Environmental
ParameterValue
Max. ambient temperature, horizontal installation60 °C
6ES7521-7EH00-0AB0 — Diagnostics & Isolation
ParameterValue
Diagnostics functionYes
Short-circuit (NAMUR sensor)No
Diagnostic alarmYes
Hardware interrupt supportYes
Isolation between channelsYes
Isolation between channels and backplane busYes
Isolation test voltage2 000 V DC
Channels per isolated group1
6ES7521-7EH00-0AB0 — Mechanical
ParameterValue
Depth129 mm
Height147 mm
Width35 mm
6ES7521-7EH00-0AB0 — Specifications
ParameterValue
Rated value (AC)24 V; 48 V, 125 V (50 - 60 Hz)

Product details

Module overview

The Siemens 6ES7521-7EH00-0AB0 is a digital input module for the S7-1500 system, supporting both source/sink inputs and motion-sensing interface (MSI) inputs. Diagnostic alarm, hardware interrupt, and prioritized startup are included. Firmware version V1.0.0 is field-updatable.

Input voltages and signal thresholds

Rated for 24 V, 48 V, and 125 V in both AC (50-60 Hz) and DC variants. Signal '0' spans -5 to +5 V; signal '1' requires +11 to +146 V. Typical input current at 24 V DC is 3 mA. Wire-break detection triggers below 550 µA.

Marked as current production. Firmware V1.0.0 includes I&M data (I&M0–I&M3). Available to order against RFQ.

Frequently asked questions

What are the rated supply voltages?

The module is rated for 24 V, 48 V, and 125 V AC/DC.

Does this module support diagnostic alarms?

Yes, diagnostic alarm and hardware interrupt are available.

What is the physical width and depth?

Width 35 mm, depth 129 mm, height 147 mm.

MPN
6ES7521-7EH00-0AB0