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Siemens 6ES7221-1BF30-0XB0 — Digital Input Modules

Siemens 6ES7221-1BF30-0XB0 S7-1200 Digital Input Module, 8 D

MPN6ES7221-1BF30-0XB0

Siemens S7-1200 SM 1221, 6ES7221-1BF30-0XB0, 8 digital inputs, 24 V DC, 1.5 W, IP20.

$68.58 – $86.00Ref. price · indicative, final on quote
Siemens 6ES7221-1BF30-0XB0 datasheet (PDF)
Source DocumentedChannel stated on listing & quote
Condition PhotosReal unit photos / video on request
WhatsApp AnswersFast human replies for machine-down parts
Worldwide DispatchDHL/FedEx — transit quoted per order
Independent China distributor & sourcing agent· Listing updated Sep 2026

Specifications

6ES7221-1BF30-0XB0 — Inputs
ParameterValue
Number of digital inputs8
Max. inputs, up to 40 °C8
6ES7221-1BF30-0XB0 — 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.)1.5 W
Current consumption from backplane bus (5 V DC), max.105 mA
Cable length, unshielded, max.300 m
Cable length, shielded, max.500 m
6ES7221-1BF30-0XB0 — Timing
ParameterValue
Input delay, parameterizable valuesYes
6ES7221-1BF30-0XB0 — Environmental
ParameterValue
Max. ambient temperature, horizontal installation55 °C
6ES7221-1BF30-0XB0 — Diagnostics & Isolation
ParameterValue
Diagnostics functionYes
Diagnostic alarmYes
Channels per isolated group2
6ES7221-1BF30-0XB0 — Mechanical
ParameterValue
Depth75 mm
Height100 mm
Width45 mm

Product details

This 6ES7221-1BF30-0XB0 is an 8-point digital input module for the Siemens S7-1200 family. It pulls 1.5 W from the backplane (105 mA at 5 V DC) and accepts 24 V DC field signals, with a logic "1" threshold at 15 V DC and 2.5 mA. IP20 enclosure suits clean, dry control panels.

Mounting dimensions are 100 mm high, 45 mm wide, and 75 mm deep. The module requires a front connector (sold separately) and sits on the S7-1200 rail. Inputs are arranged in groups of two, with a common reference per group. Unshielded cable runs up to 300 m; shielded runs up to 500 m. Diagnostic alarm and status indication are built in. Power loss is 1.5 W typical, so thermal load in a dense cabinet is manageable.

Frequently asked questions

What are the key ratings for this module?

It has 8 digital inputs at 24 V DC, typical power loss of 1.5 W, operating temperature from -40 °C to 70 °C, and IP20 protection.

Does this module support diagnostic alarms?

Yes, it includes a diagnostic alarm function and status indication for each input.

MPN
6ES7221-1BF30-0XB0