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Highlights at a glance
6ES7421-7BH01-0AB0 SM421 isolated digital input module specially designed for SIMATIC S7-400 PLC rack system.
Equipped with 16 channels potential isolated digital input to effectively prevent signal interference and crosstalk.
Rated 24V DC working voltage, with 0.05ms input delay, built in alarm and diagnosis function.
Hot swappable modular design, supports online replacement without cutting off the whole cabinet power supply.
Transmit field sensor signals to S7-400 CPU stably via rack backplane bus communication.
Industrial grade anti-interference performance, adapts to complex and harsh on-site automation working conditions.
Perfectly compatible with S7-400 series CPU, power supply and interface modules to build complete DCS automation system.
Brand new original industrial spare part with full factory inspection, ideal for project transformation and equipment daily maintenance.
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About this supplier
1. Company OverviewChengdu Yakaifeng Electronic Technology Co., Ltd. is a professional industrial automation parts supplier. We focus on PLC modules, drives, HMIs, servo systems and supporting accessories for mainstream global brands. With large inventory, strict quality control, fast delivery and professional technical support, we serve worldwide clients with reliable products and trusted one-stop service.2. Competitive AdvantagesMass in-stock inventory ensures fast delivery, no production delay100% full functional testing before shipment for stable qualityFlexible original & high-quality replacement options for all budgetsProfessional tech team offers free model matching and technical consultationStable supply chain to support small orders and bulk wholesaleCost-effective price with perfect after-sale guarantee3. Factory ProfileStandard dust-proof constant temperature warehouse for standardized storageIndependent professional testing workshop for strict product inspectionComplete standardized quality management and operation processExperienced team offers fast pre-sales reply and remote debugging serviceSupport on-site installation and commissioning technical guidance4. Packaging & ShippingProfessional anti-static, shockproof industrial packing for all modulesThick carton or wooden case to eliminate transit damageMultiple shipping methods: DHL, FedEx, UPS, air & sea freightStandard export package for smooth global customs clearanceFull tracking service, real-time shipping progress update5. Service PromiseAll items come with long quality warranty24/7 efficient online customer responseQualified quality problem supported return & exchangeAccurate parameter check and model selection guidanceAim for long-term win-win cooperation with all global partners
