Modbus Ethernet Bridge - Guillevin Industrial Automation Group
Contents
1. 27 2 8 Connecting the Ethernet 28 Configuring the Bridge 29 3 1 Before You Start 2 cr REL Re DA las 30 3 1 1 Configuration 30 34 2 Safety iei en en EE Sn IE RUMP AS 30 3 2 Connecting by the RS 232 31 3 3 Connecting by Telnet IP Address Not Assigned 32 3 4 Connecting by Telnet IP Address Assigned 33 3 5 Using the Configuration 34 3 5 1 Configuration 34 3 5 2 Modbus Master Device Additional Menu Items 34 3 5 3 Configuration Options 1 5 35 3 5 4 Viewing and Changing Configuration Parameters 35 3 5 5 Commands Default settings Save Quit without save 35 890 USE 155 00 vii Breite 178 mm Contents Option 1 Network IP Settings Option 2 Serial Mode Settings Option 3 Modem Control Settings Option 4 Advanced Modbus Protocol Option 5 Unit ID to IP Address Mapping Table2. How the Address Mapping Works Example Address Mapping Entering New Address Mapping Exiting the Mapping Menu Using Panel Software Using Concept or Modsoft Software Versions cce im da Cok ade Dur date Modbus Slave Address cos inc i M Le entr Using Other Software Intellution FIX 1 WinTech Modscan Worderware MMI 0 cc cece cee RR RR IR ln GlosSsaty en ee ta a ace a Eola ee viii 890 USE 155 00 Modbus to Ethernet Bridge 174 CEV 300 10 m Introducing the Modbus to Ethernet Bridge Mapping Modbus and IP Addresses m Front Panel Layout m Specifications Modbus to Ethernet Bridge 1 1 Introducing the Modbus to Ethernet Bridge Bridge Applications The Modicon Modbus to Ethernet Bridge provides a means for transacting messages between Ethernet TCP IP devices and Modbus serial devices It supports up to eight concurrent transactions between Modbus Master and Slave devices handling the conversion of TCP IP and Modbus RTU ASCII protocols transparently to the user application Ethernet no
3. URL Uniform Resource Locator The network address of a file UTP Unshielded Twisted Pair Atype of cabling consisting of insulated cable strands which are twisted together in pairs Winsock The Microsoft implementation of the Windows Sockets networking API based on the Berkeley UNIX Sockets interface for supporting TCP IP WWW World Wide Web A hypertext based distributed information system in which clients and servers are freely available 53 Modicon Square D and Telemacanique are PLC brand names from Schneider These products are sold in the US by Square in Canada Latin America Europe Asia Asia Pacific and Middle East by Schneider in Germany by AEG Schneider Automation in China and Persian Gulf by Schneider Automation in South Africa by ASA Systems Automation in Austria by Online United States France Germany Schneider Automation Inc Schneider Automation S A Schneider Automation GmbH One High Street 245 Route des Lucioles BP147 Steinheimer Strasse 117 North Andover MA 01845 F 06903 Sophia Antipolis Cedex D 63500 Seligenstadt Tel 1 978 794 0800 Tel 33 92 96 20 00 Tel 49 6182 81 2584 Fax 1 978 975 9400 Fax 33 93 65 37 15 Fax 49 6182 81 2860 31001624 890 USE 15500 V1 0
4. 4 2 4 2 1 4 2 2 4 2 3 Using Other Software Intellution FIX MMI The Bridge allows Windows workstations with Intellution FIX software to access Modbus devices by TCP IP over Ethernet The current version of this software does not support the Modbus TCP Unit_ID field Therefore if you have configured the Bridge for a Slave device at its serial port you must configure the Bridge s internal Slave Address parameter for that device This restricts the Bridge to a single Slave device at its port Refer to your software product s documentation for further information WinTech Modscan WinTech supplies ModScan32 software which can select and poll coils and registers from various Modbus RTU ASCII and Modbus TCP devices This software supports the Modbus TCP Unit_ID field so RS 485 multiple drop configurations are supported through the Bridge Refer to your software product s documentation for further information Worderware MMI The Bridge allows Windows workstations with Wonderware software to access Modbus devices by TCP IP over Ethernet You will need the Wonderware Modicon Ethernet I O Server software at version 7 0 0 15 or higher The current version of this software does not support the Modbus TCP Unit_ID field Therefore if you have configured the Bridge for a Slave device at its serial port you must configure the Bridge s internal Slave Address parameter for that device This restricts the Bridge to a si
5. 584 Note TSX SCx TSX Controllers Modbus Interface See TSX Note 584 Note Use cable AS W192 XXX with Adapter 110 XCA 204 02 pinouts in Figure 8 cable E TSX Note TSX Controller products offer multiple options for cable connection to the Bridge Refer to your product guidebook for more information 23 Installing the Bridge Hardware 2 5 Modbus Cable Pinouts References in this figure are to the devices listed in Table 8 on page 23 Figure8 Modbus Cable Pinouts it 110 XCA 203 01 Wire RJ45 Red 4 Black 3 Green 5 White 8 it 110 XCA 203 01 Wire RJ45 Black 3 Red 4 Green 5 Yellow 6 Brown 7 White 8 it 110 XCA 204 01 Wire RJ45 White 8 Red 4 Black 3 Green 5 it 110 XCA 204 01 Wire RJ45 Red 4 Black 3 Blue 1 Green 5 Orange 2 Yellow 6 Brown 7 White 8 E Adapter Kit 110 XCA 204 01 Wire RJ45 Red Black Blue Green Orange Yellow Brown White it 110 203 02 Wire RJ45 Red Black Orange 2 Green 5 6 7 8 White it 110 XCA 203 01 Wire RJ45 Red Black Green Orange Yellow Brown White Adapter None RJ45 Prog RJ45 Bridge
6. device at its serial port With this option the Bridge may be configured internally to use the Dest Index address exactly as received in the message or it may be configured to steer all messages to a fixed Slave address ignoring the Dest Index address m TCP IP Address as required 4 1 2 Modbus Slave Address This is an additional explanation of how the Bridge uses the Modbus Slave address In a Modbus TCP message sent to the Bridge the Slave address defined in panel software as the Dest Index address is stored in the Unit ID field of the message This field is used to address a unique Slave device on a Modbus network which may contain multiple Slave devices The Bridge s internal configuration contains a Slave Address parameter which can be set to override the Unit ID address received in the message Section 3 9 of this book describes how to set up the Slave Address parameter If the parameter is set to O zero the message will be delivered to the Slave device whose address is defined in the Unit ID field If the parameter is set to a non zero value range 1 255 the message will be delivered to the Slave device at that numerical address regardless of the contents of the Unit ID field For example If you are accessing the device at Modbus Slave address 34 you must m Set the Dest Index field to 34 and m Ensure the Bridge s internal Slave Address parameter is configured to O zero 46 Using Panel Software
