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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

Summary of content (16 pages)

PAGE 1
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.
PAGE 2
Address Description Minimum Maximum R/W SuperView Mnemonic 10 Analog channel 8 value (signed 16-bit integer) -32768 32767 R Analog_8_Int 13 Bit array with the state of each digital I/O (bit 0: digital channel 1, bit 2: digital channel 2, etc.
PAGE 3
Address Description Minimum Maximum R/W SuperView Mnemonic 63 Remote channel 32 value (signed 16-bit integer) -32768 32767 R Remote_32_Int 64 Remote channel 33 value (signed 16-bit integer) -32768 32767 R Remote_33_Int 65 Remote channel 34 value (signed 16-bit integer) -32768 32767 R Remote_34_Int 66 Remote channel 35 value (signed 16-bit integer) -32768 32767 R Remote_35_Int 67 Remote channel 36 value (signed 16-bit integer) -32768 32767 R Remote_36_Int 68 Remote channe
PAGE 4
115 Virtual channel 20 value (signed 16-bit integer) -32768 32767 R SuperView Mnemonic Virtual_020_Int 116 Virtual channel 21 value (signed 16-bit integer) -32768 32767 R Virtual_021_Int 117 Virtual channel 22 value (signed 16-bit integer) -32768 32767 R Virtual_022_Int 118 Virtual channel 23 value (signed 16-bit integer) -32768 32767 R Virtual_023_Int 119 Virtual channel 24 value (signed 16-bit integer) -32768 32767 R Virtual_024_Int 120 Virtual channel 25 value (signed 16-bi
PAGE 5
167 Virtual channel 72 value (signed 16-bit integer) -32768 32767 R SuperView Mnemonic Virtual_072_Int 168 Virtual channel 73 value (signed 16-bit integer) -32768 32767 R Virtual_073_Int 169 Virtual channel 74 value (signed 16-bit integer) -32768 32767 R Virtual_074_Int 170 Virtual channel 75 value (signed 16-bit integer) -32768 32767 R Virtual_075_Int 171 Virtual channel 76 value (signed 16-bit integer) -32768 32767 R Virtual_076_Int 172 Virtual channel 77 value (signed 16-bi
PAGE 6
219 Virtual channel 124 value (signed 16-bit integer) -32768 32767 R SuperView Mnemonic Virtual_124_Int 220 Virtual channel 125 value (signed 16-bit integer) -32768 32767 R Virtual_125_Int 221 Virtual channel 126 value (signed 16-bit integer) -32768 32767 R Virtual_126_Int 222 Virtual channel 127 value (signed 16-bit integer) -32768 32767 R Virtual_127_Int 223 Virtual channel 128 value (signed 16-bit integer) -32768 32767 R Virtual_128_Int 224 Analog channel 1 value (floating
PAGE 7
Address Description 271 Remote channel 8 value (floating point – word low) 272 Remote channel 9 value (floating point – word high) 273 Remote channel 9 value (floating point – word low) 274 Remote channel 10 value (floating point – word high) 275 Remote channel 10 value (floating point – word low) 276 Remote channel 11 value (floating point – word high) 277 Remote channel 11 value (floating point – word low) 278 Remote channel 12 value (floating point – word high) 279 Remote channel 12 va
PAGE 8
Address Description 323 Remote channel 34 value (floating point – word low) 324 Remote channel 35 value (floating point – word high) 325 Remote channel 35 value (floating point – word low) 326 Remote channel 36 value (floating point – word high) 327 Remote channel 36 value (floating point – word low) 328 Remote channel 37 value (floating point – word high) 329 Remote channel 37 value (floating point – word low) 330 Remote channel 38 value (floating point – word high) 331 Remote channel 38
PAGE 9
Address Description 375 Remote channel 60 value (floating point – word low) 376 Remote channel 61 value (floating point – word high) 377 Remote channel 61 value (floating point – word low) 378 Remote channel 62 value (floating point – word high) 379 Remote channel 62 value (floating point – word low) 380 Remote channel 63 value (floating point – word high) 381 Remote channel 63 value (floating point – word low) 382 Remote channel 64 value (floating point – word high) 383 Remote channel 64
PAGE 10
Address Description 427 Virtual channel 22 value (floating point – word low) 428 Virtual channel 23 value (floating point – word high) 429 Virtual channel 23 value (floating point – word low) 430 Virtual channel 24 value (floating point – word high) 431 Virtual channel 24 value (floating point – word low) 432 Virtual channel 25 value (floating point – word high) 433 Virtual channel 25 value (floating point – word low) 434 Virtual channel 26 value (floating point – word high) 435 Virtual c
PAGE 11
Address Description 479 Virtual channel 48 value (floating point – word low) 480 Virtual channel 49 value (floating point – word high) 481 Virtual channel 49 value (floating point – word low) 482 Virtual channel 50 value (floating point – word high) 483 Virtual channel 50 value (floating point – word low) 484 Virtual channel 51 value (floating point – word high) 485 Virtual channel 51 value (floating point – word low) 486 Virtual channel 52 value (floating point – word high) 487 Virtual c
PAGE 12
Address Description 531 Virtual channel 74 value (floating point – word low) 532 Virtual channel 75 value (floating point – word high) 533 Virtual channel 75 value (floating point – word low) 534 Virtual channel 76 value (floating point – word high) 535 Virtual channel 76 value (floating point – word low) 536 Virtual channel 77 value (floating point – word high) 537 Virtual channel 77 value (floating point – word low) 538 Virtual channel 78 value (floating point – word high) 539 Virtual c
PAGE 13
Address Description 583 Virtual channel 100 value (floating point – word low) 584 Virtual channel 101 value (floating point – word high) 585 Virtual channel 101 value (floating point – word low) 586 Virtual channel 102 value (floating point – word high) 587 Virtual channel 102 value (floating point – word low) 588 Virtual channel 103 value (floating point – word high) 589 Virtual channel 103 value (floating point – word low) 590 Virtual channel 104 value (floating point – word high) 591 V
PAGE 14
Address Description Minimum Maximum R/W SuperView Mnemonic -3.4e+38 +3.4e+38 R Virtual_127_Flt -3.4e+38 +3.
PAGE 15
Address Description Minimum Maximum R/W 5307 Alarm 09 Setpoint (floating point – word high) -3.4e+38 +3.4e+38 R/W 5314 Alarm 10 Setpoint (floating point – word high) -3.4e+38 +3.4e+38 R/W 5315 Alarm 10 Setpoint (floating point – word high) -3.4e+38 +3.4e+38 R/W 5322 Alarm 11 Setpoint (floating point – word high) -3.4e+38 +3.4e+38 R/W 5323 Alarm 11 Setpoint (floating point – word high) -3.4e+38 +3.4e+38 R/W 5330 Alarm 12 Setpoint (floating point – word high) -3.4e+38 +3.
PAGE 16
REGISTER 2 – FIRMWARE VERSION Indicates the device firmware version, as it is shown in the examples: If the version is “1.00”, value “100” will be read. If the version is “2.04”, value “204” will be read. REGISTERS 241 TO 255 – DIGITAL INPUT STATE FLOATING POINT VALUE Indicates the state of the digital input through the floating point value associated with the input channel by the user when configurating.