eWON General Reference Guide - Esco Drives & Automation

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General Reference GuideIO Servers Configuration5.12.3 Tag name conventionIO Server NameS73&400ATopic NameBItem NameCValueName, Global Device AddressValueNamePLC address is defined Tag by TagTopic PLC Address is used.Table 99: S73&400 IO server - Tag name convention tableThe Item Name can contain the PLC address where the value is polled, or not. If the address is also specified at the topic level, the addressspecified at Tag level will be ignored.5.12.3.1 Value NameThe syntax is the following:Symbol Memory Type Modifier AddressDBx Data Block number x B, C, W, S, D, L, F Byte offsetM Internal Memory B, C, W, S, D, L, F Byte offsetC Counter W, S Object numberT Timer W, S Object numberI Discrete Inputs B, C, W, S, D, L, F Byte offsetQ Discrete Outputs B, C, W, S, D, L, F Byte offsetPI Peripheral Inputs B, C, W, S, D, L, F Byte offsetPQ Peripheral Outputs B, C, W, S, D, L, F Byte offsetTable 100: S7 300-400 Memory typesImportant: All the addresses are always in BYTES (except for Counter and Timer that are objects)Note: The Modifier can by omitted, the modifier in bold will be used (DB type must have a modifier).Symbol Modifier value rangeB Byte 0 .. 255C signed Byte -128 .. 127W Word 0 .. 65535S signed Word -32768 .. 32767D DWord 0 .. 4294967296 (*)L signed DWord -2147483648 .. 2147483647 (*)F Float +/- 3.4e38Table 101: S7 300-400 Modifiers(*) Important: See “Tags are stored as Float” on page 67RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 127
General Reference GuideIO Servers ConfigurationExamplesaddressMW4CS1point tothe Word at address 4 (in bytes) in the Internal Memorythe Counter number 1, read it as Signed WordDB2L5 the DWord at address 5 (in bytes) in the Data Block 2IB3I5#2the Byte at address 3 (in bytes) in the Discrete Inputs zonethe bit 2 from the Byte (read ‘Bit access modifer’ note below) at address 5 inthe Discrete Inputs zoneTable 102: S7 300-400 register address examples• Bit access modifier:In any Memory Type (excluding Counter and Timer), it is possible to access a single bit.A #x must be appended to the Value name.As the address is always in byte, the Bit index goes only from 0 to 7, no Modifer are allowed (except B to separate DB block from theaddress).The syntax can be used for reading bits and for writing them as well.Example:DB1B13#3 represents bit 3 of Byte 13 in DB 1invalid: IW5#2 wrong because there is a ModifierI5#10 wrong because bit number greater than 7• 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 103: Tag Status meaning5.12.3.2 Global Device AddressThe device address is either appended to the ValueName in the Item Name definition or entered in the Topic global address fields.RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 128
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