eWON General Reference Guide - Esco Drives & Automation

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General Reference GuideExport Block Descriptors8.3.10 $dtIV [Instant Values]8.3.10.1 Instant value - general informationInstant value means values of Tags at a given time. The file of instant value contains for each Tag the following information:TagIdTagNameValueAlStatusAlTypeId of the TagName of the Tag (in text mode)Current value of the TagCurrent alarm status of the TagType of the current alarmTable 166: $dtIV - instant value file’s informations• The file containing the instant values for every Tag is available in binary or text format; you can download the instant values filedirectly from the root of the eWON root file list, or you can address it by using an Export Block Descriptor.• The instant values file normally contains all the Tags, but there is an additional feature that allows obtaining only the instant valuesfrom specific Tags.• In the Tag definition, there is a new config in the "Tag visibility section".• There is a group of 4 check boxes, each of them being associated to a group called A, B, C, D (4 groups).• Every Tag can belong to no group, one group, or more than one group.• These groups are only used when reading the instant values using an Export Block Descriptor; in that case there is an additional fieldin the Export Block Descriptor. That allows to request the instant values for the Tags belonging to one or more groups.IMPORTANT:Regardless of the group definition for each of the Tags, the inst_val.txt and inst_val.bin files (see below) always return the instantvalue for ALL Tags.These groups have nothing in common with the A, B, C topics of the IO servers. They are defined in the context of the InstantValues!• Root file accessIn the eWON root folder (FTP access or file transfer) you will find the following 2 files:inst_val.txtinst_val.bininstant values in text modeinstant values in binary mode8.3.10.2 Alarm status code valuesThe below table lists the different values that the field AlStatus can have, depending on the Alarm State and of the action the user has performedon it:Alarm StatusAlarm StatusValueAlarm status explanationsNONE 0 Tag is not in alarm statusPRETRIGGER 1Tag is in pretrigger alarm statusWarning: we assume there is no alarm ifAlStatus value
General Reference GuideExport Block Descriptors8.3.10.3 Alarm type valuesThe table below lists the different values that the field AlType can have, depending on the type of threshold that has been stepped over by theTag value, depending on the configuration set in the Tag’s configuration page:Alarm Type Alarm Type Value Alarm type explanationsNONE 0 The Tag value is inside of the limits beyond of which the alarm is triggeredHIGH 1LOW 2LEVEL 3HIGH_HIGH 4LOW_LOW 5The Tag value exceeds the value entered in the Alarm Level High field fromthe Tag configuration pageThe Tag value is less than the value entered in the Alarm Level Low fieldfrom the Tag configuration pageThe Tag value matches the Boolean Alarm Level value defined in the Tagconfiguration pageThe Tag value exceeds the value entered in the Alarm Level HighHigh fieldfrom the Tag configuration pageThe Tag value is less than the value entered in the Alarm Level LowLowfield from the Tag configuration pageTable 168: inst_val.txt file - alarm type values8.3.10.4 Writing Instant Values to the eWONThe instant values file can also be written to the eWON. The file must be written by FTP to the ftp root folder and must be written to the file.All the Tags value present in the file will be used to change the corresponding Tag in the eWON. If a Tag is not found, then it will be ignored.• Writing in binary format:• The file format must comply exactly with the definition (see below) and all Tags are identified by their Tag ID.• Writing in text format:• When writing the instant value in text format, there are different possibilities to address the Tag:• If a "TagName" column is present, then the Tags will be accessed by their name (even if a "TagId" column is present)Example:"TagId";"TagName";"Value";"AlStatus";"AlType"1;"M1";10.000000;0;02;"M2";20.000000;0;0If a "TagName" column is NOT present, the Tags will be accessed by their id:"TagId";"Value";"AlStatus";"AlType"1;10.000000;0;02;20.000000;0;0WARNING:Remember that the Tag Id is not an index, but a unique number that has been allocated to the Tag when created, and cannot bereused unless the configuration is erased and a new configuration is created.8.3.10.5 Binary file formatThe file starts with a Header that can be represented by the following C structure:struct InstantValueHeader{int Rev;int RecSize; //Record sizeint NbTag; //Number of Tags exportedint RecFlag; //Reserve (must be set to 0)int Reserved2;}RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 184
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