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Siemens 6ES7223-1BL32-0XB0 SM 1223 digital I/O module

Siemens 6ES7223-1BL32-0XB0 SM 1223: 16 24 V DC inputs and 16 sourcing MOSFET outputs for S7-1200 control expansion.

System function and position

Rebuilt from individual evidence

A SIMATIC S7-1200 SM 1223 mixed digital I/O module with 16 24 V DC inputs and 16 24 V DC sourcing MOSFET outputs.

Unknown: interchangeability, stock, and local repair options are not established by the captured technical sources.

The input filter time is selectable at 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, or 12.8 ms in groups of four.

The technical table lists 70 x 100 x 75 mm dimensions and 310 g weight for the 16-input/16-output 24 V DC variant.

A supported use case is an S7-1200 control panel that needs both 24 V DC discrete sensing and transistor switching in one signal module.

Exact reference
6ES7223-1BL32-0XB0
Category
PLC / CPU
Evidence checked
2026-09-11

System role

This section explains what the product does and where it acts in the surrounding system.

Function
Receives 24 V DC field signals on 16 digital inputs and switches 24 V DC loads through 16 sourcing MOSFET outputs.
System position
Sits between field devices and the S7-1200 CPU program in the discrete control chain.
Upstream / inputs
The input side accepts 24 V DC discrete signals on 16 sink/source channels.
Downstream / outputs
The output side sends 24 V DC switching commands through 16 sourcing MOSFET channels to downstream loads.
Limitations
Unknown: safety suitability, load-specific fit, interchangeability, and live commercial availability require separate evidence.

Evidence ledger

Facts, inferences, and unknowns are kept separate.

Facts

  • Siemens lists 6ES7223-1BL32-0XB0 as an SM 1223 digital input/output module for the S7-1200 family.

    Confidence: high

  • The module provides 16 24 V DC sink/source digital inputs and 16 24 V DC sourcing MOSFET outputs.

    Confidence: high

  • The input table specifies a 24 V DC nominal input, 5 V DC maximum for logic zero, 15 V DC minimum for logic one, and two isolation groups.

    Confidence: high

  • The input filter time is selectable at 0.2, 0.4, 0.8, 1.6, 3.2, 6.4, or 12.8 ms in groups of four.

    Confidence: high

  • The sourcing outputs are specified for 20.4 to 28.8 V DC and up to 0.5 A per output, with current-limit protection and 4.5 W module power dissipation.

    Confidence: high

  • The technical table lists 70 x 100 x 75 mm dimensions and 310 g weight for the 16-input/16-output 24 V DC variant.

    Confidence: high

Inferences

  • The module sits between 24 V DC field signals and the S7-1200 CPU program in a discrete control chain.

    Confidence: high

    Rationale: Its documented mixed input/output function and S7-1200 signal-module identity place field-side acquisition and actuation at the CPU boundary.

  • A supported use case is an S7-1200 control panel that needs both 24 V DC discrete sensing and transistor switching in one signal module.

    Confidence: medium

    Rationale: The use-case statement combines the documented S7-1200 family, mixed I/O count, DC signal type, and sourcing output specification without adding a machine-specific application.

Unknowns

  • Unknown: compatibility with a particular CPU, load, replacement part, or cabinet wiring requires the installed configuration and application documentation.

    Confidence: low

    Missing evidence: No installation-specific configuration, load schedule, or replacement cross-reference was captured.

  • Unknown: current stock, price, repair status, warranty, and local service availability are not established by the captured sources.

    Confidence: low

    Missing evidence: The captured primary documentation is technical and ordering documentation, not a live commercial offer or service record.

  • Unknown: safety-rated or emergency-stop suitability is not established.

    Confidence: low

    Missing evidence: No safety certification or safety-application assessment was captured for this exact reference.

System position diagram

A flow from 24 V DC field signals through the SM 1223 digital inputs to the S7-1200 CPU, then through sourcing MOSFET outputs to DC loads.

Reading limit: system position only, not a wiring or safety drawing.

The module acquires discrete input states and sends transistor output signals within an S7-1200 control chain.

Enlarged system diagram

A flow from 24 V DC field signals through the SM 1223 digital inputs to the S7-1200 CPU, then through sourcing MOSFET outputs to DC loads.

The module acquires discrete input states and sends transistor output signals within an S7-1200 control chain.

View Mermaid source
flowchart LR
  F["24 V DC field signals"] -->|"input states"| M["SM 1223: 16 digital inputs"]
  M -->|"controller input data"| C["S7-1200 CPU / control program"]
  C -->|"output commands"| O["16 sourcing MOSFET outputs"]
  O -->|"24 V DC switching"| L["DC loads"]
View diagram labels
Nodes
24 V DC field signals; SM 1223 digital inputs; S7-1200 CPU / control program; Sourcing MOSFET outputs; DC loads
Edges
Input states; Controller input data; Output commands; 24 V DC switching

Next action

A SIMATIC S7-1200 SM 1223 mixed digital I/O module with 16 24 V DC inputs and 16 24 V DC sourcing MOSFET outputs.

Confirm the complete order code and the configured S7-1200 hardware before replacement or wiring work.

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