SIEMENS 6ES7221-1BF32-0XB0
SIEMENS 6ES7221-1BF32-0XB0
SIEMENS 6ES7221-1BF32-0XB0
SIEMENS 6ES7221-1BF32-0XB0
SIEMENS 6ES7221-1BF32-0XB0
SIEMENS 6ES7221-1BF32-0XB0
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6ES7221-1BF32-0XB0

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Siemens 6ES7221-1BF32-0XB0 is an eight-channel SIMATIC S7-1200 SM 1221 digital input module for 24 VDC sink or source field signals.
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Technical specifications for 6ES7221-1BF32-0XB0

  • Manufacturer:
    Siemens
  • Part Number:
    6ES7221-1BF32-0XB0
  • Product Family:
    Siemens Simatic S7-1200
  • Product Type:
    SIMATIC S7-1200 SM 1221 Digital Input Module
  • Stock:
    1
  • Inputs:
    8
  • Rated Input Voltage:
    24 VDC
  • Input Circuit:
    Sink / source
  • Backplane Current:
    105 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:
    Between digital input channels in groups of 2
  • Protection:
    IP20
  • Weight:
    0.15 kg
  • Estimated shipping dimensions:
    8.8 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 Planning Wiring Review Commissioning Product Applications

Features:

  • Eight-point input expansion: Adds a compact signal group where cabinet width and point count must stay controlled.
  • Sink/source use: Supports the documented 24 VDC field-circuit conventions when commons are wired correctly.
  • Local state indication: Channel LEDs give maintenance a visible first check at the input module.
6ES7221-1BF32-0XB0 reports discrete field states to an S7-1200 controller in an eight-input expansion position.

Its small input bank is useful where the control cabinet needs a defined set of sensor and contact points without consuming a sixteen-input position.

The module acquires field conditions for the CPU; the application program determines their meaning in the machine sequence.

Apter Power can help confirm the Siemens 6ES7221-1BF32-0XB0 SIMATIC S7-1200 SM 1221 Digital Input Module, input wiring and lifecycle timing before quotation.
Siemens 6ES7221-1BF32-0XB0 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.
  • Signal inventory: Record sensor type, normal state and the input tag for every channel.
  • Sink/source fit: The field device and PLC input need a compatible current path.
  • Assigned positions: Each used channel must correspond to the intended hardware tag in the project.
  • Spare scope: Identify whether the front connector remains with the cabinet.
  • Power isolation: Remove field energy before reseating conductors or the connector.
  • Connector seating: A loose field interface can interrupt a valid sensor signal before it reaches the input circuit.
  • Route separation: Keep the input path away from switching-power wiring that can contaminate discrete states.
  • Channel labels: Maintain conductor identity through the module change.
  • Local-to-PLC proof: Compare terminal voltage, channel indication and program tag.
  • Normal-state test: Exercise both active and inactive conditions for every input.
  • Sequence control: Keep motion inhibited until interlocks respond correctly.
  • Alarm context: Capture any module diagnostic separately from the ordinary channel-state indication.
  • Proximity sensors: Brings qualified 24 VDC position signals into the PLC.
  • Limit and selector contacts: Reports machine-state contacts to control logic.
  • Panel status inputs: Collects permissive, alarm and auxiliary contact information.
  • Compact expansion: Adds eight inputs without selecting a larger sixteen-channel module.
Description
6ES7221-1BF32-0XB0 adds eight digital input positions for the sensors and contacts of a supported S7-1200 machine. Those field states become controller data rather than switched power for an actuator.

The eight-point scope of 6ES7221-1BF32-0XB0 suits a smaller group of signals without assigning a sixteen-input article and reworking the hardware map. Matching the full order code matters because input and output signal modules can look similar in the cabinet.

With 6ES7221-1BF32-0XB0, local input indication and a configured PLC tag provide different observations of the same field transition. Maintenance can use that separation to locate a wiring or project-mapping fault without treating every missing machine state as a failed sensor.
Alternative Names
6ES72211BF320XB0 6ES7221 1BF32 0XB0
Technical notes
6ES7221-1BF32-0XB0 divides its eight inputs between X10/1M (a.0–a.3) and X11/2M (a.4–a.7). Each common serves four inputs; it is not a separate return for every pair. A crossed common during connector transfer can misstate an entire four-point bank. Reconcile the conductors with the approved wiring map while field energy is isolated before returning the machine to automatic operation.
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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.
A replacement photoeye provides only a 5 V logic-high signal for a 6ES7221-1BF32-0XB0 input. Can it be wired directly?
No. Siemens specifies a 15 V DC minimum for a logic-1 signal on this 24 V input module. Select an approved 24 V interface or field sensor instead of assuming that a visible 5 V transition will register reliably.
An emergency-stop contact is wired into 6ES7221-1BF32-0XB0. Does that make this standard module a certified safety input?
No. SM 1221 is a standard digital input module; wiring a safety-related contact to it does not create a fail-safe input function. Have the machine safety design use the approved safety architecture and dedicated hardware where required.
An input on 6ES7221-1BF32-0XB0 stays on after an electronic sensor turns off. What separates a field-signal issue from a failed module?
A residual voltage at the module terminal is a possible field-side cause, not proof of a failed input. Measure the off-state terminal voltage and compare it with the Siemens OFF threshold before deciding whether the sensor circuit or module needs service.
A PNP sensor is added to a cabinet using 6ES7221-1BF32-0XB0. Is “sink/source” on the module label alone enough to approve the connection?
No. A PNP sensor sources current, so use the module as a sinking input with M connected to the negative field reference as shown in the Siemens wiring diagram. Do not use the sourcing-input common arrangement for that sensor.
A 6ES7221-1BF32-0XB0 replacement reads a contact correctly during manual test but misses brief production events. What should be compared?
Compare the installed group delay, pulse duration and archived hardware configuration during the actual cycle. A steady manual test does not prove the required event timing.
A sensor lead feeding 6ES7221-1BF32-0XB0 is extended to 350 m without a shield. Can the same cable plan be accepted?
No. Siemens gives 300 m as the maximum unshielded input-cable length for this module. Redesign the route or use a qualified shielded arrangement before commissioning the relocated sensor.