ABB RETA-01 User Manual

Also see for RETA-01: User manual

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ABB RETA-01 User Manual Manual pdf 54 page image

Communication54Exception codesThe RETA-01 supports the Modbus exception codes shownbelow.Table 13. Supported exception codesFunction codesThe RETA-01 supports the Modbus function codes shown below.Table 14. Supported function codesExceptioncodeName Description01 Illegal func-tionUnsupported command02 Illegal dataaddressAddress does not exist or is read/write-pro-tected03 Illegal datavalueValue is outside minimum and maximumlimits. Parameter is read-onlyFunctioncodeName Description Modbusclass03 Read hold-ing registersReads the binary contents of theholding registers (4X references)in the slave.006 Preset sin-gle registerPresets a value into a single hold-ing register (4X reference).116 (10h) Preset multi-ple registersPresets values into a sequence ofholding registers (4X references).023 (17h) Read/WriteregistersPerforms a combination of oneread and one write operation in asingle Modbus transaction. Thefunction first reads a group of4XXXX registers and then writesnew contents to a another groupof 4XXXX registers.2