NOVUS Web Server – WS10 - Manual (Page 2)

Web Server – WS10
NOVUS AUTOMATION 2/33
BASIC FUNCTIONS
The WS10 Web Server by Novus is an equipment capable of acquiring and delivering data using the internet technologies. Local and remote
systems supervision, alarm notification and data logging are easy to configure and operate, with no dedicated software.
DATA ACQUISITION
The WS10 gets data from the system or process through:
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4 built-in signal inputs
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RS232 or RS485 serial communication interface
Data acquisition over the RS485 communication interface uses the Modbus RTU protocol. The WS10 acts as a master, polling the Modbus network
nodes to get the specified data to its memory.
All the data acquired from its local inputs and from external Modbus devices are stored on the WS10 memory. The user can assign identifiers for
each memory position. On the configurations of the data access functions, all registers are referenced by their names.
REGISTERS
Registers are memory locations in the WS10 that contain:
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Instantaneous input or output values read or written to the WS10 built-in signal inputs.
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Instantaneous values, read from or written to, the equipments connected to the Modbus RTU network.;
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Instantaneous memory values, used to control WS10´s functions, not directly connected to the physical inputs or outputs;
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The instantaneous values corresponding to the current alarms situation.
Each register has an identifier composed by a Device Name and a Tag Name. This identifier is used as a reference to the register when configuring
the WS10 functions:
DeviceName/Tag
Register
For registers access using ModbusTCP and ModbusRTU-Slave, numerical addresses must be assigned to the registers. These addresses may be
defined in file MAP.CFG, described on chapter ModbusTCP.
DATA LOGGING
The WS10 can be configures to periodically log the values of a group of registers on its Flash memory. This historical logging can be sent out by e-
mail or directly to a computer. This function allows the WS10 to act as a Data Logger for the variables read from the equipments in the Modbus
network or from its built-in signal inputs. On a remote supervision system, this function enables the WS10 to monitor the process and send the
acquired data periodically or when the communication link is established.
REMOTE DATA ACCESS
The instantaneous and historical values acquired from the system or process can be accessed by different physical ways:
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Ethernet interface;
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RS232, RS485 serial interface or Modem (conventional or mobile).
The WS10 offers five basic applications for remote data access of its registers.
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WebServer;
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Modbus TCP or Modbus RTU;
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Alarm conditions supervision;
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E-mail transmission;
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Periodical data transmission.
The WS10´s multi-task operating system allows for the simultaneous utilization of all these applications
HTML PAGE SERVER APPLICATION
In this application, the WS10 presents the acquired data of the process in dynamic user-created HTML pages, that can be visualized by any
computer using a Internet browser (Netscape, Internet Explorer, etc).
The WS10, connected to the company’s intranet by its Ethernet interface, shares the information (application data) to any computer connected to
the intranet, allowing both readings and writings of data, with or without password authorization.
In a remote application, a WS10 connected to a conventional or mobile modem can answer a "dial-up" call connection and present a supervision
page to the internet browser of the computer that originated the call, allowing the supervision of remote units.
MODBUS TCP
The WS10 can be configured as a ModbusTCP server and gateway, enabling integration to SCADA supervisory systems. As a server, WS10
accepts connections from multiple SCADA clients, allowing read and write access to its internal registers. This registers are associated to WS10’s
local I/O, memory positions or external ModbusRTU devices. As a gateway, WS10 forwards messages between ModbusTCP and ModbusRTU
networks, acting as a protocol converter. Both modes may be used simultaneously, while all other WS10 functions remain fully functional.
ModbusTCP communication can be used over Ethernet or phone line (fixed or mobile).