USED – Siemens 6ES7 221‑1BF32‑0XB0 SM 1221 Digital Input Module | 8× 24 VDC Inputs DIN‑Rail Compatible

Product Description (with Emojis + “Used”)
️ USED – Siemens SIMATIC S7‑1200 SM 1221 (6ES7 221‑1BF32‑0XB0) is a fully tested, pre-owned 8-channel digital input module for industrial automation. Designed for 24 V DC systems and supporting both sink/source input types, this module has been verified to function properly, with only minor cosmetic wear expected. It includes LED diagnostics for input status and alarm signaling , making it ideal for maintenance or backup in PLC setups.

Compact and efficient, it mounts securely on a DIN-rail and consumes around 1.5 W power, with input current from the backplane at approx. 5 V DC, 105 mA
DigiKey
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RS Components
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eBay
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. Operating reliably within –20 °C to +60 °C, with both horizontal and vertical mounting supported. Certified for CE, UL, CSA, FM, cULus, and IP20 protection
RS Components
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za.rs-online.com
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Typical used listings on eBay range from US $56 to $67 (free or low shipping), with new units fetching around US $110+
eBay
eBay
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Key Features (Used Condition)
Used condition, inspected and fully operational

Siemens SM 1221 module (6ES7 221‑1BF32‑0XB0), S7‑1200 series

8 digital inputs, 24 V DC sink/source compatible

Status LEDs for input and diagnostic alarms

⚡ Low power use, approx. 1.5 W consumption; ~105 mA from bus

️ DIN‑rail mountable, compact design (45×100×75 mm, ~170 g)

️ Wide operating temperature: –20 °C to +60 °C; supports vertical/horizontal install

️ Certified: CE, UL, CSA, FM, cULus; IP20 rated for safe enclosure integration

Excellent value: used listings around US $56–67, new around US $110+
eBay
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Amazon
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DigiKey
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eBay
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automation24.com
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e-motionsupply.com
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RS Components
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support.industry.siemens.com
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za.rs-online.com
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support.industry.siemens.com
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DigiKey
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RS Components
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za.rs-online.com
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✅ Summary
Product: Siemens SM 1221 digital input module, 6ES7 221‑1BF32‑0XB0

Condition: Used, tested, with full functional operation

Specification: 8 inputs @ 24 VDC, sink/source, DIN-rail mountable

Typical price: approx. US $56–67 for used vs. US $110+ new

Ideal use: Spare part, PLC maintenance, backup unit for automation systems