eWON General Reference Guide - Esco Drives & Automation

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General Reference GuideIO Servers Configuration5.3.3 Tag name conventionIO Server configurationIO Server NameTopic NameMODBUSA or B or CItem Name ValueName,SlaveAddress The PLC Address is defined Tag by Tag on serial link (RTU Master)ValueName,SlaveAddress,IPAddressValueNameThe PLC Address is defined Tag by Tag on TCP linkThe Topic PLC address is used5.3.3.1 ValueNameThe Modbus IO Server Tags can be classified following ranges of values. Two types of ranges are used. The two following tables describe thedifferent ranges of value, for each of the two standards.• First standard:Modbus Type IO Type Access Register addressCoil Digital Output R/W 1 9999Contact Digital Input R 10001 19999Input Register Analog Input R 30001 39999Holding Register Analog Output R/W 40001 49999Output Coil* Digital Output W 50001 59999Output Registers* Analog Output W 60001 69999Table 59: Modbus IO server Tag name convention: first standard• Second standard:Modbus Type IO Type Access Register addressCoil Digital Output R/W +1 +65535Contact Digital Input R +100001 +165535Input Register Analog Input R +300001 +365535Holding Register Analog Output R/W +400001 +465535Output Coil* Digital Output W +500001 +565535Output Registers* Analog Output W +600001 +665535Table 60: Modbus IO server Tag name convention: second standardThe second standard allows more than 9999 values in each range. Notice the "+" sign before the register value.* The two last ranges are used with non-standard equipments that do not allow the reading of some of their values. In this case, specifying theaddress in the "write only" ranges informs the eWON not to read the values after setting them, which is normally done in the other cases. If thoseregisters are read, the returned value will always be 0.RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 91
General Reference GuideIO Servers ConfigurationAfter the numerical value, the characters F, L, I, D or W can be used to specify how to read the value. The following table describes the differentcharacter meaning.CharacterWIDescriptionReads 1 register considered as 16 bits unsigned integer (DEFAULT IF NOT SPECIFIED)Reads 1 register considered as 16 bits signed integerD Reads 2 regs R1, R2 as a DWORD R1 is Less significant, R2 is most significant (32 bits, unsigned) (*)E Reads 2 regs R1, R2 as a DWORD R2 is Less significant, R1 is most significant (32 bits, unsigned) (*)L Reads 2 regs R1, R2 as a LONG R1 is Less significant, R2 is most significant (32 bits, signed) (*)M Reads 2 regs R1, R2 as a LONG R2 is Less significant, R1 is most significant (32 bits, signed) (*)FHReads 2 regs R1, R2 as a FLOAT R1 is Less significant, R2 is most significant (32 bits, signed)Reads 2 regs R1, R2 as a FLOAT R2 is Less significant, R1 is most significant (32 bits, signed)Table 61: the characters used to specify how to read the value(*) Important: See “Tags are stored as Float” on page 67When reading a 32 bits value, two consecutive registers or coils are read and combined e.g. 40001L,11 to access in Long representation the reg1 on the slave 11.Reading high 32 bits values involve a lost of precision in the mantissa because internally all the values are considered as float by the eWON.examples:addressmeaning40001,10 access the Holding Register at address 1 on the UnitID 101,11 access the Coil at address 1 on the UnitID 11+320234,12 access the Input Register at address 20234 on the UnitID 1240001,100,10.0.0.53 access the Hoding Register at address 1 on the UnitID 100 at IP address 10.0.0.5340010L,12 access the LONG Holding Register at address 10 (and 11) on the UnitID 1240008F,15 access the FLOAT Holding Register at address 8 (and 9) on the UnitID 15Table 62: Modbus address examplesSTATUS TAG: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 ItemName is composed of:Status,AddressIf the address is omitted, the Topic address will be used e.g. status,11 points to the status of the slave 11You can define a status Tag for each address used.If you use the status MODBUS address, the Tag must be configured as analog:Tag value0MeaningCommunication 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 63: MODBUS status valuesRG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 92
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