eWON General Reference Guide - Esco Drives & Automation

General Reference GuideIO Servers Configuration5.4.3.1 ValueNameDBxBy Data block x Byte offset y (0-255)DBxWy Data block x Word offset y (0 - 65535)DBxFyData block x Float offset y (+-3.4e38)DBxDy Data block x DWord offset y (-2147483648->2147483647) (*)MxBMxWMxFMemento x as byteMemento x as wordMemento x as real(*) Important: See “Tags are stored as Float” on page 67• Bit access modifier:MxD Memento x as double (*)Tx Timer x (0-65535)Cx Counter x (0-65535)Table 66: value names for NETMPI addressesIn any of the above items, it is possible to access a single bit (except for float items).#x must be appended to the Value Name. (Bit index goes from 0..31)The syntax can be used for reading bits and for writing them as well.Example:DB1W13#3 represents bit 3 of W13 in DB 1REM:Bit index range depends on a referenced item (for W, bit index maximum value is 15)• Status register:The STATUS Tag is a special Tag that returns information about the current state of the communication for a given device. As for other Tags, thestatus Tag ValueName is composed of:Status, Global Device Address• You can define a status Tag for each PLC 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 67: Tag Status meaning5.4.3.2 Device AddressThe device address is either appended to the ValueName in the Item Name definition, or entered in the Topic global address fields.The device address is composed of: RemoteStationAddress,eLinkIpAddress:• RemoteStationAddress: is the PLC’s MPI address• eLinkIpAddress: is the eLINK IP address.Important:If the PLC address is defined at the Topic level, it can be omitted in the Tag definition. In that case the Tag name will only containthe "ValueName".If the PLC address is specified at the Topic level, it will replace any address defined Tag by Tag.RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 95