ONICON F-3100 User Manual

MODBUS

F-3100 FLOW METER NETWORK INTERFACE

Installation and Operation Guide

11451 Belcher Road South, Largo, FL 33773 • USA • Tel [phone] • Fax [phone]

www.onicon.com • [e-mail]

05-140725-1

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F-3100-MOD Flow Meter Network Interface Installation Guide 05/14 - 0725-1 Page 2

TABLE OF CONTENTS

1.0 INTRODUCTION ..................................................................................................5

1.1 PURPOSE OF THIS GUIDE .......................................................................5

1.2 TYPICAL F-3100 INSTALLATION ............................................................5

1.3 SPECIFICATIONS ......................................................................................5

1.4 DISPLAY AND USER INTERFACE ...........................................................6

1.5 NETWORK SIGNAL CONNECTIONS .......................................................7

1.6 RS485 BAUD RATE, BIASING AND TERMINATION .............................. 7

1.6.1 Baud rate and parity ....................................................................... 7

1.6.1.1 Entering the Program Mode ............................................... 7

1.6.2 Biasing and Termination.................................................................9

2.0 MODBUS MEMORY MAP ..................................................................................10

2.1 MODBUS REGISTER FORMAT AND

NETWORKING INFORMATION .............................................................10

3.0 NETWORK TROUBLESHOOTING TIPS ...........................................................12

3.1 TROUBLESHOOTING .............................................................................12

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SECTION 1: INTRODUCTION

1.1 PURPOSE OF THIS GUIDE

The purpose of this guide is to provide installation and basic operating and servicing instructions
for the ONICON F-3100 Flow Meter MODBUS RTU serial interface.

1.2 TYPICAL F-3100 INSTALLATION

The F-3100 is an inline electromagnetic ow meter that measures liquid ow, provides a local
indication of the ow rate and total, and provides this data via a MODBUS RTU RS485 serial
interface to the utility or building control network.

INSTALLATION IN STEEL (CONDUCTIVE) PIPE

Flow Direction

1.3 SPECIFICATIONS

MODBUS RTU NETWORK INTERFACE

RS485

Transceiver: 2-wire, half-duplex
Data format: 8 bit with 1 stop bit
Parity: Even, none or odd (default: even)
MAC address (device address) range: 1 - 247 (Default: 017)
Baud rate: 4800, 9600, 19200 or 38400 (Default: 9600)
Termination: None
Biasing: None

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1.4 DISPLAY AND USER INTERFACE

The F-3100 transmitter is equipped with a 2-line by 16-character LCD with 0.2” high characters.
Three pushbutton switches located inside the transmitter enclosure are used to change the data
that is displayed and to program the meter functions. To access the pushbuttons, loosen the 4
cover screws and open the cover as shown below.

Momentarily press the UP (top) button to view alarm
messages.

Momentarily press the RIGHT (middle) button to advance
to the next menu page.

The ENTER (bottom) button is used in programming.

In the program mode the function of each pushbutton switch changes depending on how long the
switch is pressed. Briey pressing the switch causes one action while pressing the same switch
for a longer duration causes the reverse of that action. Each program mode switch function is
detailed below.

Up Arrow:

When in the main menu, a brief press selects the previous option, and a long press selects the
next option. In all other program levels, a brief press increments the number or selects the next
option, and a long press decrements the number or selects the previous option.

Right Arrow:

When in the main menu, a brief press selects the next option, and a long press selects the
previous option. In all other program levels, a brief press moves the cursor to the right or selects
the previous option, and a long press moves the cursor to the left or selects the next option.

Enter:

When in the main menu, a brief press enters the selected sub-menu, and a long press exits the
program mode. Within the sub-menus, a brief press enters or leaves the selected function. It also
cancels the selected function in progress. A long press enables the “EXECUTE” prompt in certain
functions such as reset total. A long press also accepts the change and exits the function.

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1.5 NETWORK SIGNAL CONNECTIONS

i

MODBUS RS485, 2-wire (half-duplex) serial output connections are made at terminals 7 and 8 as
shown below. Incoming and outgoing RS485 cable shield wires should be connected together, but
must not be connected to the meter.

