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NOVUS AUTOMATION 1/16

MODBUS COMMUNICATION MANUAL

INTRODUCTION

FieldLogger has many communication interfaces. Among all of them, we can highlight some that can be used as

Modbus slaves:

RS485, acting as a slave in Modbus RTU protocol.

USB device, acting as a slave in Modbus RTU protocol.

Ethernet, acting as a server in Modbus TCP protocol.

All device configurations, as well as the input channels reading, are made through Modbus protocol.

In this manual, all needed information to read FieldLogger’s input channels data without using the Configurator

application can be found. In order to assure the correct configuration and data download, always use the indicated

software applications. After configuring the equipment, data obtained from its inputs and outputs can be reached by any

other software application that has Modbus RTU or Modbus TCP communication abilities.

Further details about the implementation of a network of Modbus devices over RS485 can be found in the RS485 &

RS422 Basics file, available in the FieldLogger CD or in the www.novusautomation.com website for download.

MODBUS COMMANDS

The following listed Modbus commands (or functions) are implemented. In order to get more information about each one

and about Modbus protocol in general, check the website:

http://www.modbus.org

READ HOLDING REGISTERS – 03H

This command can be used to read one or more holding registers, as listed in a table in the next chapter.

WRITE SINGLE COIL – 05H

This command can be used to write in digital output or relay. First coil refers to digital output 1. Ninth and tenth coils refer

to relays 1 and 2.

Important Note: It is not possible to write in a digital channel that was configured as an input. It is also not possible to

write in a digital output or relay that was configured to be controlled by alarms (internal FieldLogger alarms).

WRITE SINGLE REGISTER – 06H

This command can be used to write in one holding register, as listed in a table in the next chapter.

WRITE MULTIPLE REGISTERS – 16H

This command can be used to write in a block of holding registers, as listed in a table in the next chapter.

HOLDING REGISTERS TABLE

The specified addresses are related to the low-level phisical addresses, where zero (0) means the PLC address 40001.

Minimum and Maximum columns have the valid range for each parameter. R/W column indicates whether the parameter

is writable (R/W) or read-only (R). SuperView Mnemonic informs what is the register mnemonic in the SuperView

SCADA software.

Address

Description

Minimum

Maximum

R/W

SuperView

Mnemonic

Serial number (word high)

65535

SerialNumber_H

Serial number (word low)

65535

SerialNumber_L

Firmware version

999

FirmwareVersion

Analog channel 1 value (signed 16-bit integer)

-32768

32767

Analog_1_Int

Analog channel 2 value (signed 16-bit integer)

-32768

32767

Analog_2_Int

Analog channel 3 value (signed 16-bit integer)

-32768

32767

Analog_3_Int

Analog channel 4 value (signed 16-bit integer)

-32768

32767

Analog_4_Int

Analog channel 5 value (signed 16-bit integer)

-32768

32767

Analog_5_Int

Analog channel 6 value (signed 16-bit integer)

-32768

32767

Analog_6_Int

Analog channel 7 value (signed 16-bit integer)

-32768

32767

Analog_7_Int

1 2 3 4 5 6 ... 15 16

Inhaltsverzeichnis

Seite 1 - MODBUS COMMUNICATION MANUAL

NOVUS AUTOMATION 1/16 MODBUS COMMUNICATION MANUAL INTRODUCTION FieldLogger has many communication interfaces. Among all of them, we can

Seite 2 - NOVUS AUTOMATION 2/16

NOVUS AUTOMATION 10/16 Address Description Minimum Maximum R/W SuperView Mnemonic 427 Virtual channel 22 value (floating point – word low) 428 Virtu

Seite 3

NOVUS AUTOMATION 11/16 Address Description Minimum Maximum R/W SuperView Mnemonic 479 Virtual channel 48 value (floating point – word low) 480 Virtu

Seite 4 - NOVUS AUTOMATION 4/16

NOVUS AUTOMATION 12/16 Address Description Minimum Maximum R/W SuperView Mnemonic 531 Virtual channel 74 value (floating point – word low) 532 Virtu

Seite 5

NOVUS AUTOMATION 13/16 Address Description Minimum Maximum R/W SuperView Mnemonic 583 Virtual channel 100 value (floating point – word low) 584 Virt

Seite 6

NOVUS AUTOMATION 14/16 Address Description Minimum Maximum R/W SuperView Mnemonic 635 Virtual channel 126 value (floating point – word low) 636 Virt

Seite 7

NOVUS AUTOMATION 15/16 Address Description Minimum Maximum R/W SuperView Mnemonic 5307 Alarm 09 Setpoint (floating point – word high) -3.4e+38 +3.4e

Seite 8

NOVUS AUTOMATION 16/16 REGISTER 2 – FIRMWARE VERSION Indicates the device firmware version, as it is shown in the examples: If the version is “1.00”

Seite 9

NOVUS AUTOMATION 2/16 Address Description Minimum Maximum R/W SuperView Mnemonic 10 Analog channel 8 value (signed 16-bit integer) -32768 32767 R An

Seite 10

NOVUS AUTOMATION 3/16 Address Description Minimum Maximum R/W SuperView Mnemonic 63 Remote channel 32 value (signed 16-bit integer) -32768 32767 R R

Seite 11

NOVUS AUTOMATION 4/16 Address Description Minimum Maximum R/W SuperView Mnemonic 115 Virtual channel 20 value (signed 16-bit integer) -32768 32767 R

Seite 12

NOVUS AUTOMATION 5/16 Address Description Minimum Maximum R/W SuperView Mnemonic 167 Virtual channel 72 value (signed 16-bit integer) -32768 32767 R

Seite 13

NOVUS AUTOMATION 6/16 Address Description Minimum Maximum R/W SuperView Mnemonic 219 Virtual channel 124 value (signed 16-bit integer) -32768 32767

Seite 14

NOVUS AUTOMATION 7/16 Address Description Minimum Maximum R/W SuperView Mnemonic 271 Remote channel 8 value (floating point – word low) 272 Remote c

Seite 15 - DETAILS ABOUT SOME REGISTERS

NOVUS AUTOMATION 8/16 Address Description Minimum Maximum R/W SuperView Mnemonic 323 Remote channel 34 value (floating point – word low) 324 Remote

Seite 16 - FLOATING POINT FORMAT USED

NOVUS AUTOMATION 9/16 Address Description Minimum Maximum R/W SuperView Mnemonic 375 Remote channel 60 value (floating point – word low) 376 Remote

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