BOM / RFQ

Siemens 6ES7521-1BL10-0AA0 — Digital Input Modules

Siemens 6ES7521-1BL10-0AA0 S7-1500 DI, 16ch, 24V DC

Name: 6ES7521-1BL10-0AA0
Brand: Siemens
SKU: 6ES7521-1BL10-0AA0
Availability: LimitedAvailability
Author: Compliance Quentin

MPN6ES7521-1BL10-0AA0

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Siemens 6ES7521-1BL10-0AA0 SIMATIC S7-1500 digital input module, 16 channels, 24 V DC, 25 mm width, supplied with push-in front connectors.

$227.33Ref. price · indicative, final on quote

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Siemens 6ES7521-1BL10-0AA0 datasheet (PDF)

Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

6ES7521-1BL10-0AA0 — Inputs
Parameter	Value
Number of digital inputs	32
2-wire sensor support	Yes

6ES7521-1BL10-0AA0 — 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.)	3 W
Permissible quiescent current, 2-wire sensor, max.	1.5 mA
Cable length, unshielded, max.	600 m
Cable length, shielded, max.	1 000 m

6ES7521-1BL10-0AA0 — 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

6ES7521-1BL10-0AA0 — Environmental
Parameter	Value
Max. ambient temperature, horizontal installation	60 °C

6ES7521-1BL10-0AA0 — 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

6ES7521-1BL10-0AA0 — Mechanical
Parameter	Value
Depth	129 mm
Height	147 mm
Width	25 mm

Product details

OEM Integration Brief

The 6ES7521-1BL10-0AA0 is a digital input module for the SIMATIC S7-1500 system, providing 16 channels for 24 V DC sensors. The module ships with 40-pole push-in front connectors already included, saving an order line on the BOM. Rated supply is 24 V DC, with a signal "1" threshold of +11 to +30 V and typical input current of 2.7 mA. Signal "0" spans -30 to +5 V. Switching times are 3 ms to 4 ms in either direction, suitable for most industrial sensor inputs without requiring isochronous mode. Diagnostic alarm and hardware interrupt are not implemented, but the module provides channel-status green LEDs and a RUN/ERROR bi-color LED. I&M data (I&M0 to I&M3) and firmware update capability are available.

Sourced against an RFQ with standard lead times for active Siemens automation components. No alternate or equivalent parts are evidenced for this order code; the listing is the precise module specified for a 16-channel 24 V DI group in an S7-1500 rack.