{"product_id":"siemens-simatic-s7-1200-digital-input-modules","title":"SIEMENS - SIMATIC S7-1200 - Digital Input Modules","description":"\u003cp class=\"PDq2pG_selectionAnchorContainer\"\u003eThe Siemens SIMATIC S7-1200 \u003cstrong\u003eSM 1221 Digital Input Modules\u003c\/strong\u003e expand compatible S7-1200 controllers with additional 24 V DC digital input points for monitoring industrial sensors, switches, auxiliary contacts, push buttons and other discrete field signals.\u003cspan class=\"PDq2pG_selectionAnchor\"\u003e\u003c\/span\u003e\u003c\/p\u003e\n\u003cp\u003eThe modules are available with \u003cstrong\u003e8 or 16 sink\/source inputs\u003c\/strong\u003e. Siemens classifies the inputs as IEC Type 1 sink-compatible and specifies a nominal input rating of \u003cstrong\u003e24 V DC at 4 mA\u003c\/strong\u003e, selectable input filtering, galvanic isolation between field and logic circuits, and grouped input commons.\u003c\/p\u003e\n\u003cp\u003eCompatible with \u003cstrong\u003eSiemens TIA Portal\u003c\/strong\u003e, SM1221 modules simplify engineering, commissioning, diagnostics, and maintenance while maintaining Siemens' renowned industrial reliability.\u003c\/p\u003e\n\u003cp\u003eSelect the appropriate module based on the required number of digital input channels.\u003c\/p\u003e","brand":"SIEMENS","offers":[{"title":"SM 1221 - 8 Digital Inputs - Sink\/Source - 24V DC - 6ES7221-1BF32-0XB0","offer_id":49485864992995,"sku":"ID 10100","price":460.98,"currency_code":"NZD","in_stock":true},{"title":"SM 1221 - 16 Digital Inputs - Sink\/Source - 24V DC - 6ES7221-1BH32-0XB0","offer_id":49485865025763,"sku":"ID 10101","price":745.0,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0751\/5956\/8611\/files\/Screenshot_2026-08-02_at_2.18.32_PM.png?v=1785637134","url":"https:\/\/www.electrotk.com\/products\/siemens-simatic-s7-1200-digital-input-modules","provider":"Electrotk","version":"1.0","type":"link"}