eWON General Reference Guide - Esco Drives & Automation

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General Reference GuideExport Block Descriptors8.2.3 $st [Start Time] and $et [End Time]These 2 fields are used to limit the time range of an export operation. $st and $et provide the start and end time of the export. The parameterformat is the same for both fields. There are 3 different formats for the $st, $et parameter:• Relative time• Absolute time• From last $ut (see also “$ut [Update Time]” on page 170).8.2.3.1 $st, $et with relative timeSyntax:$st_([s]|[m]|[h]|[d])100 _ = back(h,m,s,d = Hour, min, sec, day. 100 is the amount)This represents a time regarding to the current time expressed in days, hour, minutes or seconds. If no letter is specified minutes are considered.Examples:$st_m10$et_0$st_d210 minutes in the past0 minutes in the past (= now)2 days in the past8.2.3.2 $st, $et with absolute timeSyntax:$stDDMMYYYY[[_HHMMSS][[_mmm][[_I][[_T]]]]]Table 139: $st with relative time examplesWhere:DDMMYYYYHHMMSSmmmITMeans Day, Month, Year, 8 characters. This parameter is required.Means Hour, Minute, Second, 6 characters. This parameter is optional (0 used by default)Means milliseconds (000 to 999) 3 characters. This parameter is optional but if present, HHMMSS must alsobe specified.Means intra sec counter. This value is present when receiving a historical logging from the eWON. It can bespecified in export request to allow precise repositioning in the historical file. This parameter is optional, but ifpresent, HHMMSS and mmm must also be specified.Means Tag id. As for I, this parameter is used for precise positioning in historical file. This parameter isoptional, but if specified, HHMMSS, mmm and I must be present also.Table 140: $st parametersWhen ALL the Tags are specified, the Tag values are output in chronological order. For the same time there can be 2 Tag values. In order toreposition correctly in the file, it is necessary to provide the last Tag output during a previous export.Examples:$st01012000_120000$st01012000_120000_0101 jan 2000 at 12 AM1 jan 2000 at 12 AM + 10 msecTable 141: $st with absolute time examples8.2.3.3 $st , $et with Last timeBy adding the $ut command in an Export Block Descriptor, you can ask the eWON to remember the time of the last point exported, this time canbe used for the next export.The last time is reset when the eWON boots.Syntax:$stLL is the time parameter meaning last time.RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 169
General Reference GuideExport Block Descriptors8.2.4 $ut [Update Time]This field has no parameter, it means that at the end of this export, the time of the last point exported must be saved in the eWON so that it canbe used as a reference time for a later call.Example:$stL$et_0$utThis sequence will specify a time range from last time to current time AND will ask to update the last time at the end of the export.The last time is stored on a per Tag basis if one Tag is specified for the export. A global last time can also be saved if "ALL Tag" is specified in anexport.8.2.5 $tn [Tag Name]This field is used to specify a Tag name. It is required for graph commands. The parameter specified is the name of the Tag. When a $tn field canbe specified for an export and no $tn is given, then the command is executed for ALL the Tags.Example:$tnMyTag(MyTag is the name of the Tag)8.2.6 $ct [compression format]This field is only applicable when sending a file from the eWON to an FTP server, or as an attachment to an email.The compression format is gzip (http://www.gzip.org). So that the unique argument to add after the field "$ct" is "G".Example:Putftp "test2.txt.gz","[$dtUF $ctG $uf/test.txt]"Or:SENDMAIL "destinator@provider.net", "", "Subject", "Mail body &[$dtUF$uf/usr/test.txt $ctG $fn/test2.txt.gz]"Note:If you give to the destination file the ".gz" extension only (and not “.txt.gz” for example), the destination file will be correctly exported,but in this case you will have to indicate the extension when uncompressing (“.txt“ in the above case).You can then use a tool such as Winrar* to extract the file; it will be extracted in a folder named “test2.txt”.*You can download a free trial version of this tool at the following address: http://www.rarlab.com/download.htm.8.2.7 $se [Script Expression]This field is only required for $dtSE export data. The $se parameter specifies the "script expression" to compute. Usually, the $se parameter willbe inserted between quotes because if a $ is found in the expression it will be considered as the end of parameters.Example:$dtSE $se"A$"(Exports the content of A$)RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 170
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