eWON General Reference Guide - Esco Drives & Automation

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General Reference GuideIO Servers Configuration5.13.3.1 Value NameThe syntax is the following:Symbol Memory Type Modifier allowed AddressM Internal Memory B, C, W, S, D, L, F Byte offsetSM Special Memory B, C, W, S, D, L, F Byte offsetV Variable Memory B, C, W, S, D, L, F Byte offsetC Counter W, S Object numberHC High-Speed Counter D, L Object numberT Timer D, L Object numberAI Analog Inputs W, S Byte offsetAQ Analog Outputs W, S Byte offsetI Discretes Inputs B, C, W, S, D, L, F Byte offsetQ Discretes Outputs B, C, W, S, D, L, F Byte offsetImportant: All addresses are always in BYTES (except for Counters and Timer that are objects).Note: The Modifier can be omitted, the modifier in bold will be used.(*) Important: See “Tags are stored as Float” on page 67ExamplesTable 107: S7200 Memory types and address schemeSymbol 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 108: S7200 ModifiersaddressMW4HCL1AQW5IB3I5#2point tothe Word at address 4 (in bytes) in the Internal Memorythe HighSpeed Counter number 1 and read it in Signed DWordthe Word at address 5 (in bytes) in the Analog Output zonethe Byte at address 3 (in bytes) in the Discrete Inputs zonethe bit 2 from the Byte (read the ‘Bit access modifier’ note below) at address 5(in bytes) in the Discrete Inputs zoneTable 109: S7 200 register address examples• Bit access modifier:For Memory Type M, SM, V, I and Q, it is possible to access a single bit.A #x must be appended to the Value name.As the address in always in byte, the Bit index goes only from 0 to 7, and no Modifers are allowed.The syntax can be used for reading bits and for writing them as well.Example:AQ10#5 represents bit 5 of Byte 10 in Analog Output zone.invalid:IW5#2 wrong because there is a ModifierI5#10 wrong because bit number greater than 7RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 133
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 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 110: Tag Status meaning5.13.3.2 Global Device AddressThe device address is either appended to the ValueName in the Item Name definition or entered in the Topic global address fields.The device address is composed like the following:PPInode address: PPI node address of the PLCPPI, PPI node addressReach by PPI the PLC with the node address 4ISOTCPIP address : IP address of the PLC (ex: 10.0.120.204)Called TSAP : Transport Service Access Point (ex: 4D.57)ISOTCP, IP address, CalledTSAPReach by ISOTCP the PLC at IP 10.0.120.204 with the TSAP 4D.57Table 111: PPI/ISOTCP device address syntax5.13.3.2.1 ISOTCP polling:You can always use the TSAP 4D.57. This is the default TSAP for a Step 7-Micro/win connection.If you specify your own connection in the S7-200, be sure to:- use the same TSAP for the Server and the Client (ex: Local TSAP:12.00, Remote TSAP:12.00)- Check the "Enable the Keep Alive function for this connection" feature for this connection otherwhise the eWON will not be able to poll thedevice after a connection lost due to the eWON reboot.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 134
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General Reference GuideIntroduction
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General Reference GuideeWON Configu
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