Modbus to DNP3 Protocol Converter
description
Transcript of Modbus to DNP3 Protocol Converter
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Modbus to DNP3 Protocol Converter
Group 24: Joshua Daly, CpE Daniel Doherty, CpE Mac Lightbourn , EEJoseph Wilkinson, EE
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Modbus vs. DNP3
Project motivation: MPE needs to allow for communication between network nodes that are using these different protocols.
Created Market Difficulty of Implementation
Equipment Costs
Open Standard?
Records time-stamped event
sequences?
Efficiency (bytes transferred for a given
bandwidth)
Modbus 1979 Widely used in all SCADA industries Low $100+ No With Difficulty Average
DNP3 1993
Sometimes used in water/
wastewater applications High $500-
$3000 Yes Yes Very High
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Four-Semester Plan
Device BuildUser InterfaceInitialization
Phase IINetwork CommunicationsSecurity
Phase I
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Key Specs Operates between -10 and 80 degrees Celsius Protects against surges of 120 V MCU clock has a backup battery that can power the
MCU for 12 hours if power is lost Sends alarm to master device when power is lost Takes Ethernet input and gives Ethernet output Allows user to view and change networking
parameters Logs 20,000 events, even when power is lost, with
98% fidelity Records date and time of each event to millisecond
accuracy Notifies master device of all events with 95% fidelity
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Four-Layer PCB Design
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Choosing an MCU
Microchip PIC32TI Stellaris ARM
Cortex M3Freescale
MC9S12NE64Freescale
MC9S12XDP512Price/unit
(bulk purchases) $1.58+ $1.00+ $6.93+ $13.07+
Pins 28, 36, or 44 64, 100, 144, or 156 80 or 112 80, 112, or 144
Processor Speed 80 MHz 80 MHz 16 MHz 80 MHz
Memory 128 KB SRAM256 KB SRAM, 32
KB Flash64 KB Flash, 8 K
RAM512 KB Flash, 64 KB
SRAM
Special Considerations
Cheap/free dev tools; extensive application notes
Ethernet-ready
Ethernet-ready with application notes; already widely used by
the sponsor
XGate coprocessor module; Non-
multiplexed external bus interface; in
same family as MCUs used by our sponsor
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ENC28J60 J00-0045NL
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Push Buttons and LEDs
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Firmware Overview
Menu system Allows user to adjust stored parameters Strict requirements from the sponsor
Creation of data Structs to maintain parameters
Initializing the device Handle all button functionality
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Coding Environments
Visual Studio Used while PCB board was in
development Familiar environment
Code Warrior Freescale MCU Optimization of .s19 file
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Data Storage
Stored in the EEPROM
Storage requirements Factory defined User defined
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Initializing the Device
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Buttons
Required Guidelines
Button Functionality
Menu Navigation
Time Delayed press
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Button Logic Flow Chart
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Screen
Display Screen 3 7-segement displays
Mimic the current display used by MPE
Allows user to visually navigate and set parameters
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Power Subsystem
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Power Supply Requirements
Takes in 24 V DC This supply is shared with other
components in the lift station control panel
This is a low voltage in comparison to other devices being used in industrial applications
The low voltage bypasses some of the testing requirements for meeting UL standards
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Power Supply Requirements
Surge Protection Must handle currents up to 80 mA Must correct irregular voltages Multiple devices are connected in
a shunt configuration for combined benefits
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Power Supply Requirements
Type of Device Lifetime-number ofsurges
Response Time
Transient Voltage Suppression Diode
- 1 ps
Metal Oxide Varistor 1000 surges 1 ns
Zener Diode infinite 1 us
Gas discharge tube 20 surges 5 us
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Input Surge Protection
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Power Supply Requirements
Must be fed through a DIN rail mount All devices in the lift station
control panel attach to one rail Mount also serves as chassis
ground for added surge protection
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DC/DC Converter
Voltage is stepped down to 3.3 V and then fed to the power plane
To conserve power, a passive switching regulator was chosen
Our configuration is a common circuit with extensive application notes
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Testing
Why do we test?
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Testing
Power Up The three 7-segment LEDs must synchronously
display each number for 100 (+/- 25) milliseconds from 0-9 in ascending order within 2 seconds after power up.
The menu scroll LED must illuminate for 1 (+/- 0.1) second within 2 seconds after power up.
The value change LED must illuminate for 1 (+/- 0.1) second within 2 seconds after power up.
The power LED must illuminate within 1 second after power up.
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Testing
Button Scroll When operating in menu scroll mode, the
three 7-segment LEDs must display the parameter number with the following format where XX is a parameter number between 00 and 99: P.XX.
The displayed parameter list must circle to the beginning of the list when cycled up at d.06
The displayed parameter list must circle to the end of the list when cycled down at E.01
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Testing
Sleep/Wake The user interface LEDs must not remain
illuminated if all user interface inputs are inactive for 120 (+/- 2) seconds.
When in a state of inactivity, the unit must transition to a state of activity
The state of user action must be preserved when the user interface LEDs are extinguished due to inactivity.
The state of user action must be reinstated when the unit returns from an inactive state.
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Challenges
How does it all work
Hardware challenges
Firmware challenges
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FinancialsComponent Price Quantity Total
Clock $2.34 4 $9.36Clock-Back Battery $4.28 1 $4.28Microcontroller $22.85 1 $22.85Switching Regulator $3.75 1 $3.75Schottky Diode $0.55 1 $0.55TVS Diode $0.73 1 $0.73Inductor $3.56 1 $3.56LCD Driver $1.75 1 $1.753-Digit 7-Segment Display $2.91 1 $2.91Ethernet Controller $5.83 2 $11.66Ethernet Connector $4.73 2 $9.46Super-Red LED $1.08 2 $2.16Metal Oxide Varistor $0.56 1 $0.56Din Rail Connector $1.54 1 $1.54Pin Connector $0.15 3 $0.45Resistor $0.02 17 $0.34Capacitor $0.12 20 $2.40PCB Board 100.00 1 100.00Total $178.31
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Questions