7. is typically a router or other device DHCP Dynamic Host Configuration Protocol A network protocol used to configure IP addresses dynamically DHCP is an extension of BOOTP DNS Domain Name System A protocol within TCP IP used to find IP addresses based on host names field A logical grouping of contiguous bits that convey one kind of information such as the start or end of a message an address data or an error check frame A group of bits which form a discrete block of information Frames contain network control information or data The size and composition of a frame is determined by the network technology being used framing types Two common framing types are Ethernet Il and IEEE 802 3 FTP File Transfer Protocol A networking protocol used to exchange files between stations on a network or over the Internet gateway A device which connects networks with dissimilar network architectures and which operates at the Application Layer This term may refer to a router host A node on a network hostname A domain name given to a specific computer on a network and used to address that computer HTTP HyperText Transport Protocol A protocol used to deliver hypertext documents hub A device which connects a series of flexible and centralized modules to create a network 50 Glossary ICMP Internet Control Message Protocol A protocol within TCP IP used to report errors in datagram transmission Internet T
8. lt IP_address gt lt MAC_address gt Example UNIX arp s 192 168 1 23 00 20 4A 01 65 Al Example DOS arp s 192 168 1 23 00 20 4A 01 65 A1 Step 3 Connect by Telnet to Port 1 Open a Telnet connection to the IP address you assigned in Step 2 using port 1 This connection will fail but the Bridge will change its IP address to the one in this Telnet connection This will allow you to make your final connection for configuring the Bridge Step4 Connect by Telnet to Port 9999 Open a new a Telnet connection to the IP address using port 9999 This connection will succeed You should now see the Bridge s opening screen Schneider Automation Inc Modbus Bridge 174 CEV 300 10 Serial Number 101 161 Software Version V01 00 990402 Press Enter to go into Setup Mode wait to close At this screen press lt Enter gt to go to the Configuration Menu see Section 3 5 32 Configuring the Bridge 3 4 Connecting by Telnet IP Address Assigned If the Bridge already has an IP address stored in its memory and you know that address you can establish a Telnet connection to the Bridge using port 9999 If you do not know the IP address currently stored in the Bridge you can find that address by connecting to the Bridge s serial port and accessing its Configuration Menu Section 3 2 describes how to connect to the serial port If you want to verify the existence of an Ethernet device at a known IP address you can use the
9. the Bridge displays Delay after output RTS 0 1275 msec 5 ms resolution 00000 Wait for CTS to go active N Delay after CTS going active 0 1275 msec 5 ms res 00000 Delay dropping RTS after TX 0 1275 msec 5 ms res 00000 Example If you select the RTS CTS Variable mode and enter the following values RTS CTS Mode 1 Fixed 2 Variable 001 2 Delay after output RTS 0 1275 msec 5 ms resolution 00000 200 Wait for CTS to go active N Y Delay after CTS going active 0 1275 msec 5 ms res 00000 250 Delay dropping RTS after TX 0 1275 msec 5 ms res 00000 300 you are specifying that after the Bridge asserts RTS it should wait up to 200 ms for the serial port device to respond with CTS It will then wait 250 ms before sending data to the device It will wait 300 ms before dropping RTS at the end of transmission Your new values will be now be shown in the Bridge s Configuration Menu 3 Modem Control Settings RTS QUEDE e eR Variable Delay 0200 ms Hold 0250 ms CTS Input to TX Delay 0300 ms 39 Configuring the Bridge 3 9 Option 4 Advanced Modbus Protocol Settings When you select option 4 on the Configuration Menu the Bridge displays parameters for the type of Modbus device Slave or Master at its serial port Slave Device Slave device parameters are Slave Address 0 for auto or 1 255 fixed 000 Allow Modbus Broadcasts 1 Yes 2 No 002 Character Timeout
10. 0 msec increments The default is 5000 msec 5 sec 41 Configuring the Bridge 3 10 3 10 1 3 10 2 Option 5 Unit ID to IP Address Mapping Table If you have specified the Bridge s serial port Attached Device parameter as a Modbus Master see Section 3 7 you will need to map the Slave addresses received in messages from that Master to their intended IP address destinations The Bridge maps the one byte Modbus Slave address to an IP address for delivery on Ethernet How the Address Mapping Works The Bridge contains an address mapping table with eight entries Each entry maps a Modbus Slave address range 1 247 decimal to a standard IP address XXX XXX XXX XXX When the Bridge receives a message from the Master at its serial port the Bridge searches the table for a match between the message s Slave address and a Slave address entry in the mapping table If a match is found the Bridge forwards the message to the IP address specified in that location in the table If a match is not found a message timeout will occur If a match is found but there is not an active TCP connection at the IP address a message timeout will occur The Master application must provide its own method of handling the message timeout The Bridge begins its search at table location 1 and continues in the sequence 1 2 8 It stops at the first location which matches the Slave address and sends the message to the corresponding IP addre
