Skip to main content
Log in
Siemens 6ES7221-1BH32-0XB0 — Digital Input Modules

Siemens 6ES7221-1BH32-0XB0 16-DI Digital Input Module, -40..70°C

MPN6ES7221-1BH32-0XB0
Active

Siemens SIMATIC S7-1200 SM 1221, digital input module 6ES7221-1BH32-0XB0, 16 digital inputs, 24 V DC, 45 mm width, 100 mm height, -40 to 70 °C, with diagnostic alarm, parameterizable, IP20, certifications: cULus, CE, FM, KC, Marine, CSA.

$132.08 – $345.06Ref. price · indicative, final on quote
Siemens 6ES7221-1BH32-0XB0 datasheet (PDF)
Sourced new & surplus through independent channelsAuthenticity-screened · ESD-safe packingListing updated Aug 2026

Specifications

6ES7221-1BH32-0XB0 — Inputs
ParameterValue
Number of digital inputs16
Max. inputs, up to 40 °C16
6ES7221-1BH32-0XB0 — Electrical
ParameterValue
Rated value (DC)24 V
Input voltage at signal "1"15 V DC at 2.5 mA
Input voltage at signal "0"5 V DC at 1 mA
Permissible range, lower limit (DC)20.4 V
Permissible range, upper limit (DC)28.8 V
Input current at signal "1" (typ.)4 mA
Input current at signal "0", max. (permissible quiescent current)1 mA
Power loss (typ.)2.5 W
Current consumption from backplane bus (5 V DC), max.130 mA
Cable length, unshielded, max.300 m
Cable length, shielded, max.500 m
6ES7221-1BH32-0XB0 — Timing
ParameterValue
Input delay, parameterizable valuesYes
6ES7221-1BH32-0XB0 — Diagnostics & Isolation
ParameterValue
Diagnostic alarmYes
Channels per isolated group4
6ES7221-1BH32-0XB0 — Mechanical
ParameterValue
Depth75 mm
Height100 mm
Width45 mm

Product details

Product introduction – SM 1221 16-point digital input module

The 6ES7221-1BH32-0XB0: 16-channel digital input module accepting 24 V DC sink or source signals. It operates from -40 to 70 °C, carries FM, UL, CE, KC, and Marine approvals, and is parameterizable.

Input thresholds and sensor compatibility

Inputs are grouped in four isolated groups, allowing mixed-supply wiring within the same module as long as each group's common is referenced to the same potential.

Certifications and compliance

This module carries cULus, CE, FM, KC, Marine, and CSA approvals, covering North American, European, Korean, and maritime installations. For public tenders or classified-area use (FM), the nameplate markings meet the required safety standards.

Frequently asked questions

Can this module be parameterized for input filter settings?

Yes, the module is parameterizable, which means you can configure input filter delays in the S7-1200 hardware configuration for high-speed sensor chains.

Does the module carry FM approval for hazardous locations?

Yes, FM approval is listed, making it suitable for Class I Division 2 areas in steam cycle plants, provided the installation follows the control drawing.

Will this module directly replace a failed 6ES7221-1BH32-0XB0 in an S7-1200 rack without firmware changes?

Yes, it is the same order code; a like-for-like swap requires no firmware update. Simply power down, replace the module, and power up—the CPU retains the configuration.

What certification markings are on the nameplate?

The module nameplate carries cULus, CE, FM, KC, Marine (with RCM), and CSA approvals

What are the exact voltage thresholds for logic 0 and logic 1?

Logic 0 is defined at 5 V DC at 1 mA; logic 1 is identified at 15 V DC at a minimum of 2.5 mA (typical 4 mA). Ensure your sensor output reaches at least 15 V under load to guarantee a reliable high input.

MPN
6ES7221-1BH32-0XB0