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5.3 Modbus IO server 5.3.1 Introduction General Reference Guide IO Servers Configuration The MODBUS IO Server setup is the standard remote IO communication setup of the eWON. It is used to configure: • The eWON as a Modbus RTU master. • The eWON as a Modbus TCP slave and master. The first feature (Modbus TCP slave) is specific to the MODBUS IO server; it is actually designed to provide access to eWON Tag values and, unlike all the other IO servers, for interfacing field values with the eWON. The second feature (MODBUS Master) is the actual IO server feature that provides an interface to the field values as a common IO server. The eWON MODBUS IO server will give access to values in equipments having a MODBUS interface. The interface can be: • RS485 / RS422 / RS232 – MODBUS RTU protocol will be used • ETHERNET/PPP – MODBUS TCP protocol will be used. The eWON can mix access to MODBUS RTU and MODBUS TCP, depending on the way the Tag address is defined. 5.3.2 Setup 5.3.2.1 Setup for eWON Server Figure 83: Modbus TCP Server configuration This page defines the eWON configuration when used as a Modbus TCP slave. As described in the Tag configuration paragraph, each Tag can be published to Modbus TCP so that a Modbus TCP can read their values. This setup screen defines the eWON address, and globally enables or disables the Modbus TCP slave feature. eWON Server Properties Description eWON server enabled Modbus TCP Unit address 5.3.2.2 Setup for eWON IO server and Gateway - COM Setup Globally enables or disables the Modbus TCP Server feature. If disabled, then any request from a Modbus TCP master will be rejected, even if Tags are published. This feature is used by some gateway but can usually be left to 1 because Modbus TCP appears as a point to point connection. Table 63: eWON server configuration - eWON as Modbus TCP slave Figure 84: Modbus communications configuration If more than one Serial port are available, you must choose on which COM the modbus request will be sent. This configuration part defines the RS485 setup. The four first fields are used to define the baud rate, parity, number of stop bits and the reply timeout (in msec – usually 1000 msec). Warning: When there are multiple IO servers using potentially the serial line, then the unused IO server must be Cleared or the baudrate must be set to Disabled. RG-001-0-EN ver 1.14 eWON® - 02/05/2012 - ©eWON sa Page 97
General Reference Guide IO Servers Configuration Example: if Modbus and UniTE IO servers are available, at least one of them must have its baud rate set to Disabled. If not the case, one of the IO servers will not be able to use the serial line and it will be disabled, with an error written in the event log. 5.3.2.3 Topic configuration Figure 85: Modbus topics configuration Three topics can be used for the IO Server. These topics are used to give a common property to a group of MODBUS Tag like: • Enable/Disable • Poll rate • Slave address (Modbus RTU) • Unit address and TCP/IP address (Modbus TCP) Modbus Server Properties Description Topic enabled Enables or disables polling of all the Tags in the topic. Slave address Poll rate Warning: Any slave address that is defined in the Topic configuration overwrites the slave address configured per Tag. If a Tag is defined with Tag Address: 40010,5 and the global address of the topic is 5 and 10.0.0.81, the Tag is entered as Modbus RTU but it is polled as Modbus TCP. So, if you need to address slaves Tag by Tag, let the topic address configuration empty. 5.3.2.4 Advanced parameters The slave address is a global parameter for all the Tags of the topic. If the slave is connected with Modbus RTU, Slave address must be entered and the IP address must be blank. If the slave is Modbus TCP, its unit address and its IP address must be entered. This defines the rate to which the Tag will be refreshed. In a complex application, we can imagine that some Tags must be refreshed every second – typically for digital input - and other every minute – typically: temperature-. Table 64: Modbus topic configuration Figure 86: Modbus advanced parameters configuration Extended parameters have been added to accommodate various special operating conditions. They are entered in the edit box at the bottom of the configuration page, conforming to the syntax below. Each parameter has a default value, so the advanced parameter edit box must only be filled with the parameters for which default values must be changed. (c.f. “Standard IO server configuration page” page 96). RG-001-0-EN ver 1.14 eWON® - 02/05/2012 - ©eWON sa Page 98
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eWON Family 500, 2001, 2001CD, 4001
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Table of content 5.4.3 Tag name con
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Table of content 8.3.3 $dtRL [Real
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2 The eWON login page 2.1 Access fr
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3.2 Users Setup The Users Setup pag
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3.3 System Setup General Reference
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3.3.1.2 Alarms (globals parameters)
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3.3.1.5 Task Planner Since Firmware
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General Reference Guide eWON Config
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When using modem port for VCOM, the
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3.3.3 Diagnosis 3.3.3.1 Overview Ge
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Each mechanisms provides you all or
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Select next server in case of error
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3.3.4.2.3 ADSL General Reference Gu
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5.14 HITACHI IO Server 5.14.1 Intro
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6.1 Real-time screen General Refere
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General Reference Guide Monitoring
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10 Appendix 10.1 Access to the eWON
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10.9 GSM modem Led behavior Figure
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