11. 10 1275 msec 5 ms res 00050 Message Timeout 500 60000 msec 250 ms res 05000 Master Device Master device parameters are Character Timeout 10 1275 msec 5 ms res 00050 Message Timeout 500 60000 msec 250 ms res 05000 Slave Address The Bridge s Slave Address parameter specifies how the Bridge will direct messages received from Ethernet to a Slave device at the serial port Each message originated from a Modbus Master contains a Unit_ID field that addresses a Modbus Slave destination device The Bridge can be configured to use that Unit_ID address as received or to substitute a fixed address instead Setting the Slave Address parameter to 0 zero configures the Bridge to use the Unit_ID field as received in the message It will pass the message out its Modbus port to the Slave device addressed in the Unit_ID field Setting the Slave Address parameter to any non zero value causes the Bridge to always use that fixed value as the Slave address for all messages sent out its Modbus port regardless of the Unit_ID contained in the message This routes all messages to a single device The allowable non zero range for entering this value is 1 255 decimal Note that Modbus Slave addresses are valid in the range 1 247 only The default is 0 zero specifying the Bridge to use the received Unit_ID field 40 Configuring the Bridge Allow Modbus Broadcasts This parameter specifies whether the Bridge
12. 24 Installing the Bridge Hardware Figure 9 shows the layout of DB9 RJ45 and DB25 RJ45 Adapter Kits available from Schneider Automation Each kit contains three jumper wires and a pin insertion tool Follow the pinout diagrams in Figure 8 for assembling the adapter for your product Figure 9 DB to RJ45 Adapter Kits DB9M 110 XCA 203 01 Pin 1 d mm A B 9 Pin 1 Pin 1 DB9F 110 XCA 203 02 0000 00000 00000010 O DB25M 110 XCA 204 01 Pi Pin 1 Pin 1 DB25F 110 XCA 204 02 O inl D 000000000000 0000000000000 25 Installing the Bridge Hardware 2 6 Connecting the Serial Cable Wiring Terminals Figure 10 shows the connection for serial cables at the Bridge s wiring terminals Figure 10 Connecting the Serial Cable Wiring Terminals Signal RxD CTS RTS TxD Ground RS 232 Terminating Resistor 1200 1 8W R Signal Signal Data Data Ground RxD RxD TxD TxD Ground RS 485 RS 422 2 Wire 4 Wire 26 Installing the Bridge Hardware 2 7 Setting the Serial Port Switch Figure 11 shows the front panel switch for setting the Bridge s serial po
13. Hardware 2 4 Compatible Modbus Devices and Cables The Bridge connects directly by RJ45 cable to various products shown in Figure 7 Table 8 below lists other Modbus devices and their cable connections to the Bridge Connections are RS 232 unless indicated otherwise Cable pinout references are to the diagrams in Figure 8 on page 24 Table 8 Compatible Modbus Devices and Cables Device Device Cable Pinout Part Number Description Figure 8 MM PM 10 2xx PanelMate Plus 1000 RS232 A MM PM10 2xx PanelMate Plus 1000 RS422 B AS J478 000 Modbus Modem Fixed Modem Control AS J478 000 Modbus Modem Variable Modem Control D AS J347 001 184 384 Controller Modbus Interface E AS J375 000 Micro 84 Controller Modbus Interface E AS P190 xxx P190 Programming Panel E AS 884A xxx 884 Controller E AS 984x xxx 984A B X Controller E PC Serial Port 9 Pin F AS P892 000 ASCII RIO Interface G 140 CPU 424 xx Quantum Controller 486 G 140 CPU 534 xx Quantum Controller 586 G PC 0984 xxx 984 Controller 38x 48x 68x 78x Slot Mount G PC A984 xxx 984 Controller Compact G PC E984 24x 25x 984 Controller Compact G PC E984 455 984 Controller 484 Replacement G 984 Micro 984 Controller G NW BM85xxxx BM85 Bridge Multiplexer G Generic Modbus Serial Device 9 Pin G 110 VPU 192 00 Programmer Handheld H AS A584 xxx 584A L M Controller See
14. Modicon TSX Momentum Modbus to Ethernet Bridge User Guide 890 USE 155 00 Version 1 0 Square D s Schneider Electric Breite 185 mm H he 230 mm Breite 178 mm H he 216 mm 174 CEV 300 10 Modicon TSX Momentum Modbus to Ethernet Bridge User Guide 890 USE 155 00 31001624 04 99 Schneider Electric Preface Data Illustrations Alterations Data and illustrations are not binding We reserve the right to alter products in line with our policy of continuous product development Trademarks All terms used in this publication to denote Schneider Automation products are trademarks of Schneider Automation Incorporated All other terms used in this publication to denote products may be registered trademarks and or trademarks of the corresponding corporations Microsoft and MS DOS are registered trademarks of Microsoft Corporation Windows is a brand name of Microsoft Corporation in the USA and other countries IBM is a registered trademark of International Business Machines Corporation Intel is a registered trademark of Intel Corporation Copyright All rights are reserved No part of this document may be reproduced or transmitted in any form or by any means electronic or mechanical including copying processing or by online file transfer without permission in writing by Schneider Automation Incorporated You are not authorized to translate this document into any other language 1999
15. PING utility Refer to your Ethernet documents for a description of PING Telnet Host Requirement In order to use Telnet to set an initial IP address for the Bridge your Telnet host must be on the same Ethernet subnetwork as the Bridge both physically and in its IP range Otherwise the configuration will not work Figure 14 Example Telnet Connection Host Name 192 168 1 23 Port 9999 TermType vt100 co When the connection is established you should see the Bridge s opening screen Schneider Automation Inc Modbus Bridge 174 CEV 300 10 Serial Number 101 161 Software Version V01 00 990402 Press Enter to go into Setup Mode wait to close At this screen press lt Enter gt to go to the Configuration Menu see Section 3 5 33 Configuring the Bridge 3 5 3 5 1 3 5 2 Using the Configuration Menu When the Bridge enters its configuration mode it displays its opening screen Schneider Automation Inc Modbus Bridge 174 CEV 300 10 Serial Number 101 161 Software Version V01 00 990402 Press Enter to go into Setup Mode wait to close At this screen press lt Enter gt to see the Configuration Menu Configuration Menu The Configuration Menu shows the Bridge s current settings Here is an example Modbus Bridge Firmware Setup Schneider Automation Inc 1 Network IP Settings IP Address 2 ao 192 168 1 23 Default Gateway 192 168 1 30 Netm
