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Siemens 6ES7521-1BH10-0AA0 — Digital Input Modules

Siemens 6ES7521-1BH10-0AA0 DI Module, 16DI, 25mm

MPN6ES7521-1BH10-0AA0
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Siemens SIMATIC S7-1500 digital input module, 16 DI, 24 V DC, 25 mm width, 40-pole push-in front connectors, 6ES7521-1BH10-0AA0.

$151.13Ref. price · indicative, final on quote
Siemens 6ES7521-1BH10-0AA0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

6ES7521-1BH10-0AA0 — Inputs
ParameterValue
Number of digital inputs16
2-wire sensor supportYes
6ES7521-1BH10-0AA0 — Electrical
ParameterValue
Rated value (DC)24 V
Input voltage at signal "1"+11 to +30V
Input voltage at signal "0"-30 to +5 V
Permissible range, lower limit (DC)19.2 V
Permissible range, upper limit (DC)28.8 V
Input current at signal "1" (typ.)2.7 mA
Power loss (typ.)1.8 W
Permissible quiescent current, 2-wire sensor, max.1.5 mA
Cable length, unshielded, max.600 m
Cable length, shielded, max.1 000 m
6ES7521-1BH10-0AA0 — Timing
ParameterValue
Input delay 0 to 1, min.3 ms
Input delay 1 to 0, min.3 ms
Input delay 0 to 1, max.4 ms
Input delay 1 to 0, max.4 ms
Input delay, parameterizable valuesNo
6ES7521-1BH10-0AA0 — Environmental
ParameterValue
Max. ambient temperature, horizontal installation60 °C
6ES7521-1BH10-0AA0 — Diagnostics & Isolation
ParameterValue
Diagnostics functionNo
Short-circuit (NAMUR sensor)No
Diagnostic alarmNo
Hardware interrupt supportNo
Isolation between channelsNo
Isolation between channels and backplane busYes
Isolation test voltage707 V DC (type test)
Channels per isolated group16
6ES7521-1BH10-0AA0 — Mechanical
ParameterValue
Depth129 mm
Height147 mm
Width25 mm

Product details

Digital input slice for the S7-1500 backplane

The Siemens 6ES7521-1BH10-0AA0 is a 16-channel digital input module for the S7-1500 system, supplied with 40-pole push-in front connectors. It accepts 24 V DC inputs with signal '1' threshold +11 to +30 V and draws roughly 2.7 mA per channel at '1'. The module is sink/source (P-reading) and supports 2-wire sensors.

Dimensions 25 mm x 147 mm x 129 mm, includes 40-pole connectors. Input delay 3-4 ms; cable runs 600 m unshielded, 1 000 m shielded. Power draw is 1.8 W typical. Module isolation tested at 707 V DC. No diagnostic alarm, wire-break, or short-circuit detection — this is a basic 16DI slice. Firmware V1.0.0 is field-updatable.

Lifecycle and supply

This module is listed as current production. No obsolescence notice. Firmware updates are possible via the module's update mechanism. Standard lead times apply through our distribution channel; quote to order for BOM filling.

MPN
6ES7521-1BH10-0AA0