{"id":3338,"date":"2025-04-18T05:06:45","date_gmt":"2025-04-18T05:06:45","guid":{"rendered":"https:\/\/webprojects.cloud\/wordpress\/splatco\/?post_type=spl_knowledgebase&p=3338"},"modified":"2025-06-10T09:32:53","modified_gmt":"2025-06-10T09:32:53","slug":"modbus-supported-functions","status":"publish","type":"spl_knowledgebase","link":"https:\/\/webprojects.cloud\/wordpress\/splatco\/knowledgebase\/tutorials-application-notes-and-white-papers\/serial-communications\/modbus\/modbus-supported-functions\/","title":{"rendered":"ModBus: Supported functions"},"content":{"rendered":"\n

The following table lists the ModBus functions supported in SPLat, with a brief description of the function. This is not meant as a detailed treatment of ModBus; you should refer to the published specifications online at places like modbus.org<\/a>. The hotlinks in the M\/S column take you to the corresponding ModBus master script command (described later).<\/p>\n\n\n\n

Function<\/th>Name<\/th>M\/S<\/th>Modicon ref<\/th>Description<\/th><\/tr>
1<\/td>Read Coil(s)<\/td>M<\/a>\u00a0S<\/td>0xxxx<\/td>Reads out one or more contiguous coils (external outputs or internal 1-bit variables, i.e. semaphores)<\/td><\/tr>
2<\/td>Read inputs<\/td>M<\/a>\u00a0S<\/td>1xxxx<\/td>Reads one or more contiguous inputs. In a slave SPLat accesses the debounced inputs.<\/td><\/tr>
3<\/td>Read holding registers<\/td>M<\/a>\u00a0S<\/td>4xxxx<\/td>Reads one or more contiguous Modicon type 16-bit holding registers. In a SPLat slave the addresses are mapped to\u00a0RAM<\/a>\u00a0(data memory).<\/td><\/tr>
4<\/td>Read input registers<\/td>M<\/a><\/td>3xxxx<\/td>Reads one or more contiguous Modicon type 16-bit input registers. Some 3rd party products map internal values to these registers. Not supported in SPLat slave.<\/td><\/tr>
5<\/td>Force single coil<\/td>M<\/a>\u00a0S<\/td>0xxxx<\/td>Forces a single coil (Modicon: external output or internal 1-bit variable, i.e. semaphore). Force external outputs with caution! SPLat slave allows selective write protection.<\/td><\/tr>
6<\/td>Preset single holding register.<\/td>M<\/a>\u00a0S<\/td>4xxxx<\/td>Forces a value into a single Modicon type 16-bit holding register. In a SPLat slave the addresses are mapped to RAM (data memory).<\/td><\/tr>
15<\/td>Force multiple coils<\/td>M<\/a>\u00a0S<\/td>0xxxx<\/td>Forces one or more contiguous coils (external outputs or internal 1-bit variables, i.e. semaphores). Force external outputs with caution!<\/td><\/tr>
16<\/td>Preset multiple holding registers.<\/td>M<\/a>\u00a0S<\/td>4xxxx<\/td>Forces data values into one or more Modicon type 16-bit contiguous holding registers. In a SPLat slave the addresses are mapped to RAM (data memory).<\/td><\/tr><\/tbody><\/table><\/figure>\n","protected":false},"excerpt":{"rendered":"

The following table lists the ModBus functions supported in SPLat, with a brief description of the function. This is not meant as a detailed treatment…<\/p>\n","protected":false},"author":1,"featured_media":0,"parent":3328,"menu_order":2,"template":"","class_list":["post-3338","spl_knowledgebase","type-spl_knowledgebase","status-publish","hentry"],"acf":[],"yoast_head":"\nModBus: Supported functions - SPLat Controls<\/title>\n<meta name=\"robots\" content=\"noindex, follow, max-snippet:-1, max-image-preview:large, max-video-preview:-1\" \/>\n<meta property=\"og:locale\" content=\"en_US\" \/>\n<meta property=\"og:type\" content=\"article\" \/>\n<meta property=\"og:title\" content=\"ModBus: Supported functions - SPLat Controls\" \/>\n<meta property=\"og:description\" content=\"The following table lists the ModBus functions supported in SPLat, with a brief description of the function. 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