16. Schneider Automation Incorporated All rights reserved Contents Contents Modbus to Ethernet Bridge 174 CEV 300 10 8 rt 9 1 1 Introducing the Modbus to Ethernet 10 1 1 1 Bridge Applications i i his s eR seen 10 1 1 2 Overview Installation and Configuration 11 1 2 Mapping Modbus and IP Addresses 12 1 2 1 Mapping for a Modbus 12 1 2 2 Mapping for a Modbus 12 1 3 Front Panel ees p eb eter Eure ee 14 14 Specifications zn arten ae BEA 16 Installing the Bridge Hardware 19 21 Mounting the Bridge on the DIN 20 2 1 4 Before You Install the 20 2 1 2 Mounting the Bridge ee eee 20 2 2 Connecting the Power Wiring 21 2 3 Connecting the Serial Cable RJ45 Port 22 2 4 Compatible Modbus Devices and Cables 23 2 5 Modbus Cable 24 2 6 Connecting the Serial Cable Wiring 26 2 7 Setting the Serial Port Switch
17. Wire terminal TxD or Tx Modbus signal RS 232 TxD Transmit Data RS 422 485 TxD Transmit Data 5 6 7 Wire terminal NC No connection 8 Wire terminal GND Modbus signal ground 9 Reset switch RST Push to reset and initialize Bridge 10 LED Red Fault or ON Fault in Bridge communication Configuration or Bridge is in Configuration Menu 11 LED Green Ready ON Bridge is ready for communication on both ports 12 LED Yellow Active Ethernet Flashing Indicates activity at Bridge s Ethernet port 13 LED Green Link Good ON Bridge has good connection at Ethernet port 14 Connector RJ45 Ethernet port RJ45 connector for Ethernet 10BaseT cable 15 Connector RJ45 Modbus port RJ45 connector for Modbus RS 232 or RS 485 cable 16 LED Yellow Modbus Tx Flashing Indicates transmission or upload at Modbus port 17 LED Yellow Modbus Rx Flashing Indicates reception at Modbus port 18 Switch Modbus interface UP Modbus port is RS 232 selection DOWN Modbus port is RS 422 485 19 Wire terminal DC Operating power positive 20 Wire terminal Ground Earth ground 21 Wire terminal DC Operating power negative 22 Wire terminal Ground Earth ground Modbus to Ethernet Bridge 1 4 Specifications Table 2 Power Parameter Specification Operating Power Nominal 12 or 24 V de Operating Power Range 9 30 V de Maximum Power Drain 3W Connection Screw terminals Fuse Extern
18. al supplied by customer Fuse value according to supply voltage see Maximum Power Drain Grounding Screw terminals provided for power ground and safety Earth ground Table 3 Environmental Parameter Reference Limits Temperature Operating IEC 68 2 14 0 60 C ambient Humidity Operating IEC 68 2 3 20 90 RH non condensing Table 4 Ethernet Interface Parameter Specification Protocol Ethernet v2 encapsulation TCP IP Version 4 Connector RJ45 connector for 10baseT cable Table 5 Serial Interface Parameter Specification Modbus Protocol RTU or ASCII Serial Protocol Switch selectable RS 232 or RS 485 Supports RS 232 RTS CTS handshaking RS 485 setting supports RS 422 devices Supports 2 wire and 4 wire RS 485 Supports up to 16 RS 485 devices Baud Rate 300 38400 2 Connector RJ45 connector screw terminals RJ45 port connects to Modicon M1 Compact 984 Slot Mount controllers by direct cable Cable adapters and adapter kits are available for other products Modbus to Ethernet Bridge Table 6 Packaging Parameter Description Dimensions 35 x 95 x 60 mm 1 4 x 3 7 x 2 4 in Enclosure Material High impact plastic Weight Product 0 5 kg 1 0 Ib Weight Shipping 0 9 kg 2 0 lb Mounting Method DIN rail DIN EN SO 022 35 mm Table 7 Agency Approval Parameter Spec
19. and Changing Configuration Parameters When you view the Bridge s configuration parameters you can retain their current values or change them Retaining the Current Value In all cases if you press lt Enter gt when the current value is displayed you will retain the current value For example if the Bridge s current values are as shown below pressing lt Enter gt at each field will retain that current value IP Address 192 168 001 023 Changing a Value To change a value type the new value into the field at the point shown on your screen For example to change the Bridge s IP address to 192 168 1 24 IP Address 192 168 001 023 24 In this example you would type the 24 immediately following the 023 Then press lt Enter gt for the Bridge to accept your entry Commands Default settings Save Quit without save These are your commands W E D efault settings Restores the Bridge s factory installed default settings for all parameters except the Ethernet IP settings S S ave Stores the current settings into the Bridge s memory and exits the configuration The Bridge will restart immediately using the current settings OQ Q uit without save Exits the configuration The Bridge will restart immediately using the settings it had prior to the last Save 35 Configuring the Bridge 3 6 Option 1 Network IP Settings When you select option 1 on the Configuration Menu the B
20. ask 191 VV CY Rev e Un 255 255 255 000 2 Serial amp Mode Settings Protocol Modbus RTU Slave s attached Serial Interface 19200 8 E 1 RS232 3 Modem Control Settings RTS Output Fixed High Active 4 Advanced Modbus Protocol Settings Slave Addr Unit ID Source Modbus TCP header Modbus Serial Broadcasts Disabled Character Message Timeout 00050 ms 05000 ms Commands D efault settings S ave Q uit without save Select Command or Parameter 1 4 to change Modbus Master Device Additional Menu Items If the serial port has already been configured for a Modbus Master device menu item 4 will omit references to a Slave device showing only the following 4 Advanced Modbus Protocol Settings Character Message Timeout 00100 ms 05000 ms Menu item 5 will show current mapping between Modbus addresses and IP addresses 5 Unit ID gt IP Address Table followed by the current mapping table 34 Configuring the Bridge 3 5 3 3 5 4 3 5 5 Configuration Options 1 5 These are your configuration options Each option is described in detail in the following sections of this book W 1 Network IP Settings See Section 3 6 W 2 Serial amp Mode Settings See Section 3 7 W 3 Modem Control Settings See Section 3 8 4 Advanced Modbus Protocol Settings See Section 3 9 W 5 Unit ID gt IP Address Table See Section 3 10 Viewing
