{"title":"Digital Input Modules","description":null,"products":[{"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"},{"product_id":"siemens-simatic-s7-1500-et-200mp-sm-521-digital-input-modules","title":"SIEMENS - SIMATIC S7-1500 \/ ET 200MP - SM 521 Digital Input Modules","description":"\u003cp\u003eSiemens SIMATIC SM 521 digital input modules provide digital signal acquisition for SIMATIC S7-1500 and ET 200MP automation systems.\u003c\/p\u003e\n\u003cp\u003eThe SM 521 family provides a range of digital input configurations for connecting switches, proximity sensors, contacts and other field devices to the automation system. Available variants support different channel densities, signal voltages and input characteristics, including 24 V DC, 230 V AC, NAMUR and wide-range UC applications.\u003c\/p\u003e\n\u003cp\u003eDepending on the selected module, functionality ranges from cost-effective Basic (BA) digital input acquisition to High Feature (HF) capabilities such as parameterizable input delays, diagnostics, hardware interrupts and integrated counting functions. Selected variants also support specialized functions such as isochronous operation, pulse stretching and chatter monitoring.\u003c\/p\u003e\n\u003cp\u003eThe modular design allows the appropriate SM 521 variant to be selected according to the required number of inputs, sensor technology, signal voltage, response time and diagnostic requirements.\u003c\/p\u003e","brand":"SIEMENS","offers":[{"title":"SM521 - 16DI 24V DC BA - 6ES7521-1BH10-0AA0","offer_id":49542169428195,"sku":"ID 01030100","price":680.95,"currency_code":"NZD","in_stock":true},{"title":"SM521 - 16DI 24V DC SRC BA - 6ES7521-1BH50-0AA0","offer_id":49542169460963,"sku":"ID 01030101","price":680.98,"currency_code":"NZD","in_stock":true},{"title":"SM521 - 16DI 24V DC AUX - 6ES7521-7BH00-0AB0","offer_id":49542169493731,"sku":"ID 01030102","price":1265.98,"currency_code":"NZD","in_stock":true},{"title":"SM521 - 16DI 24V DC HF - 6ES7521-1BH00-0AB0","offer_id":49542169526499,"sku":"ID 01030103","price":990.99,"currency_code":"NZD","in_stock":true},{"title":"SM521 - 16DI NAMUR HF - 6ES7521-7TH00-0AB0","offer_id":49542169559267,"sku":"ID 01030104","price":1700.98,"currency_code":"NZD","in_stock":true},{"title":"SM521 - 16DI 230V AC BA - 6ES7521-1FH00-0AA0","offer_id":49542217531619,"sku":"ID 01030105","price":950.95,"currency_code":"NZD","in_stock":true},{"title":"SM521 - 16DI 24–125V UC HF - 6ES7521-7EH00-0AB0","offer_id":49542217564387,"sku":"ID 01030106","price":2155.98,"currency_code":"NZD","in_stock":true},{"title":"SM521 - 32DI 24V DC BA - 6ES7521-1BL10-0AA0","offer_id":49542217597155,"sku":"ID 01030107","price":1356.98,"currency_code":"NZD","in_stock":true},{"title":"SM521 - 32DI 24V DC HF - 6ES7521-1BL00-0AB0","offer_id":49542217629923,"sku":"ID 01030108","price":1297.89,"currency_code":"NZD","in_stock":true},{"title":"SM521 - 64DI 24V DC SNK\/SRC BA - 6ES7521-1BP00-0AA0","offer_id":49542217662691,"sku":"ID 01030109","price":1299.89,"currency_code":"NZD","in_stock":true}],"thumbnail_url":"\/\/cdn.shopify.com\/s\/files\/1\/0751\/5956\/8611\/files\/Screenshot_2026-08-16_at_3.47.15_PM.png?v=1786852053"}],"url":"https:\/\/www.electrotk.com\/collections\/digital-input-modules.oembed","provider":"Electrotk","version":"1.0","type":"link"}