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Siemens 6ES7521-7TH00-0AB0 — PLC Communication Modules

Siemens 6ES7521-7TH00-0AB0 S7-1500 DI Module, 16 Inputs, Cou

MPN6ES7521-7TH00-0AB0

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Siemens SIMATIC S7-1500, 6ES7521-7TH00-0AB0 DI module: 16 digital inputs, 8.2 V DC, integrated 32-bit counters, 35 mm width.

$554.99Ref. price · indicative, final on quote

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Siemens 6ES7521-7TH00-0AB0 datasheet (PDF)

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

Specifications

6ES7521-7TH00-0AB0 — Identification
Parameter	Value
Configurable from STEP 7 TIA Portal version	STEP 7 V17 or higher
Firmware version	V1.0.0
Hardware functional status (FS)	From FS01

6ES7521-7TH00-0AB0 — Communication
Parameter	Value
I&M data support	Yes; I&M0 to I&M3
Diagnostics function	Yes
Isochronous mode	Yes

6ES7521-7TH00-0AB0 — Electrical
Parameter	Value
Rated value (DC)	8.2 V
Permissible range, upper limit (DC)	28.8 V
Permissible range, lower limit (DC)	19.2 V
Current consumption, max.	220 mA
Power loss (typ.)	3.7 W
Reverse polarity protection	Yes
Short-circuit protection	Yes; Per group, electronic
Isolation test voltage	707 V DC (type test)

6ES7521-7TH00-0AB0 — Environmental
Parameter	Value
Operating temperature, horizontal install, min.	-30 °C
Operating temperature, horizontal install, max.	60 °C
Operating temperature, vertical install, max.	40 °C
Operating temperature, vertical install, min.	-30 °C

6ES7521-7TH00-0AB0 — Mechanical
Parameter	Value
Width	35 mm
Height	147 mm
Depth	129 mm

Product details

The 6ES7521-7TH00-0AB0 is a 16-channel digital input module for the SIMATIC S7-1500 system. It reads 8.2 V DC signals and includes module-specific interrupt (MSI) capability for fast event response. Integrated counters handle up to 4 channels at 10 kHz or 2 at 20 kHz with 32-bit width. That saves an extra counter card in the rack.

The module mounts in any S7-1500 rack slot. Its 35 mm width leaves room for extra I/O in a crowded panel. Firmware version V1.0.0 is field-updatable, so a later revision ships if needed. Diagnostic and hardware interrupts are standard; isochronous mode is supported for time-critical loops.