eWON General Reference Guide - Esco Drives & Automation

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General Reference GuideIO Servers Configuration5.14 HITACHI IO Server5.14.1 IntroductionThe Hitachi IOServer allows the eWON to poll tags belonging to a HITACHI EH series PLC using its serial link or Ethernet interface.eWON uses standard H protocol (for serial RS232), station number H protocol (for serial RS485), and Ethernet H-protocol (for Ethernet).No remote maintenance functionality is provided by this IO server.5.14.1.1 Setup5.14.1.1.1 COM configurationFigure 104: HITACHI IOServer: COM setupParameterBaud RateParityDescriptionSpeed of the Serial port.Available speeds are 1200, 2400, 4800, 9600, 19200 Bauds or disabledThe parity to apply (None / Even / Odd)Databits The number of bits in data (7 or 8)Stop bit(s) The number of Stop bits (1 or 2)HW modeReply TimeoutChoose the Hardware mode of communication:• Ful Duplex HW handshaking (by default)• Full Duplex NO handshaking• Half duplexMaximum time the eWON will wait for a valid message responseTable 112: HITACHI IOServer: COM parametersThe eWON implements Transmission Control Procedure 1 (One way activation Control Procedure).When half-duplex mode is used (RS485), the eWON acts as master. So, no other master may be on the bus (eg: control panel or host).RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 135
General Reference GuideIO Servers Configuration5.14.1.1.2 Topic configurationFigure 105: HITACHI IOServer: Topic configurationThree (3) topics can be used for the IO Server. These topics are used to give a common property to a group of Hitachi Tags like:• Enable/Disable• Global Device Address• Polling RateTopic configuration itemTopic enabledGlobal Device AddressPoll rateDescriptionEnables or disables polling of all the Tags in the topic.See below for the Device Address Syntax. If an address is specified here, it willreplace (overload) the address-defined Tag by Tag.Defines the refresh rate of the Tag name. In a complex application, we canimagine that some Tag names must be refreshed every second - typically fordigital input - and other every minute - typically: temperature-.Table 113: HITACHI IOServer: Topic configuration item definition5.14.2 Tag name conventionIO Server NameHITACHIATopic NameBItem NameCValueName, Global Device AddressValueNamePLC address is defined Tag by TagTopic PLC Address is used.Table 114: HITACHI IOserver - Tag name convention tableThe Item Name can contain the PLC address where the value is polled or not. If an address is also specified at topic level, the address specifiedat Tag level will be ignored.RG-001-0-EN ver 1.5 eWON® - 20/03/2009 - ©ACT'L sa Page 136
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eWON General Reference Guide - Esco Drives & Automation

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