Shields

Outgoing cable

+

-

Black

1.6 RS485 BAUD RATE, BIASING AND TERMINATION

1.6.1 Baud Rate and Parity

Every ONICON F-3100 is individually programmed at the factory with application specic
data provided by the customer during the process of ordering the meter. This normally
includes the Baud rate, parity and network address settings. If the information was
provided, the meter will be congured to the appropriate settings. If this information was
not provided, the meter default settings are:

Baud rate: 9600 Parity: Even Network Address: 017

The available Baud rate settings are 4800, 9600, 19200 and 38400. The available parity
settings are odd, even or none. The network address can be from 1 – 247. The Baud rate,
parity and address settings can be changed via the user interface/display on the front of
the meter. The information below details the process of entering the program mode and
changing the address, baud rate and parity settings.

1.6.1.1 Entering The Program Mode:

8

Incoming cable

7

Red

IMPORTANT NOTE

The meter will automatically exit the program after 60 seconds of no activity.

Briey press enter. The display will change to “keycode L2:00000” with the cursor
ashing under the leftmost digit. Using the up arrow key to increment the digits and
the right arrow key to move the cursor, enter a code of 11111. Briey press enter. The
MAIN MENU page will appear with sub-menu 1–Sensor shown as the selected option.

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Changing Address, Baud Rate & Parity

STEP ACTION COMMENT

0 Obtain the baud rate, parity and device address

settings from the network administrator.

1 The MAIN MENU page shows sub-menu

1-Sensor. Briey press the right arrow 6 times
to advance to sub-menu 7-Communication.

2 Briey press the enter key to enter the

7-Communication sub-menu.

3 Briey press the right arrow once to advance to

the address function.

4 Briey press the enter key once to enter the

address function.

The display function shown will be
IF2 prot=.

The displayed function shown will be
Address=.

The ashing cursor will move from the
A in adress to the leftmost digit of the
address number.

5 Use the up arrow key to change the value of

the leftmost digit. Once the correct value is

The valid range for the address is from

1 - 247.
indicated, use the right arrow to move the
cursor to the right. Repeat the process as
necessary until the correct address is entered.

6 Briey press enter once to exit the address

function.

The ashing cursor will move from its

current position to immediately below

the A in address.

To exit the program mode at this point, long press enter twice.
7 Briey press the right arrow once to advance to

the Baud rate function.

8 Briey press enter once to enter the Baud rate

function.

The displayed function shown will be

RS485 bps:

The ashing cursor will move from the

R in RS485 to the position right of the

colon.

9 Use the up arrow to change the Baud rate to the

correct setting.

10 Briey press enter once to exit the Baud rate

function.

The ashing cursor will move from

the position right of the colon to

immediately below the R in RS485.

To exit the program mode at this point, long press enter twice.
11 Briey press the right arrow 3 times to advance

to the Parity funciton.

12 Briey press enter once to enter the parity

function.

The displayed function shown will be

Parity=.

The ashing cursor will move from the P

in Parity to the position right of the colon.

13 Use the up arrow to change the parity to the

correct setting.

14 Briey press enter once to exit the parity

function.

The ashing cursor will move from

the position right of the colon to

immediately below the P in Parity.

15 Long press enter once to return to the MAIN

MENU.

Sub-menu 7-Communication will be

selected.

16 Long press enter once to exit the program mode.

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1.6.2 Biasing and Termination

The ONICON F-3100 does not provide biasing voltage to the RS485 network. An external
120Ω resistor (not provided) should be connected across the terminals as shown below
when the meter is installed at the end of the line.

120 Ohm

+

8

Incoming cable

7

-

Leave shield
unterminated

Black

Red

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F-3100-MOD Flow Meter Network Interface Installation Guide 05/14 - 0725-1 Page 9

SECTION 2.0: MODBUS MEMORY MAP

ONICON F-3100 Inline Electromagnetic Flow Meters provide ow rate data, totalized ow data, and
operating status data via the MODBUS RTU RS485 serial communications interface. MODBUS data is
available in the same engineering units shown on the meter’s display.

