Siemens S7-1500 PLC 6ES7521-1BL00-0AB0 digital input card wiring, diagnostics and Fault finding. Siemens S7-1500 Product guide: https://new.siemens.com/global/en/products/automation/systems/industrial/plc/simatic-s7-1500.html Siemens Industry Mall: https://mall.industry.siemens.com/goos/WelcomePage.aspx?regionUrl=/uk&language=en Website: https://igselectronics.co.uk/ eBay store: https://www.ebay.co.uk/str/igselectronics Linked in: https://www.linkedin.com/in/ingus-sudints-1b2a2517a/

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