21. ave address 10 Ethernet 192 168 001 024 Modbus IP Address Mapping Entry Bridge 010 192 168 001 024 Modbus Slave s Bridge routes message to Slave according to user defined setup Message Slave Address 10 JL dL Fixed Slave Address 1 247 These are the events in the message routing m The Modbus Master sends its message containing address 10 decimal to Bridge A m You have set an entry in the mapping table in Bridge A Your entry specifies that messages with address 10 are to be mapped to IP address 192 168 001 024 m Bridge B has that IP address and receives the message m Depending on the option you set in Bridge B the message is routed either to the Modbus Slave device at address 10 as specified in the message or to a fixed Slave address in the range 1 247 Modbus to Ethernet Bridge 13 Front Panel Layout Figure 4 Front Panel Layout Modbus to Ethernet Bridge Table 1 Front Panel Components See Figure 4 Item Component Name Purpose 1 Wire terminal RxD or Rx Modbus signal RS 232 RxD Receive Data RS 422 485 RxD Receive Data 2 Wire terminal CTS or Rx Modbus signal RS 232 CTS Clear to Send RS 422 485 RxD Receive Data 3 Wire terminal RTS or Tx Modbus signal RS 232 RTS Request to Send RS 422 485 TxD Transmit Data 4
22. des using TCP IP can function as Modbus Masters originating messages to the Bridge for delivery to Modbus Slave devices connected to the Bridge s Modbus port The Bridge forwards the messages to the Slave devices using Modbus RTU or ASCII protocol and returns their responses to the Master Figure 1 shows a typical application in which a Bridge connects two Modbus Masters on Ethernet to several Modbus Slave serial devices Figure 1 Bridging Between Ethernet and Modbus Bridge 174 CEV 300 10 Modbus The bridge also allows multiple Modbus networks to be linked together across an Ethernet connection Multiple Bridges can furnish an Ethernet link between widely separated Modbus networks This extends the message path beyond the cable lengths allowed for serial connections and allows a Master on any Modbus network to access Slave devices on another network 10 Modbus to Ethernet Bridge Figure 2 shows a typical application in which three Bridges join Modbus networks through a common Ethernet link Figure 2 Bridging Between Multiple Modbus Networks Modbus Ethernet Bridges 3 units 174 CEV 300 10 Modbus Overview Installation and Configuration The Bridge is designed for easy snap mounting on a standard DIN rail Its front panel has connectors for power ground Ethernet and Modbus cables It has a switch for selecting either an RS 232 or RS 422 485 interface for
23. erial Parameters 9600 8 E 1 Attached Device Identify the type of Modbus device Slave or Master attached to the Bridge s serial port The default is Slave Serial Protocol Identify the type of Modbus protocol RTU or ASCII to be used at the serial port The default is RTU Interface Type Identify the type of communication interface RS232 RS422 or RS485 used at the serial port The default is RS232 Enter Serial Parameters Enter the serial communication parameters used at the port delimited by commas lt baudrate gt lt databits gt lt parity gt lt stopbits gt The defaults are 9600 8 E 1 The allowed values are m Baud rate 300 1200 2400 4800 9600 19200 38400 m Data bits 7 8 m Parity E O N m Stop bits 1 2 38 Configuring the Bridge 3 8 Option 3 Modem Control Settings When you select option 3 on the Configuration Menu the Bridge displays RTS CTS Mode 1 Fixed 2 Variable 001 RTS CTS Mode RTS Request to Send and CTS Clear to Send are serial port signals that coordinate the starting and stopping of data requests between the Bridge and its port device You can customize the RTS CTS mode The options are Fixed or Variable The default is Fixed This causes the Bridge to apply RTS CTS with no time delays if you enter 2 to select the Variable option you can specify timing values to allow a slower device to respond in the RTS CTS dialog When you choose this option
24. ete an entry from the mapping table The Bridge will prompt you to enter the number of the table location you want to delete Here is an example Delete entry number 1 Changing an Existing Map Entry If you want to change an existing entry in the mapping table you must first delete that entry and then add your changes as a new entry m Press p to delete the current entry from the table m Press a to add a new entry into the table supplying the values for the new entry Exiting the Mapping Menu Press E to exit the Mapping Table menu and return to the initial Configuration Menu The Configuration Menu will display the new mapping see Section 3 10 2 Note that when you return to the Configuration Menu you must select Save on that menu to save the address mapping in the Bridge s memory Selecting Save will also restart the Bridge See Section 3 5 for a description of your Configuration Menu 43 Using Panel Software m Using Concept or Modsoft m Using Other Software 45 Using Panel Software 4 1 Using Concept or Modsoft 4 1 1 Software Versions To support Modbus TCP to the Bridge you need Concept version 2 1 or later or Modsoft version 2 6 or later Set the communications parameters as follows m Protocol TCP IP Dest Port 502 m Dest Index Modbus Slave address Note that the Bridge contains an internal Slave Address configuration option which might affect the delivery of messages to a Slave
25. he global interconnection of TCP IP based computer communication networks IP Internet Protocol A common network layer protocol IP is most often used with TCP IP Address Internet Protocol Address A 32 bit address assigned to hosts using TCP IP layer In the OSI model a portion of the structure of a device which provides defined services for the transfer of information MAC Address Media Access Control address The hardware address of a device A MAC address is assigned to an Ethernet TCP IP module in the factory network Interconnected devices sharing a common data path and protocol for communication node An addressable device on a communications network OSI model Open System Interconnection model A reference standard describing the required performance of devices for data communication Produced by the International Standards Organization packet The unit of data sent across a network PING Packet Internet Groper A program used to test whether a destination on a network can be reached port An access point for data entry or exit within a host using TCP services protocol Describes message formats and a set of rules used by two or more devices to communicate using those formats 51 Glossary repeater A device that connects two sections of a network and conveys signals between them without making routing decisions or filtering packets router A device that connects two or more sections of a networ