2.1 MODBUS REGISTER FORMAT AND NETWORKING INFORMATION

All registers are 16 bit MODBUS Holding Registers.
Only one MODBUS function code is supported. It is function code 3, reading holding registers.
Floating point data conforms to IEEE754 format.
Long integer (32-bit) data is formatted with the high order word (MSW) on the even addrss and
the low order word (LSW) on the odd address.

Register

Address
001 Flow rate as a % of full scale Floating Point (1 of 2)
002 Flow rate as a % of full scale Floating Point (2 of 2)
003 Current ow rate Floating Point (1 of 2)
004 Current ow rate Floating Point (2 of 2)
005 Positive ow total Scaled Long Integer (1 of 2) Register values must be
006 Positive ow total Scaled Long Integer (2 of 2)
007 Partial positive ow total Scaled Long Integer (1 of 2)
008 Partial positive ow total Scaled Long Integer (2 of 2)
009 Negative ow total Scaled Long Integer (1 of 2)
010 Negative ow total Scaled Long Integer (2 of 2)
011 Partial negative ow total Scaled Long Integer (1 of 2)
012 Partial negative ow total Scaled Long Integer (2 of 2)
013 Run time clock in seconds Long Integer (1 of 2)
014 Run time clock in seconds Long Integer (2 of 2)

Description Register Type Comment

scaled according to the
number of decimal points
shown on the ow meter
display.
Example:
Displayed value - 226.794
Register value - 226794
Scale multiplier - 0.001

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Flow Meter Operating Status Register (Address 35)

Bit# Description Comment

000 Coil pulse rate too fast for coil diameter Check for programming error for coil diamter

and/or sample rate.
001 Maximum ow alarm is active
002 Minimum ow alarm is active
003 Flow rate exceeds full scale value Change full scale setting
004 Not used
005 Noisy or open elctrode signal Check wiring
006 Empty pipe
007 Coil open or disconnected Check wiring
008 Alternate ow range active
009 Flow rate below low ow cut-off Check low ow cut-off setting
010 Flow in the negative direction
011 Not used
012 Not used
013 Not used
014 Calibration cycle in progress
015 Flow simulation mode active

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SECTION 3: NETWORK TROUBLESHOOTING TIPS

3.1 TROUBLESHOOTING

REPORTED PROBLEM POSSIBLE SOLUTIONS

Device will not communicate
with the network controller.

• A unique address is required for each device on the network.
Duplicate addresses will cause some or all of the devices on
the network to quit working. (See section 1.6.1 of this manual
for details.)

• The RS485 network cable connections are polarity sensitive
and must be connected the same way on every device (i.e. +
to + and - to -). (See section 1.5 of this manual for details.)

• The Baud rate setting must match the network Baud rate. (See
section 1.6.1 of this manual for details.)

• Shield drain connections should be daisy chained in the
same manner as the signal cables for RS485. The shield drain
wire should be left unterminated at the end of the cable and
connected to earth only at the network master controller.
Shield wires must not be connected to the the F-3100.

• The maximum number of devices allowed on a RS485
network segment without a repeater is 32. Adding more than
32 devices to a single segment may reduce the transceiver
output voltage to a level that is too low to be distinguished
from background noise on the cable.

Network communications are
disrupted when the device is
connected.

• RS485 cable impedance should be matched to a termination
resistor at the end of the cable. This resistor should only be
used if the meter is the last device on the network cable. (See
section 1.6.2 of this manual for details.)

• The RS485 network cable connections are polarity sensitive
and must be connected the same way on every device (i.e. +
to + and - to -). (See section 1.5 of this manual for details.)

• A unique address is required for each device on the network.
Duplicate addresses will cause some or all of the devices on
the network to quit working. (See section 1.6.1 of this manual
for details.)

• Shield drain connections should be daisy chained in the
same manner as the signal cables for RS485. The shield drain
wire should be left unterminated at the end of the cable and
connected to earth only at the network master controller.
Shield wires must not be connected to the F-3100.

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