Digital Module 16DI

Siemens 6ES7221-1BH32-0XB0 is a digital input signal module for the SIMATIC S7-1200 programmable logic controller. It provides 16 digital input channels, allowing flexible expansion of digital sensing capabilities in industrial automation systems.

Key Features

• Type: SM 1221, Digital Input (DI)

• Number of Inputs: 16

• Input Type: 24 V DC, sink/source

• Input Voltage:

  • Rated value: 24 V DC

  • Permissible range: 20.4–28.8 V DC

  • Signal "0": 5 V DC at 1 mA

  • Signal "1": 15 V DC at 2.5 mA

• Input Current:

  • Signal "0": Max. 1 mA (permissible quiescent current)

  • Signal "1": Min. 2.5 mA, typical 4 mA

• Input Characteristic: IEC 61131, Type 1

• Input Grouping: In groups of 4

• Simultaneously Controllable Inputs: All 16 inputs (up to 40°C in all mounting positions; up to 50°C horizontal installation)

• Input Delay: Parameterizable (0.2, 0.4, 0.8, 1.6, 3.2, 6.4, 12.8 ms; selectable in groups of four)

• Cable Length:

  • Shielded: Max. 500 m

  • Unshielded: Max. 300 m

• Power Supply:

  • From backplane bus (5 V DC): Max. 130 mA

  • From load voltage L+ (without load): Max. 4 mA per channel

• Power Loss: Typical 2.5 W

• Diagnostics:

  • Diagnostic alarm: Yes

  • Diagnostics indication LED: For status of inputs and maintenance

  • Status indicator (green): For each digital input

• Galvanic Isolation: Between channels, in groups of 4

• Protection: IP20

• Operating Temperature:

  • All mounting positions: -20°C to +60°C (standard); all 16 inputs available up to 40°C

  • Horizontal installation: Up to 50°C, all 16 inputs available

• Storage Temperature: -40°C to +70°C

• Relative Humidity: Up to 95% at 25°C (non-condensing)

• Dimensions: 45 mm (width) × 100 mm (height) × 75 mm (depth)

• Weight: Approx. 210 g (some sources list 190 g net weight)

• Certifications: CE, CSA, UL, cULus, FM, RCM, marine approval

• Front Connector: Required (not included)

Applications

• Expansion of digital inputs on SIMATIC S7-1200 PLCs

• Automation and process control in industrial environments

• Integration into control panels and machinery