26. ification UL CSA CE Approved FM Pending Installing the Bridge Hardware Mounting the Bridge on the DIN Rail Connecting the Power Wiring wm Connecting the Serial Cable RJ45 Port Compatible Modbus Devices and Cables Modbus Cable Pinouts Connecting the Serial Cable Wiring Terminals m Setting the Serial Port Switch m Connecting the Ethernet Cable Installing the Bridge Hardware 2 1 2 1 1 Mounting the Bridge on the DIN Rail Before You Install the Bridge The Bridge has an Ethernet MAC address printed on the label on its side panel The address is required for your Ethernet network administrator to configure the Bridge Before you install the Bridge on the DIN rail write down the MAC address and give it to your network administrator The label may not be visible after you install the Bridge Warning COMMUNICATION DISRUPTION HAZARD Connecting any device to an active Ethernet network can disrupt communication on the network Before you connect the Bridge to your network and before you apply power to the Bridge heed the steps in Chapter 3 for configuring the Bridge in your application Failure to observe this precaution can result in injury or equipment damage Mounting the Bridge The Bridge is designed for mounting on a standard DIN rail Figure 5 shows how to mount the Bridge 1 Note the slot on the Bridge s rear panel Position the top edge of the slot over the top edge of
27. k and allows information to flow between them A router examines every packet it receives and decides whether to block the packet from the rest of the network or transmit it The router will attempt to send the packet through the network by the most efficient path server Provides services to clients This term may also refer to the computer on which the service is based socket The association of a port with an IP address serving as an identification of sender or recipient stack The software code which implements the protocol being used In the case of the NOE modules it is TCP IP STP Shielded Twisted Pair Atype of cabling consisting of several strands of wire surrounded by foil shielding twisted together subnet A physical or logical network within an IP network which shares a network address with other portions of the network subnet mask Used to indicate which bits in an IP address identify a subnet switch A network device which connects two or more separate network segments and allows traffic to be passed between them A switch determines whether a frame should be blocked or transmitted based on its destination address TCP Transmission Control Protocol TCP IP A protocol suite consisting of the Transmission Control Protocol and the Internet Protocol the suite of communications protocols on which the Internet is based 52 Glossary UDP User Datagram Protocol A protocol which transmits data over IP
28. may allow a Modbus Broadcast message to be sent to Slave devices at its serial port or not allow those messages Broadcast messages are those received by the Bridge containing a Unit_ID of 0 zero If Modbus Broadcasts are allowed broadcast messages are passed to the serial port as received with the Unit_ID contents of 0 zero If Modbus Broadcasts are not allowed the Unit_ID in the message is disregarded and the message is sent to Slave address 1 at the serial port The default is to not allow Broadcast messages to the serial port Character Timeout This parameter sets the timeout value between successive characters in messages If this timeout is exceeded the Bridge returns an error response to the originating Master Typically RTU protocol already contains a 3 5 character timeout but some serial devices might have internal interrupts or other delays which can cause pauses of 5 to 10 characters during transmission This parameter can be set to accommodate those devices The allowable range is 10 1275 msec in 5 msec increments The default is 50 msec Message Timeout This parameter sets the timeout value for the expected response from a Slave device If a response is not received within this time the Bridge continues with other tasks if any are pending from other Master devices The Master application must provide its own method of handling the message timeout The allowable range is 500 60000 msec 0 5 60 sec in 25
29. ngle Slave device at its port Refer to your software product s documentation for further information 47 Glossary 5 address On a network the identification of a station In a frame a grouping of bits that identifies the frame s source or destination API Application Program Interface The specification of functions and data used by one program module to access another the programming interface that corresponds to the boundary between protocol layers ARP Address Resolution Protocol A network layer protocol used to determine the physical address which corresponds to the IP address for a host on the network ARP is a sub protocol which operates under TCP IP BOOTP Bootstrap Protocol A TCP IP based protocol that allows a host to configure itself dynamically Provides a means to assign a host its IP address typically without user intervention bps Bits per second bridge A device that connects two or more physical networks which use the same protocol Bridges read frames and decide whether to transmit or block them based on their destination address client A computer process requesting service from other computer processes dest_idx The destination field in a Modbus message Corresponds to the Modbus device addressed in the message 49 Glossary default gateway The IP address of the network or host to which all packets addressed to an unknown network or host are sent The default gateway
30. onnecting by Telnet IP Address Not Assigned m Connecting by Telnet IP Address Assigned m Using the Configuration Menu Option 1 Network IP Settings m Option 2 Serial and Mode Settings m Option 3 Modem Control Settings m Option 4 Advanced Modbus Protocol Settings Option 5 Unit ID to IP Address Mapping Table 29 Configuring the Bridge 3 1 3 1 1 3 1 2 Before You Start Configuration Overview Your Bridge must be configured to match your system application Before you start to configure the Bridge get the Bridge s Ethernet and serial port parameters from your network administrator Here is your check list for obtaining the configuration information m Ethernet IP address m Ethernet Gateway address if applicable to your Bridge s network m Serial port interface RS 232 RS 422 RS 485 m Serial port communication Baud rate Data bits Parity mode Stop bits m Serial port modem controls RTS CTS timing values m Serial port device Modbus Master or Modbus Slave Modbus Protocol RTU or ASCII Modbus Timeout values Character timeout Message timeout Modbus Slave only Address source from Unit_ID header or Fixed address Modbus Slave only Allowing broadcasts to serial port Enable or Disable Modbus Master only Mapping of Modbus Slave addresses to IP addresses Safety Warning COMMUNICATION DISRUPTION HAZARD When you view or change the configuration of a running Bridge
31. or by pressing its Reset button The Bridge will enter its configuration mode and you will see this opening screen Schneider Automation Inc Modbus Bridge 174 CEV 300 10 Serial Number 101 161 Software Version V01 00 990402 Press Enter to go into Setup Mode wait to close At this screen press lt Enter gt to go to the Configuration Menu see Section 3 5 31 Configuring the Bridge 3 3 Connecting by Telnet IP Address Not Assigned If the Bridge does not yet have an IP address stored in its memory you can establish an initial connection using its MAC address This will allow you to access the Bridge s Configuration Menu assign an IP address and make it persistent in the Bridge If you are not sure about whether your Bridge has a stored IP address you must connect at its serial port and access its Configuration Menu Section 3 2 describes how to connect to the serial port Telnet Host Requirement In order to use Telnet to set an initial IP address for the Bridge your Telnet host must be on the same Ethernet subnetwork as the Bridge both physically and in its IP range Otherwise the configuration will not work Step 1 Get the Bridge s MAC Address The Bridge s MAC address is printed on the label on its side panel Example MAC address 00 20 4A 01 65 A1 Step 2 Issue an arp Command to the Bridge Open a Console or DOS window Issue an arp command to the Bridge with this syntax Syntax arp s
32. ridge displays its current Ethernet settings Here is an example IP Address 192 168 001 023 Set Gateway IP Address Y Gateway IP Address 192 168 001 030 Set Netmask N for default Y 255 255 255 000 IP Address The four entry fields for the IP address are shown as parenthesis To retain the Bridge s current IP address just press lt Enter gt at each field To assign a new IP address enter it into each field IP 0 0 0 0 Note that setting the IP address to all zero 0 0 0 0 causes the Bridge to be in an Address Not Assigned status It reports its address as 0 0 0 0 DHCP Disregard the reference to DHCP Set Gateway IP Address The Gateway IP Address is used only if your Ethernet network is larger than one continuous network it contains subnetworks Each node within the subnetwork can directly reach all the other nodes within the same subnetwork If the Bridge s subnetwork has a gateway to another subnetwork the Gateway IP Address parameter identifies the gateway s address Set Netmask If the Bridge s subnetwork has a gateway node the Bridge needs to know how to recognize which IP addresses it can communicate with directly on its own subnetwork and which addresses it must refer to the gateway node The Netmask subnetwork mask specifies which portion of the an IP address defines devices on the local subnetwork and which portion defines the entire subnetwork the device
33. rt interface Before you place the Bridge into service set the switch for the type of interface used in your application m UP RS 232 interface DOWN RS 422 or RS 485 interface Figure 11 Setting the Serial Port Switch Serial Port Switch UP RS 232 DOWN RS 422 or RS 485 Warning COMMUNICATION DISRUPTION HAZARD The serial port switch is a hardware function Itis not sensed by the Bridge s firmware Changing the switch setting while the Bridge is operating can disrupt communication on the network Do not change the switch setting unless you have first verified that it will be safe for your application Failure to observe this precaution can result in injury or equipment damage 27 Installing the Bridge Hardware 2 8 Connecting the Ethernet Cable Figure 12 shows the RJ45 port connection for the 10baseT Ethernet cable Figure 12 Connecting the Ethernet Cable Ethernet Port RJ45 Warning COMMUNICATION DISRUPTION HAZARD Connecting any device to an active Ethernet network can disrupt communication on the network Before you connect the Bridge to your network and before you apply power to the Bridge heed the steps in Chapter 3 for configuring the Bridge in your application Failure to observe this precaution can result in injury or equipment damage 28 Configuring the Bridge m Before You Start m Connecting by the RS 232 Port m C
34. s are on By comparing IP addresses with the subnetwork mask the Bridge can determine which addresses are on its subnetwork and which are not Users can define different subnetwork masks to support their requirements For example common Class C IP addresses assume a default subnetwork mask of 36 Configuring the Bridge OxFFFFFFOO or 255 255 255 0 using the lower 8 bits for the host part of the IP address This allows up to 255 devices on the local subnetwork This default mask is the example shown in the menu above If the user desires to have multiple subnetworks with up to 32 devices on each the subnetwork mask could define 5 host bits or 255 255 255 224 With this setting the decimal value 224 configures the lower 8 bits of the address with the upper of these bits addressing up to 8 subnetworks and the lowest 5 bits forming the part of the address for the 32 local devices If you wish to specify a subnetwork mask enter y atthe menu prompt and then enter your values for the mask Enter to use the default subnetwork mask of 255 255 255 0 37 Configuring the Bridge 3 7 Option 2 Serial and Mode Settings When you select option 2 on the Configuration Menu the Bridge displays its current serial port settings Here is an example Attached Device l Slave 2 Master 001 Serial Protocol 1 Modbus RTU 2 Modbus ASCII 001 Interface Type 1 RS232 2 RS422 3 RS485 001 Enter S
