Device Master UP-Modbus
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Catalog excerpts

Device Master UP-Modbus - 1

Private Modbus Serial Bus Functionality via DeviceMaster® UP Modbus Router Security, visibility and extendibility are becoming increasingly important in today’s Modbus installations. Engineers are being asked to provide more visibility to Modbus installations and, at the same time, are also being asked to keep devices secure from unauthorized access and errant configuration changes. To make things more challenging, they are also being asked to do more with existing equipment. And let’s not forget the all-too-common limited budgets and tight schedules. So, how does one add a SCADA or HMI system to an existing Modbus network without compromising the security of existing Modbus devices? How does one design a Modbus installation that limits control of Modbus slave devices to a single Modbus master and yet can provide status information from those same device(s)? How does one add additional equipment quickly, easily and economically? And how does one maintain such an installation once it is operational? That is not easy – unless if you have a DeviceMaster UP running Modbus Router. At Comtrol, we are constantly looking for innovative ways to help solve such challenges. Unique and extensive functionally designed to solve the most difficult problems with ease-of-use, robustness, and maintainability – that is what we are all about.

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Private Modbus Serial Bus Definition So, what exactly is a Private Modbus serial bus? A private Modbus serial bus is one that: 1. Contains both a Modbus master and one or more Modbus slaves on the same serial bus. 2. Allows only the Modbus master the ability to communicate directly to the Modbus slaves. 3. May provide access from the Modbus master to public Modbus network(s) via an advanced gateway, such as the DeviceMaster UP running Modbus Router firmware.

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Private Serial Bus Capabilities The Private Modbus serial bus functionality, combined with the many other Modbus Router features, provides powerful capabilities to aid plant engineers and system integrators. Provides Modbus Network Connectivity to Private Serial Bus Masters A serial Modbus master can communicate to slaves on its’ own private serial bus as well as public slaves and other Modbus masters on a Modbus network. The connectivity includes the following: • Modbus RTU/ASCII slave(s) on its own serial bus. • Public Modbus RTU/ASCII serial slave(s) connected to the same DeviceMaster...

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2.2 Provides Security for Private Modbus Slaves The Modbus slaves on the serial bus are “private” to the master on that serial bus. • The private slave device(s) are protected from all other Modbus masters on the Modbus network. • The private master has total control of communication to the slave(s) on its private serial bus. Ethernet Network Modbus RTU/ASC over Ethernet TCP,'IP cthemet TCP/IP Modbus RTU/ASCII Serial Master Public Serial Slaves Modbus Masters on network 0:JC cannot communicate to Server Private Slaves VFD Air Handler Boiler Modbus RTU/ASCII Master Public Connection Private...

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Deployment can be greatly simplified. • An existing serial bus can be left intact, thusly reducing the rewiring effort. • The only required wiring change is to attach the DeviceMaster UP to the serial bus anywhere there is access. Private Devices private serial bus wherever the bus is accessible. Ethernet Network The existing private serial bus can be left intact. Ethernet Network Connection Connecting to a Private Modbus Serial Bus Page 6

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2.4 Increased Fault Tolerance Implementing Private Serial bus(s) can increase a communication systems' fault-tolerance. 2.4.1 Private Serial Bus Loses Connection to DeviceMaster UP In the event the private serial bus is accidentally disconnected from the DeviceMaster UP or the DeviceMaster UP is accidentally powered off, the master and slaves on the private serial bus can still communicate to each other. Public Serial Slaves connection or power loss Modbus Master can still Modbus Connectivity Private Serial Bus with Lost Connection to DeviceMaster UP Note: If the Modbus master and all...

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In standard Modbus gateways, multiple Modbus masters communicating to Modbus slave device(s) can cause increased response latency and, in extreme cases, can cause the gateway to become congested. The main causes are: 1. Latency: By eliminating routing through the gateway, there is no added message latency between the master and private slave device(s). While routing Modbus messages through the DeviceMaster UP adds minimal latency, that latency can become more significant if other Modbus masters are attempting to read from the public device(s) at the same time. This is especially true when...

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Embedded web pages provide configuration, diagnostics and status of the Private Serial Bus(s). 2.5.1 Private Serial Bus Configuration The Serial Port Configuration page provides the interface to configure a serial port to connect to a Private Serial bus. Note: A serial connection can also be made with a 1-Port or 4-Port DeviceMaster UP.

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2.5.2 Display Known Slave Devices This page displays diagnostics for all known Modbus slaves including those on private serial bus(s).

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2.5.3 Display Serial Port Logs This page displays Modbus message activity for all serial ports including those attached to private serial bus(s).

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2.5.4 Display Serial Port Communications Page This page displays the serial port communication statistics for all ports including those connected to private serial bus(s).

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3 Examples of Common Installations Using Private Serial Bus(s) Private Serial bus connectivity can be used to solve many challenging installation requirements. The following examples display a few of the many ways that Private Serial Bus technology can be used to enhance and simplify installations. 3.1 Connecting Public Modbus Slaves to an Existing Modbus Serial Bus 3.1.1 Connect to Local Serial Slaves Requirements: • A serial Modbus master on an existing serial bus requires communication to serial Modbus devices that can be connected to the same gateway. Solution: • Use a 2-Port or 4-Port...

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