80 • PROFINET IO 750-340DiagnosticsWAGO-I/O-SYSTEM 750PROFINET IOThe BlockType in the head structure of the data set corresponds to the valuefor the channel diagnostics (0x0010). The length defines the followingdiagnostics data for faulty sub-modules or channels.The data for the channel diagnostics is triggered using a general structure (seeChannelDiagnosis or ExtChannelDiagnosis), which is followed bythe fault indication of the respective channels. The general structure has alength of 10 bytes and is composed of as follows:Byte-offset Data type Description0 / 1 WORD Module slot for the alarm sourceRange 0 ... 1282 / 3 WORD 0x00 0x01 Sub-module slot for the alarm source = 14 / 5 WORD 0x80 0x00 ID of the alarm source = sub module (0x8000)BYTE 0x08 Fault type = upcoming fault (0x08)6 / 7BYTE 0x00 Reserved (0x00)8 / 9 WORD Fault type = diagnostics for the sub module0x8000 Channel Diagnostics0x8002 Extended channel diagnosticsAs already mentioned, special data sets of faulty sub-modules or channels arefollowing the general structure. This information may be repeated dependingon how many different fault messages exist for the channels of a sub-module.The number of existing channel diagnostics data sets can be determined usingthe length indicated in the head structure.The following sub-chapters describe the standardized and extended channeldiagnostics information that is supported by the coupler.3.1.7.2.1.1 Channel DiagnosticsThe channel diagnostics is set by the coupler when external channel faultsoccur (e.g. short circuits or overvoltage). These types of faults are defined inthe PROFINET IO specification.The fault type (SubStructureDefined) contains the value for channeldiagnostics (0x8000).Each fault of a signal channel or sub-module is described in a data set (seeChannelDiagnosisData). The structure of the data set has 6 bytes and iscomposed of as follows:
