Mantracourt DCell Manuale utente

DCell

DSC

DCell & DSC

Strain Gauge or Load Cell Embedded Digitiser

Module MantraCAN – 2

Generation

Software Version 3 onwards

User Manual

MICRON METERS

www.micronmeters.com

[email protected]

Mantracourt Electronics Limited DCell & DSC MantraCAN User Manual

Contents

Chapter 1 Introduction ................................................................................................................. 4

Overview 4

Key Features 4

Special Facilities 5

Version 3 Additions and Enhancements 5

The Product Range 6

Which Device To Use 6

Additional DCell & DSC Variants Available 6

Some Application Examples 7

Chapter 2 Getting Started with the Evaluation Kit............................................................................... 8

The Evaluation Kit 8

Contents 8

Checking the Device Type 9

Connecting Up The Evaluation Kit 9

Initial Checks 9

Instrument Explorer 9

What Can Instrument Explorer Do? 9

Installing Instrument Explorer 9

Running the Instrument Explorer Software 10

Instrument Explorer Icon 10

Instrument Settings 11

Viewing Device Data 12

Instrument Explorer Parameter List 12

Connecting a Load Cell 13

DSJ1 Evaluation Board Sensor Connections 14

Performing A System Calibration 15

Chapter 3 Explanation o Category Items .........................................................................................20

Communications 20

ID, NODEIDL, NODEIDH 20

Example 20

CAN Bit Rate, BPS 21

Identifier Size, IDSIZE 21

CAN Bus, CANTXERR, CANRXERR, CANSTATUS 21

CANTXERR 21

CANRXERR 22

CANSTATUS 22

Streaming 22

Configuring Output Message Streams 22

Message Streams 22

Streaming Types, STRMTYPE 22

Starting and stopping Streaming, STRMON, STRMOFF 22

Message Configuration 23

Custom Start / Stop 24

Start Streaming 24

Stop Streaming 25

Data Types 26

Sub Formats 26

Message Output Examples 27

Streaming Start / Stop Examples 27

Information 27

Software Version, VER 27

Serial Number, SERL and SERH 27

Strain Gauge 28

mV/V output, MVV 28

Nominal mV/V level, NMVV 28

mV/V Output In Percentage Terms, ELEC 28

Mantracourt Electronics Limited DCell & DSC MantraCAN User Manual

Temperature Value, TEMP 28

Output Rate Control, RATE 28

Dynamic Filtering, FFST and FFLV 28

Cell 30

Temperature Compensation In Brief 30

Cell Scaling, CGAI, COFS 30

Two Point Calibration Calculations and Examples 30

Calibration Methods 31

Cell Limits, CMIN, CMAX 31

Linearisation In Brief 32

System 32

System Scaling, SGAI, SOFS 32

Example of calculations for SGAI and SOFS 32

System Limits, SMIN, SMAX 33

System Zero, SZ 33

System Outputs, SYS, SOUT 33

Reading Snapshot, SNAP, SYSN 33

Control 34

Shunt Calibration Commands, SCON and SCOF 34

Digital Output, OPON and OPOF 34

Flags 34

Diagnostics Flags, FLAG and STAT 34

Latched Warning Flags (FLAG) 34

Meaning and Operation of Flags 35

Dynamic Status Flags (STAT) 36

Meaning and Operation of Flags 36

Output Update Tracking 36

User Storage 36

USR1…USR9 36

Reset 37

The Reset command, RST 37

WARNING: Finite Non-Volatile Memory Life 37

Chapter 4 The Readings Process ....................................................................................................38

Flow diagram 38

Cell & System Scaling 39

Calibration Parameters Summary and Defaults 40

Chapter 5 Temperature Compensation ............................................................................................41

Purpose and Method of Temperature Compensation 41

Temperature Module Connections and Mounting (DTEMP) 41

Control Parameters 42

Internal Calculation 42

The Temperature Measurement 43

How to Set Up a Temperature Compensation 43

Parameter Calculations 44

Chapter 6 Linearity Compensation .................................................................................................45

Purpose and Method of Linearisation 45

Control Parameters 45

Internal Calculation 45

How to Set Up Linearity Compensation 46

Parameter Calculations and Example 46

Chapter 7 Sel -Diagnostics............................................................................................................48

Diagnostics Flags 48

Diagnostics LED 48

Chapter 8 MantraCAN Communication Protocol .................................................................................49

Basic Command Structure 49

Example of Read 50

Write 50

Mantracourt Electronics Limited DCell & DSC MantraCAN User Manual

Example of Write 51

Execute A Command 51

Example Of Execute A Command 51

Data Type Conversions and Rounding 52

Chapter 9 So tware Command Re erence .........................................................................................53

Commands in Access Order 53

Chapter 10 Installation ................................................................................................................57

Before Installation 57

Physical Mounting 57

Electrical Protection 57

Moisture Protection 57

Soldering Methods 59

Power Supply Requirements 59

Cable Requirements 59

Strain Gauge input (DSC) 59

Power and Communication 59

Temperature Sensor 60

Identifying Strain Gauge Connections 60

DCell Input Connections 60

DSC Input Connections 60

Identifying Bus-End Connections 61

DCell Bus Connections 61

DSC CAN Versions-Bus Connections 61

Strain Gauge Cabling and Grounding Requirements 62

DCell Strain Gauge Wiring 62

DCell Strain Gauge Wiring Arrangement 62

Key Requirements 62

Communications Cabling and Grounding Requirements 63

DCell Power and Communications Wiring 63

DCell Bus-End Arrangement 63

DSC4 Versions- Power and Communications Wiring 63

DSC4 Versions-Bus-End Arrangement 63

Key Requirements 63

Suitable Cable Types 64

DCell/DSC CAN Bus Cable 64

Indication Of Maximum Bus Length 64

CAN Bus Connections for Multiple DCells 65

CAN Bus Connections for Multiple DSC Versions 65

Key Requirements 66

Bus Layout and Termination 66

Loading 66

Strain Gauge Sensitivity Adjustment (DSC ONLY) 66

Identifying the DSC ‘Rg’ Resistor 66

Chapter 11 Troubleshooting .........................................................................................................68

LED Indicator 68

No Communications 68

Bad Readings 68

Unexpected Warning Flags 69

Problems with Bus Baud Rate 69

Recovering a ”lost” DCell/DSC 69

Resetting to default ID 69

First Command 69

Second Command 69

Chapter 12 Speci ications.............................................................................................................70

Technical Specifications DSC/DCELL High Stability 70

Technical Specifications DSC/DCELL Industrial Stability 71

Mechanical Specification for DSC 72

Mantracourt Electronics Limited DCell & DSC MantraCAN User Manual

Mechanical Specification for DCell 72

CE Approvals 72

Chapter 1 Introduction

This chapter provides an introduction to DCell/DSC products, describing the product range, main features and

application possibilities

Overview

The DCell and DSC products are miniature, high-precision Strain Gauge Converters; converting a strain gauge sensor

input to a CAN output They allow multiple high precision measurements to be made over a low-cost 2-wire link

Outputs can be accessed directly by PLCs or computers, or connected via various types of network, all without

compromising accuracy

The device is configurable via a proprietary MantraCAN protocol but is able to stream data in a customisable manner

to suit most CAN networks i.e. CANopen® or J1 3 .

This streamed data does not support any interaction, parameter writing or action commands. However all this can be

achieved using the MantraCAN protocol.

Customisable start and stop messages allow the instrument streaming to be controlled via the host CAN network.

Key Features

Ultra-miniature

The DCell ‘puck’ format can be fitted inside most load cell pockets, and similar restricted spaces The DSC cards

are similarly very small, optimised for mounting as a component onto custom PCBs

High-precision Industrial Version.

25ppm basic accuracy (equates to 16 bit resolution)

High-precision High Stability

5ppm basic accuracy (equates to 18 bit resolution) with comparable stability – far exceeds standard instrument

performance

Low-power

Low-voltage DC supply (5 6V min), typically 40mA for RS485 and 52mA for RS232 (including 350R strain gauge)

Adjustable sensitivity

Configured for standard 2 5mV/V full-scale strain gauges as supplied

A single additional resistor configures the input between 0 5 and 100 mV/V full-scale

Temperature sensing and compensation (optional)

An optional temperature sensor module is available and advanced 5-point temperature-compensation of

measurement

Linearity compensation

Advanced 7-point linearity compensation

CAN Output

Lower-cost cabling, improved noise immunity, and longer cable runs with no accuracy penalty

Device addressing allows up to 127 devices on a single bus, drastically reducing cabling cost and complexity

Two-way communications allow in-situ re-calibration, multiple outputs and diagnostics

No separate measuring instruments needed

Digital calibration

Completely drift-free, adjustable in-system and/or in-situ via standard communications link

Two independent calibration stages for load cell-and-system-specific adjustments

Programmable compensation for non-linearity and temperature corrections

Calibration data is also transferable between devices for in-service replacement

Mantracourt Electronics Limited DCell & DSC MantraCAN User Manual

Sel -diagnostics

Continuous monitoring for faults such as strain overload, over/under-temperature, broken sensors or unexpected

power failure

All fault warnings are retained on power-fail

Special Facilities

Output Capture Synchronisation

A single command instructs all devices on a bus to sample their inputs simultaneously, for synchronised data

capture

Output Tare Value

An internal control allows removal of an arbitrary output offset, enabling independent readings of net and gross

measurement values

Dynamic Filtering

Gives higher accuracy on stable inputs, without increased settling time

Programmable Output Modes

Output rate control enables speed/accuracy trade-off

ASCII output version provides decimal format control and continuous output mode for ‘dumb terminal’ output

Unique Serial Number

Every unit carries a unique serial-number tag, readable over the communications link

Communications Error Detection

CAN transmit and receive error counts along with CAN bus status can be read from the device

External Temperature Sensing (optional)

An external temperature module for improved accuracy (especially tracking changing temperature conditions)

So tware Reset

A special communications command forces a device reboot, as a failsafe to ensure correct operation

Version 3 dditions and Enhancements

The following are an outline only more detail will be found further on in this manual

DCell

•Easy mounting via a 2mm screw

•Connection via solder holes to either side of PCB

•Lower profile, dual PCB construction

DSC

•Additional I/O

•Easier shielding connection at load cell connector end

DCell & DSC

•Bit rates to 1 Mbps

•Higher sampling rate Sampling to 200Hz can now be achieved Also more sampling rates are available as

follows 1, 2, 5, 10, 20, 50, 60, 100 & 200Hz

•Lower cost With new technology and further use of miniaturisation the cost is now lower

•Real mV/V calibration Instead of % full scale the base measurement is in mV/V and is factory calibrated to

within 0 1% the % of FS output “ELEC” is still available

•Extreme Noise Immunity, 5 x heavy industrial level

•Diagnostics LED An LED is used to indicate that the device is powered and working correctly The LED is also

used to indicate which protocol the device is

•Remote shunt cal A 100K 1% 50ppm/Deg C resistor can be switched across the bridge to allow load cell

integrity to be established

•Peak & Trough Measurements Added to allow the faster rates to hold a peak or trough readings These are

stored in volatile memory & are therefore reset on power up

•Programmable dynamic filtering The filtering is the same as used on Version 2 but with the advantage of

being able to set the characteristics using the communications

Mantracourt Electronics Limited DCell & DSC MantraCAN User Manual

• Wide Operating Voltage The operating voltage is now 5 5 to 18V allowing the device to be powered from a

wider range of available system supplies

• DC Excitation DC excitation has now been employed allowing longer cable lengths for the load cells which is

particularly useful for DSC This is a 4-wire measurement

• Scaling implementation has been changed for both “CELL” and “SYS” The gain is applied before the offset

thus following the more standard approach This allows for an offset change to be made easily as the offset

is not a component of gain

The Product Range

Devices are available in two physical formats:

Which Device To Use

It is important to select the correct product for your application

First choose DCell or DSC based on your physical installation needs

Common Features

Both physical formats offer identical control and near-identical measurement performance

Di erences

Only the DSC (card) is available with digital Input & output

Special Aspects To Consider

The DCell fits neatly into a strain gauge pocket

The DSC lends itself to PCB mounting

dditional DCell & DSC Variants vailable

A separate variant is available with RS232 or RS485 output Refer to DCell & DSC CAN - 2

Generation - Manual

(These variants are sufficiently different to require their own manuals)

The following order codes are supported by an earlier version manual ‘DCell & DSC Version 2’

DLCPKASC, DLCPKMAN, DLCPKMOD, DSC2AS, DSC2MA, DSC2MB, DSC4AS, DSC4MA, DSC4MB

The DCell (puck) products consist of a Digital Strain Gauge Signal

Conditioner with CAN bus output in double sided component

population format

This is suitable for installation in very small spaces, including load

cell pockets

External connections are made by wiring to through hole pads

Mounting is via a 2mm mounting hole to accept M2 screw or American

equivalent #0-80 Important Note: DO NOT USE #2 screw size

The DSC (card) products are very similar to the DCell but in a

different physical form for mounting stand-alone or on a board

External connections are via header pins which can plug into

connectors, or be soldered to wires or into a host PCB DSC has an

open collector output and volt free digital input

Mantracourt Electronics Limited DCell & DSC MantraCAN User Manual

Some pplication Examples

Simple Distributed Measurement

Pressure loads are taken at a number of keys points in a manufacturing process, distributed over a large area

Each pressure sensor contains a DCell unit, and all the sensors are connected by a single cable carrying power and

CAN communications A central PC allows continuous display, monitoring and logging of all values from a central

control room This displays a control-panel and current display window, and logs information to an Excel

spreadsheet for future analysis

Further monitoring checks and displayed information can easily be added when required to the system where up to

127 ‘nodes’ can be installed

Low Cost Dedicated Weighing Station

A basic load cell weighing-pad device has a cable leading to a wall mounted weight display

Digital Load Cell

Load cell products are offered with a high-precision digital communications option

A DCell is fitted into the gauge pocket of each load cell in manufacture During product testing, each unit undergoes

a combined load test and temperature cycle Each unit is then programmed with individually calculated gain, offset,

linearity and temperature compensation tables All units perform to a very tight specification without the use of any

trimming components

High Reliability Load sensing

A road bridge has a dedicated load monitoring and active control computer system System calibration adjustments

are only established during construction, so sensors must be replaceable without recalibration

Each load monitoring point has a digital load cell fitted, with calibration values set during construction Self-

diagnostics aid detection of failures

When a failed load cell is replaced it will produce identical force measurements The old load cell set-up data

values are programmed into the separate user-level calibration store in the unit, to produce an identically

performing replacement

Load Balance Monitor

A lorry loading weighpoint monitors left/right load balance and sounds a warning if loading is too uneven for safety

A drive-on weighing platform is provided with load cells at each of four corners Each cell is wired to a DSC unit, and

these are cabled to a 3

party LCD display and control unit, producing a complete turnkey system A digital I/O card

is wired to the same bus to control the warning alarm Application software running on the control unit provides a %

left/right balance readout with a graphical tipping display, and a total weight indication

The balance indication is calculated by comparing the different corner readings If it exceeds a programmed limit, a

command to the I/O card turns the relay on

Total weight is calculated by summing the individual results mathematically

Automatic re-zeroing occurs when the total is near zero for more than a few seconds

A control button enables a set-up mode for recalibration (protected by operator password), which displays individual

readings and total Corner compensation can be checked by observing the changing total as a weight is moved

around Simple button presses control two point recalibration for any cell

Mantracourt Electronics Limited DCell & DSC MantraCAN User Manual

Chapter 2 Getting Started with the Evaluation Kit

This chapter explains how to connect up a DCell/DSC for the first time and how to get it working For simplicity,

this chapter is based on the standard DCell/DSC Evaluation Kit, which contains everything needed to communicate

with a puck or card from your PC

It is advised that first time users wishing to familiarise themselves with the product use the Mantracourt Evaluation

Kit This provides a low cost, easy way to get started

If you do not have an Evaluation Kit, the instructions in this chapter mostly still apply, but you will need to wire up

the device (and possible bus-converter) and have some means of communicating with it

The Evaluation Kit

Contents

• An Evaluation PCB (DSJ1) which comprises of

• A 8 way screw connector for the strain gauge & Temperature sensor

• A 5 way screw connector for power & CAN comms

• A 9 way ‘D’Type for direct CAN (limited to 500Kbps)

• Link headers for CAN, RS232 or RS485 comms selection

• Terminating resistor for CAN & RS485

• LED for power indication

• LED for digital output (DSC only)

• Push Switch for digital input (DSC only)

• An Evaluation DCell or DSC of your choice

• A CD ROM containing Instrument Explorer software

• A 9 way ‘D’Type extension lead

• A USB-CAN converter

• DTEMP temperature sensor for temperature compensation evaluation

Other Things you will need

• A regulated power supply, capable of providing 5 6 –18V at 100mA

• A PC running Windows 98 or above, with a spare USB port and 45Mb free disk space

and, ideally

• A strain gauge, load cell or simulator, 350-5000 ohms impedance

Mantracourt Electronics Limited DCell & DSC MantraCAN User Manual

Checking the Device Type

For a DCell, the Product Code is one o the ollowing 2 types

DLCSMCAN

DLCHMCAN

Industrial Stability MantraCAN output

High Stability MantraCAN output

For a DSC card, the Product Code is one o the ollowing 2 types

DSCSMCAN

DSCHMCAN

Industrial Stability MantraCAN output

High Stability MantraCAN output

The CAN bus Identi ier ID o a New DCell/DSC device is actory set to 1

This can be changed if required but for ease of evaluating it is suggested that you use this default value

Connecting Up The Evaluation Kit

Power is supplied to the DSJ1 via the 5 way connector (J1) This is connected to a supply set between 5 6v and 18v

DC The red wire being positive and the black negative The CAN is connected using the 9 way D-type extension lead

to J3 and to the USB-CAN converter

Ensure LK1 & LK5 are set to “CAN/RS485” Fit LK2 which terminates the CAN bus

Switch on, the Green Power LED of the DSJ1 should be on

Initial Checks

With no load cell connected The LED of the DCell or DSC should flash OFF for 100ms every 0 5s

Note: If a Load cell is connected and there are no errors then the LED will Flash ON for 100mS then Off for the

above period This being the normal healthy state

Another check that the device is working okay is by noting the current drawn from the supply, this should be about

40mA

Instrument Explorer

Instrument Explorer is Mantracourts own communication interface for our range of standard products It provides

communications drivers for the DCell/DSC products A complimentary copy is provided on CD-ROM with the

DCell/DSC Evaluation Kit Instrument Explorer can also be downloaded from Mantracourts website

http://www mantracourt co uk/software/Instrument_Explorer

Instrument Explorer is a software application that enables communication with Mantracourt Electronics

instrumentation for configuration, calibration, acquisition and testing purposes

The clean, contemporary interface allows full customisation to enable your Instrument Explorer to be moulded to

your individual requirements

What Can Instrument Explorer Do?

•Save and restore customisable user workspace

•Read and Write individual instrument parameters

•Save and restore parameter configurations

•Log data to a window or file

•Perform calibration and compensation

•

Installing Instrument Explorer

Install the Instrument Explorer software by inserting the CD in the CD ROM drive This should start the ‘AutoRun’

process, unless this is disabled on your computer

(If the install program does not start of its own accord, run SETUP EXE on the CD by selecting ‘Run’ from the ‘Start

Menu’ and then entering D:\SETUP, where D is the drive letter of your CD-ROM drive)

The install program provides step-by-step instructions The software will install into a folder called

InstrumentExplorer inside the Program F les folder You may change this destination if required

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