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Siemens 6ES7221-1BH32-0XB0 SIMATIC S7-1200 SM 1221 16x24VDC Digital Input PLC I/O Module

% $-242.19
Siemens 6ES7221-1BH32-0XB0 SIMATIC S7-1200 SM 1221 16DI 24VDC - PLC I/O Module
Siemens 6ES7221-1BH32-0XB0 SIMATIC S7-1200 SM 1221 16DI 24VDC - PLC I/O Module

Siemens 6ES7221-1BH32-0XB0 SIMATIC S7-1200 SM 1221 16x24VDC Digital Input PLC I/O Module

Brand: Siemens
Reference No: 6ES7221-1BH32-0XB0
Catalog No: 6ES7221-1BH32-0XB0
Series: SIMATIC S7-1200
Tariff Code (HS): 85389091
Rated Voltage: 24 V
Stock: 239
Delivery time: 1-2 business day(s)
Shipping Origin: Türkiye EXW
$242.19

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  • Description

The Siemens 6ES7221-1BH32-0XB0 is a SIMATIC S7-1200 digital input module (SM 1221) with 16 sink/source inputs rated 24 V DC, expanding a CPU rack with additional discrete inputs. Input delay is parameterizable in groups of four from 0.2 ms to 12.8 ms, and interrupt-capable channels support event-driven program response.

Technical Specifications

SKU 6ES7221-1BH32-0XB0
Brand Siemens
Series SIMATIC S7-1200
Product type designation SM 1221, DI 16x24 V DC
Supply voltage, permissible range (DC) 20.4 - 28.8 V
Number of digital inputs 16, in groups of 4
Input characteristic curve IEC 61131, type 1
Input voltage for signal "0" / "1" 5 V DC at 1 mA / 15 V DC at 2.5 mA
Input current from backplane bus, max. 130 mA
Power loss, typ. 2.5 W
Cable length, shielded / unshielded, max. 500 m / 300 m
IP degree of protection IP20
Ambient temperature, operation -20 to 60 °C
Width / Height / Depth 45 mm / 100 mm / 75 mm
Weight, approx. 210 g

Certifications & Standards

  • CE
  • CSA
  • UL
  • cULus
  • FM
  • RCM
  • KC
  • Marine Approval

Selection Notes

Grouped in fours, the 16 inputs let four independent sensor groups sit on separate ground references without cross-loading, and the parameterizable input delay (0.2 ms to 12.8 ms per group) trades noise immunity against response speed — set it short for fast interrupt inputs and longer for switch or relay contacts prone to bounce. Choose the 16 DI 24V DC module over an 8-input SM 1221 variant when the station needs headroom for future sensor additions without adding another rack slot.

Applications

Expanding S7-1200 CPU input count for discrete sensors, limit switches, and pushbuttons in machine control panels, with interrupt-capable channels for fast event capture.

Technical Details

Short Description
SIMATIC S7-1200 digital input module SM 1221, 16 DI, 24V DC sink/source, IP20.
Rated Voltage (VAC)
24 V
Protection Type
IP20
Catalog No
6ES7221-1BH32-0XB0
Standards
CE mark, CSA approval, UL approval, cULus, FM approval, RCM (formerly C-TICK), KC approval, Marine approval
Delivery Date (Days)
1-2 days
Model Number
6ES7221-1BH32-0XB0
Tariff Code
85389091

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