F-3100 FLOW METER NETWORK INTERFACE Installation and Operation Guide

Transcription

1 MODBUS FLOW AND ENERGY MEASUREMENT F-3100 FLOW METER NETWORK INTERFACE Installation and Operation Guide Belcher Road South, Largo, FL USA Tel +1 (727) Fax +1 (727)

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3 TABLE OF CONTENTS 1.0 INTRODUCTION PURPOSE OF THIS GUIDE TYPICAL F-3100 INSTALLATION SPECIFICATIONS DISPLAY AND USER INTERFACE NETWORK SIGNAL CONNECTIONS RS485 BAUD RATE, BIASING AND TERMINATION Baud rate and parity Entering the Program Mode Biasing and Termination MODBUS MEMORY MAP MODBUS REGISTER FORMAT AND NETWORKING INFORMATION NETWORK TROUBLESHOOTING TIPS TROUBLESHOOTING...12 F-3100-MOD Flow Meter Network Interface Installation Guide 09/ Page 3

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5 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 flow meter that measures liquid flow, provides a local indication of the flow 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: (Default: 017) Baud rate: 4800, 9600, or (Default: 9600) Termination: None Biasing: None F-3100-MOD Flow Meter Network Interface Installation Guide 09/ Page 5

6 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. Briefly 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. F-3100-MOD Flow Meter Network Interface Installation Guide 09/ Page 6

7 1.5 NETWORK SIGNAL CONNECTIONS 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 Incoming cable Black Red 1.6 RS485 BAUD RATE, BIASING AND TERMINATION Baud Rate and Parity Every ONICON F-3100 is individually programmed at the factory with application specific 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 configured 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, and The available parity settings are odd, even or none. The network address can be from 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. i Entering The Program Mode: IMPORTANT NOTE The meter will automatically exit the program after 60 seconds of no activity. Briefly press enter. The display will change to keycode L2:00000 with the cursor flashing 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 Briefly press enter. The MAIN MENU page will appear with sub-menu 1 Sensor shown as the selected option. F-3100-MOD Flow Meter Network Interface Installation Guide 09/ Page 7

8 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. Briefly press the right arrow 6 times to advance to sub-menu 7-Communication. 2 Briefly press the enter key to enter the 7-Communication sub-menu. 3 Briefly press the right arrow once to advance to the address function. 4 Briefly press the enter key once to enter the address function. 5 Use the up arrow key to change the value of the leftmost digit. Once the correct value is indicated, use the right arrow to move the cursor to the right. Repeat the process as necessary until the correct address is entered. 6 Briefly press enter once to exit the address function. To exit the program mode at this point, long press enter twice. 7 Briefly press the right arrow once to advance to the Baud rate function. 8 Briefly press enter once to enter the Baud rate function. 9 Use the up arrow to change the Baud rate to the correct setting. 10 Briefly press enter once to exit the Baud rate function. To exit the program mode at this point, long press enter twice. 11 Briefly press the right arrow 3 times to advance to the Parity funciton. 12 Briefly press enter once to enter the parity function. 13 Use the up arrow to change the parity to the correct setting. 14 Briefly press enter once to exit the parity function. 15 Long press enter once to return to the MAIN MENU. 16 Long press enter once to exit the program mode. The display function shown will be IF2 prot=. The displayed function shown will be Address=. The flashing cursor will move from the A in adress to the leftmost digit of the address number. The valid range for the address is from The flashing cursor will move from its current position to immediately below the A in address. The displayed function shown will be RS485 bps: The flashing cursor will move from the R in RS485 to the position right of the colon. The flashing cursor will move from the position right of the colon to immediately below the R in RS485. The displayed function shown will be Parity=. The flashing cursor will move from the P in Parity to the position right of the colon. The flashing cursor will move from the position right of the colon to immediately below the P in Parity. Sub-menu 7-Communication will be selected. F-3100-MOD Flow Meter Network Interface Installation Guide 09/ Page 8

9 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 Ohm Incoming cable Leave shield unterminated Black Red F-3100-MOD Flow Meter Network Interface Installation Guide 09/ Page 9

10 SECTION 2.0: MODBUS MEMORY MAP ONICON F-3100 Inline Electromagnetic Flow Meters provide flow rate data, totalized flow 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 Description Register Type Comment 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 flow rate Floating Point (1 of 2) 004 Current flow rate Floating Point (2 of 2) 005 Positive flow total Scaled Long Integer (1 of 2) Register values must be 006 Positive flow total Scaled Long Integer (2 of 2) scaled according to the number of decimal points 007 Partial positive flow total Scaled Long Integer (1 of 2) shown on the flow meter 008 Partial positive flow total Scaled Long Integer (2 of 2) display. 009 Negative flow total Scaled Long Integer (1 of 2) Example: Displayed value Negative flow total Scaled Long Integer (2 of 2) Register value Partial negative flow total Scaled Long Integer (1 of 2) Scale multiplier Partial negative flow 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) F-3100-MOD Flow Meter Network Interface Installation Guide 09/ Page 10

11 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 flow alarm is active 002 Minimum flow 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 flow range active 009 Flow rate below low flow cut-off Check low flow 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 F-3100-MOD Flow Meter Network Interface Installation Guide 09/ Page 11

12 3.1 TROUBLESHOOTING SECTION 3: NETWORK TROUBLESHOOTING TIPS REPORTED PROBLEM Device will not communicate with the network controller. POSSIBLE SOLUTIONS 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 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 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 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. 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 of this manual for details.) Network communications are disrupted when the device is connected. 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 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 F-3100-MOD Flow Meter Network Interface Installation Guide 09/ Page 12