35. ss Thus any duplicate entry if one exists in the table will be ignored If you have configured the serial port for a Modbus Master you must use the mapping table to associate the ranges of Slave addresses in your Master application to the IP destination addresses for those Slaves Example Address Mapping If you have configured the serial port for a Modbus Master and have entered your mapping it will appear on the Bridge s initial Configuration Menu Here is an example 5 Unit ID gt IP Address Table 001 001 192 168 001 020 002 002 192 168 001 021 003 003 192 168 001 022 010 010 192 168 001 024 011 247 192 168 001 025 In this example the Bridge maps Modbus Slave address 1 to IP address 192 168 1 20 It maps Slave addresses 2 3 10 as shown in the table It maps any Slave address in the range 11 247 to IP address 192 168 1 25 42 Configuring the Bridge 3 10 3 3 10 4 Entering New Address Mapping When you select option 5 on the Configuration Menu the Bridge displays it current mapping Then it prompts A dd D elete E xit select function Adding a New Map Entry Press a to add a new entry into the mapping table The Bridge will prompt you to enter the new mapping values The values will go into the first available empty table location Here is an example Modbus addr from 000 1 Modbus addr to 000 1 Slave IP address 192 168 001 020 Deleting a Map Entry Press p to del
36. tching entry is not found the Bridge returns an exception response to the Master application Note that the original Modbus address is retained in the message transmitted to the IP destination Ifthe remote IP node is another Bridge the message s Modbus address can be used to identify a Slave device at that Bridge s serial port Mapping for aModbus Slave When you configure a Modbus Slave device or network with multiple Slaves at the Bridge s serial port you have two options for routing messages to a Slave destination You assign your choice during your configuration of the Bridge Your options are Message address routing or Fixed address routing You can specify that the Bridge must route each message to the Slave device that is identified in the Modbus address field ofthe message This allows you to address any Slave device in a network of up to 247 devices at the Bridge s Modbus port You can specify that the Bridge must route all messages to one fixed Slave address that you define in the Bridge s configuration With this option the Modbus address field is ignored and each message is routed to that fixed Slave address only This limits addressing to a single device at the port 12 Modbus to Ethernet Bridge Figure 3 shows an example of message address mapping between a Modbus Master and a Modbus Slave using two Bridges with an Ethernet link Figure 3 Mapping Modbus and IP Addresses Modbus message to Sl
37. the DIN rail 2 Snap the Bridge into place on the lower edge of the rail Figure 5 Mounting the Bridge on the DIN Rail NNNNNNNNNNNNNNNNN NN NN Mounting Completed 20 Installing the Bridge Hardware 2 2 Connecting the Power Wiring Figure 6 shows the connections for operating power and ground Operating power must be fused externally to the Bridge The Bridge draws 3W maximum 9 30 V dc Select a fuse value according to the supply voltage Figure 6 Connecting the Power Wiring Safety Ground Earth 21 Installing the Bridge Hardware 23 Connecting the Serial Cable RJ45 Port Figure 7 shows serial cable connections for several Modicon CPUs for operation as Modbus Master or Slave devices The figure also shows a typical connection to a standard PC 9 pin serial port for setting up the Bridge configuration Table 8 lists other compatible devices and cables Figure 7 Connecting the Serial Cable RJ45 Port Modbus Port RJ45 A984 E984 26x 27x 28x E984 24x 25x 984 38x 48x 68x 78x RJ45 to RJ45 Cables 110 XCA 282 01 3 ft 1 m 110 XCA 282 02 10 ft 3 m 110 XCA 282 03 20 ft 6 m A RJ45 to DB9 Adapters 110 XCA 203 01 Kit a PC with 2 Serial Port 110 XCA 203 00 Pre wired a 22 Installing the Bridge
38. the Modbus port Indicators show the status of communication at the Ethernet and Modbus ports The Bridge contains a configuraton utility program stored in its non volatile memory With this utility you can assign the Bridge s Ethernet and Modbus parameters using an ASCII terminal at the serial port or a Telnet connection over Ethernet The Bridge contains a factory assigned MAC address that is derived from the serial number printed on the Bridge s label This allows you to establish an Ethernet connection to the Bridge to assign its IP address and the other parameters for your application 11 Modbus to Ethernet Bridge 1 2 1 2 1 1 2 2 Mapping Modbus and IP Addresses The Bridge maps messages between Modbus and IP addresses according to the type of device you have configured at its Modbus port Mapping for a Modbus Master When you configure a Modbus Master device at the Bridge s serial port you can assign up to eight entries into an internal mapping table that is maintained in the Bridge s memory You enter your intended mapping into the table during your configuration of the Bridge Each table entry maps a single Modbus address or a range of addresses to a destination IP address When the Bridge receives a message from the Master it searches the mapping table for an entry matching the Modbus address in the message If one is found the Bridge sends the message to the IP address for that entry If a ma
39. you will be restarting it on the network This will disrupt communication with the Bridge Ensure that this action will not cause any undesirable effect on your application Failure to observe this precaution can result in injury or equipment damage Warning DUPLICATE ADDRESS HAZARD Having two or more devices with the same IP address can cause unpredictable operation of your network Ensure that you will be assigning a unique IP address to the Bridge Failure to observe this precaution can result in injury or equipment damage 30 Configuring the Bridge 3 2 Connecting by the RS 232 Port To configure the Bridge at its local RS 232 port use a serial terminal emulation program and a modem cable See Figure 7 for a connection example Regardless of any serial parameters currently set into the Bridge for a user application it will always use the following parameters for setup 9600 baud 8 data bits No parity 1 Stop bit 9600 8 N 1 Set your emulator to these parameters Figure 13 Example RS 232 Serial Terminal Emulator Properties Banners Dit pai second 9600 8 Es None gt Blow ar Hardware Force the Bridge into its Configuration mode as follows m Ensure the emulator is connected to the Bridge s serial port and ready m Hold down the X key on your emulator keyboard While holding the key down initialize the Bridge by cycling its power
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