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

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

Name: 6ES7521-1BH10-0AA0
Brand: Siemens
SKU: 6ES7521-1BH10-0AA0
Availability: LimitedAvailability
Author: Night-Shift Neil

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

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Siemens 6ES7521-1BH10-0AA0 datasheet (PDF)

StockContact for availability

Lead timeCall for availability wk

MOQ1 pcs

Sourced new & surplus through independent channelsListing updated Jun 2026

Specifications

Inputs

6ES7521-1BH10-0AA0 — Inputs
Parameter	Value
Number of digital inputs	16
2-wire sensor support	Yes

Electrical

6ES7521-1BH10-0AA0 — Electrical
Parameter	Value
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

Timing

6ES7521-1BH10-0AA0 — Timing
Parameter	Value
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 values	No

Environmental

6ES7521-1BH10-0AA0 — Environmental
Parameter	Value
Max. ambient temperature, horizontal installation	60 °C

Diagnostics & Isolation

6ES7521-1BH10-0AA0 — Diagnostics & Isolation
Parameter	Value
Diagnostics function	No
Short-circuit (NAMUR sensor)	No
Diagnostic alarm	No
Hardware interrupt support	No
Isolation between channels	No
Isolation between channels and backplane bus	Yes
Isolation test voltage	707 V DC (type test)
Channels per isolated group	16

Mechanical

6ES7521-1BH10-0AA0 — Mechanical
Parameter	Value
Depth	129 mm
Height	147 mm
Width	25 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.

Physical fit and wiring

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

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

MPN6ES7521-1BH10-0AA0

Active

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

Request quote

Siemens 6ES7521-1BH10-0AA0 datasheet (PDF)

StockContact for availability

Lead timeCall for availability wk

MOQ1 pcs

Sourced new & surplus through independent channelsListing updated Jun 2026

Specifications

Inputs

6ES7521-1BH10-0AA0 — Inputs
Parameter	Value
Number of digital inputs	16
2-wire sensor support	Yes

Electrical

6ES7521-1BH10-0AA0 — Electrical
Parameter	Value
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

Timing

6ES7521-1BH10-0AA0 — Timing
Parameter	Value
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 values	No

Environmental

6ES7521-1BH10-0AA0 — Environmental
Parameter	Value
Max. ambient temperature, horizontal installation	60 °C

Diagnostics & Isolation

6ES7521-1BH10-0AA0 — Diagnostics & Isolation
Parameter	Value
Diagnostics function	No
Short-circuit (NAMUR sensor)	No
Diagnostic alarm	No
Hardware interrupt support	No
Isolation between channels	No
Isolation between channels and backplane bus	Yes
Isolation test voltage	707 V DC (type test)
Channels per isolated group	16

Mechanical

6ES7521-1BH10-0AA0 — Mechanical
Parameter	Value
Depth	129 mm
Height	147 mm
Width	25 mm

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

Specifications

Inputs

Electrical

Timing

Environmental

Diagnostics & Isolation

Mechanical

Product details

Digital input slice for the S7-1500 backplane

Physical fit and wiring

Lifecycle and supply

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

Specifications

Inputs

Electrical

Timing

Environmental

Diagnostics & Isolation

Mechanical

Product details

Digital input slice for the S7-1500 backplane

Physical fit and wiring

Lifecycle and supply

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