HOME > Support Support information is available for prospective customers interested in purchasing KOYO products and existing customers using KOYO products. Catalogs for the latest products are downloadable. Manuals for a wide variety of products, ranging from the latest models to long-established ones, are available for download. Use registration is required. Lists of obsolete models in individual product categories Lists of models certified to UL, CE, CCC and other standards Maintenance and Troubleshooting for PLCs Pagetop