eWON General Reference Guide - Esco Drives & Automation

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General Reference GuideIO Servers Configuration5.16.3 Tag name conventionIO Server NameSNMPATopic NameBItem NameCValueName, Global Device AddressValueNamePLC address is defined Tag by TagTopic PLC Address is used.Table 128: SNMP IOserver - Tag name convention tableThe Item Name can contain the Device address where the value is polled, or not. If the address is also specified at topic level, the addressspecified at Tag level will be ignored.5.16.3.1 Value NameAs the SNMP use an Abstract Syntax Notation (ASN), encode the full OID (Object ID) of the data you want to Read/Write.You cannot import MIB files into the eWON.Only INTEGER, 32bits COUNTER, GAUGE, UNSIGNED, TIMETICK object types are supported.All these objects are Integer and could be truncated when eWON will store them as Float (See “Tags are stored as Float” on page 67).Examplesaddresspoint to.1.3.6.1.2.1.4.3.0 read the .iso.org.dod.internet.mgmt.mib-2.ip.ipInReceives object.1.3.6.1.2.1.4.3.0,10.0.0.55,public,privateread the .iso.org.dod.internet.mgmt.mib-2.ip.ipInReceives object at the IP10.0.0.55 using community “public” for reading and the community “private”for writing.Table 129: SNMP address examplesIMPORTANT:The address of SCALAR objects ends with a 0 while the address of array items ends with their index in the array (starting from 1).For example, to read .iso.org.dod.internet.mgmt.mib-2.ip.ipInReceives that have the address “.1.3.6.1.2.1.4.3”, you must add a “.0” at the endto obtain “.1.3.6.1.2.1.4.3.0”.And to read .iso.org.dod.internet.mgmt.mib-2.interfaces.ifTable.ifEntry.ifMtu (“.1.3.6.1.2.1.2.2.1.4“) of the second interface, because thisobject is a table, you must add “.2” at the end to obtain “.1.3.6.1.2.1.2.2.1.4.2”.NOTE: We recommend you to check the SNMP address with an SNMP Client (like Getif http://www.wtcs.org/snmp4tpc/getif.htm) to find theright address.Example: Searching in the MIB file of a network printer to find the address of the “TotalNumberOfPagePrinted”, we found :.iso.org.dod.internet.mgmt.mib-2.printmib.prtMarker.prtMarkerTable.prtMarkerEntry.prtMarkerLifeCount at address “.1.3.6.1.2.1.43.10.2.1.4”Using the MIB file with Getif to retrieve the wholeaddress of this Counter, we see that the Counter is ina 2 dimension table and we need to add “.1.1” to getits value.RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 145
General Reference GuideIO Servers Configuration• Status register:The STATUS Tag is a special Tag that returns information about the current state of communication for a given device. As for the other Tags, thestatus Tag ValueName is composed of:Status, Global Device Address• You can define a status Tag for each Device used.• If you use the status address, the Tag must be configured as analog.0Communication not initialized. Status UNKNOWN.If no Tag is polled on that device address, the communication status is unknown.1 Communication OK.2 Communication NOT OK.Table 130: Tag Status meaningRG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 146
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