Exact product identification
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Siemens SIMATIC S7-1200 SM 1221 16 DI 24 V DC 6ES7221-1BH32-0XB0
6ES7221-1BH32-0XB0
SIMATIC S7-1200 SM 1221 digital input signal module with 16 sink/source inputs for 24 V DC field signals and configurable input delay in groups of four channels.
- Availability
- In Stock
- Condition
- New Original
- SKU
- 6ES7221-1BH32-0XB0
- Lifecycle
- Active
12 months warranty
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Technical specifications
Verified Siemens technical and ordering data for article number 6ES7221-1BH32-0XB0.
- Siemens article number
6ES7221-1BH32-0XB0
- Product type
SM 1221 DI 16x24 V DC
- Product family
SM 1221 digital input modules
- Controller platform
SIMATIC S7-1200 Classic
- Product lifecycle
PM300: Active Product; phase-out effective 2026-11-01
- EAN
6940408101920
- Degree of protection
IP20
- Supply voltage
24 V DC
- Permissible supply range
20.4–28.8 V DC
- Backplane bus current at 5 V DC, maximum
130 mA
- Input current for signal 1, typical
4 mA/channel
- Number of digital inputs
16
- Input circuit type
Sink/source
- Rated input voltage
24 V DC
- Signal 0 threshold
5 V DC at 1 mA
- Signal 1 threshold
15 V DC at 2.5 mA
- Configurable input delay
0.2, 0.4, 0.8, 1.6, 3.2, 6.4 or 12.8 ms; selectable in groups of four
- Required front connector
Yes
- Mounting context
SIMATIC S7-1200 signal-module position on DIN rail
- Field wiring check
Match sink/source sensor wiring and terminal assignment
- Width
45 mm
- Height
100 mm
- Depth
75 mm
- Net weight
190 g
- Operating temperature
-20 to 60 °C
- Storage and transport temperature
-40 to 70 °C
Confirm the complete manufacturer part number and target system requirements before ordering or replacing an installed component.
SIMATIC S7-1200 Classic platform
Platform This SM 1221 is an S7-1200 signal module used to add 16 digital input channels to a compatible S7-1200 station.
Sink/source wiring and front connector
Installation Confirm the field-sensor wiring, terminal assignment, input-delay grouping and required front connector against the Siemens documentation.
Selection and replacement checks
For a replacement, match the complete 6ES7221-1BH32-0XB0 article number and verify channel mapping, terminal wiring and hardware configuration before installation.
Downloads and documentation
Official Siemens documentation for this exact order number and its S7-1200 platform.
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Condition options
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Documentation support
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Product questions
Key checks for Siemens 6ES7221-1BH32-0XB0 before ordering or replacement.
How many inputs does 6ES7221-1BH32-0XB0 provide?
The SM 1221 module provides 16 digital inputs for 24 V DC field signals. Siemens specifies sink/source input capability.
What voltage range is specified for the inputs?
The rated voltage is 24 V DC, with a permissible supply range of 20.4 to 28.8 V DC.
Can the input delay be configured?
Yes. Siemens lists 0.2, 0.4, 0.8, 1.6, 3.2, 6.4 and 12.8 ms settings, selectable in groups of four inputs.
What should be checked when replacing this module?
Match the complete article number and verify the S7-1200 hardware configuration, channel mapping, sink/source sensor wiring, terminal assignment and required front connector.
Request pricing and availability
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