Siemens 6ES7221-1BH32-0XB0
Siemens 6ES7221-1BH32-0XB0
Siemens 6ES7221-1BH32-0XB0
Siemens 6ES7221-1BH32-0XB0
Siemens 6ES7221-1BH32-0XB0
Siemens 6ES7221-1BH32-0XB0
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6ES7221-1BH32-0XB0

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Siemens 6ES7221-1BH32-0XB0 is a sixteen-channel SIMATIC S7-1200 SM 1221 digital input module for 24 VDC sink or source field signals.
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Technical specifications for 6ES7221-1BH32-0XB0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7221-1BH32-0XB0
  • Product Family:
    Siemens Simatic S7-1200
  • Product Type:
    SIMATIC S7-1200 SM 1221 Digital Input Module
  • Stock:
    1
  • Inputs:
    16
  • Rated Input Voltage:
    24 VDC
  • Input Circuit:
    Sink / source
  • Backplane Current:
    130 mA
  • Input Delay:
    Parameterizable in groups of four
  • Cable Length:
    500 m shielded / 300 m unshielded maximum
  • Diagnostics:
    Input status indication and diagnostic alarm
  • Potential Separation:
    Input channels in groups of 4
  • Protection:
    IP20
  • Weight:
    0.19 kg
  • Estimated shipping dimensions:
    9.0 x 10.9 x 6.0 cm
  • Tariff Code:
    Please confirm the destination before shipping
  • Country of origin:
    Germany
  • Place of shipment:
    Xiamen,Fujian,China
By purchasing this item, you agree to the Terms & Conditions, ApterPower is not an authorized distributor for listed manufacturers or tradenames and therefore the manufacturer's warranty does not apply. All our products come with ApterPower's 1-year warranty.

More Information

Overview Manuals Input Capacity Field Signals Status Layers Product Applications

Features:

  • Dense input expansion: Sixteen field states occupy one S7-1200 signal-module position.
  • Visible point activity: Local channel indication helps separate a wiring event from a PLC tag issue.
  • Diagnostic support: Module alarms add a second service signal beyond ordinary input status.
6ES7221-1BH32-0XB0 serves machines whose controller needs a substantial group of discrete sensor and contact states.

It reports incoming field conditions; it does not switch loads, and it is not a functional-safety input module merely because some connected contacts are used in operating logic.

Siemens lists the exact article active today, with phase-out scheduled for November 2026.

Apter Power can help confirm the Siemens 6ES7221-1BH32-0XB0 SIMATIC S7-1200 SM 1221 Digital Input Module, channel map and lifecycle timing before quotation.
Siemens 6ES7221-1BH32-0XB0 SIMATIC S7-1200 SM 1221 Digital Input Module Manuals,Datasheets,Link
Important Notice: Other accessories, manuals, cables, calibration data, software, etc. are not included with this equipment unless listed in the above stock item description. All prices are shown in USD.
  • One rack position: A full bank of field contacts is represented without assigning two separate eight-point modules.
  • Address block: Sixteen individual PLC tags must stay aligned with their physical terminal positions.
  • Signal mix: Contacts and suitable electronic sensors can share the bank when each field circuit meets the input characteristic.
  • Spare choice: A lower-count module cannot preserve every installed point merely by fitting the rail.
  • Sink/source arrangement: The sensor and input circuit need a matching current path.
  • Supply reference: Sensor power and return must follow the selected wiring scheme; an input terminal is not a sensor-supply terminal.
  • Long runs: Cable routing and shielding become important in a populated cabinet with remote sensors.
  • Conductor identity: The larger connector map benefits from labels that tie each terminal to a field device.
  • Field state: The actual contact or sensor condition is the starting observation.
  • Module indication: The channel LED shows the local electrical interpretation, not the final machine state.
  • Diagnostic alarm: An alarm requires its own interpretation rather than being inferred from the input LEDs.
  • PLC tag: Hardware configuration and program use determine where the field transition appears to the controller.
  • Machine sensor banks: Collects multiple proximity and photoelectric sensor states.
  • Operating permissives: Reports ordinary equipment-ready contacts to the PLC sequence without implying a safety rating.
  • Process auxiliaries: Reports valve, switch and equipment status contacts.
  • I/O consolidation: Groups sixteen inputs in one expansion module where density is useful.
Description
6ES7221-1BH32-0XB0 gathers sixteen sensor and contact states in one S7-1200 signal-module position. It is useful when a machine has a larger field-input bank but the controller still needs each point represented separately in the project.

Choosing 6ES7221-1BH32-0XB0 in place of two smaller input modules changes the physical module count, connector assignment and hardware addresses. The benefit of density is real only when the installed conductor and PLC-tag map is carried across intact.

The input LEDs and diagnostic alarm available on 6ES7221-1BH32-0XB0 give maintenance local evidence alongside the CPU’s view of the sixteen points. Neither display should be treated as proof of the connected machine’s physical condition without tracing the field device.
Alternative Names
6ES72211BH320XB0 6ES7221 1BH32 0XB0
Technical notes
Siemens specifies a maximum 130 mA demand from the 5 V backplane for 6ES7221-1BH32-0XB0. A free signal-module slot does not prove the CPU can power another card, and the field 24 V supply cannot replace backplane capacity. Calculate the complete station budget against the chosen CPU; stop an expansion that exceeds its permitted 5 V supply.
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FAQS

The following is a list of questions commonly asked by our customers. Please contact us if you have a question about our process that is not answered below.
After reconnecting 6ES7221-1BH32-0XB0, all four inputs on connector X12 are dark while the other connectors respond. Is a replacement card the first step?
No. X12 carries the b.0–b.3 input group and its own 3M reference. Trace that reference and the X12 connector seating under the approved isolation procedure before attributing a four-point loss to the card.
A cabinet revision mounts 6ES7221-1BH32-0XB0 vertically at 50 °C with every input in use. Can the previous horizontal-mount approval be carried over?
No. Siemens rates all sixteen simultaneous inputs through 50 °C for horizontal mounting, but only through 40 °C for vertical mounting. Change the mounting or thermal design before approving this cabinet condition.
A supplier offers a 6ES7221-1BH50-0XB0 for a failed 6ES7221-1BH32-0XB0 because both have sixteen inputs. Can the team order it as a direct swap?
No direct-swap assumption is safe. The offered article belongs to the S7-1200 G2 generation; first match the installed CPU platform, module interface and engineering project against Siemens documentation for that exact alternative.
All removable terminal plugs are missing from a damaged 6ES7221-1BH32-0XB0 position. Is a quote for one loose replacement plug enough to schedule rewiring?
No. This sixteen-input module has four separate seven-pin connector positions, X10 through X13. Source the Siemens-listed compatible terminal-block kit and account for every plug before the outage; a single loose plug cannot reconnect the full input bank.
A cabinet holding 6ES7221-1BH32-0XB0 is exposed to coolant during washdown, but the PLC still reads inputs. Does that reading establish a suitable installation?
No. The module is IP20, not washdown protected. Isolate wet equipment and address the cabinet seal and condensation path before returning the circuit to service; a plausible input bit does not establish enclosure protection.
Maintenance wants to pull the terminal connector from 6ES7221-1BH32-0XB0 while the S7-1200 is powered to shorten downtime. Is that an approved changeover?
No. Siemens instructs that the CPU and S7-1200 equipment be disconnected from electrical power before removing the signal-module connector. Schedule a controlled stop and prove power isolation before disturbing the wiring.

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