Eilersen MCE2035 Manuale utente

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Applies for:

Program no.: CONCTR_4.091117.0

Document no.: 1117mu2035-2010-0a.DOC

Date: 2011-05-17

Rev.: 0a

MCE2035 PROFIBUS DP MODULE

Transfer the status and weight of digital loadcells

MCE2035: User manual

Version: 2011-05-17, rev.: 0a Page: 2

1) CONTENTS

1) CONTENTS.....................................................................................................................................2

2) INTRODUCTION ...........................................................................................................................3

2.1 Introduction.................................................................................................................................3

2.2 Profibus-DP specification...........................................................................................................3

3) MCE2010 DESCRIPTION..............................................................................................................4

4) MCE9601 DESCRIPTION..............................................................................................................6

5) DATA EXCHANGE .......................................................................................................................8

5.1 Profibus-DP communication using PPO.....................................................................................8

5.2 Data formats................................................................................................................................9

5.2.1 Unsigned integer format (16 bit)......................................................................................9

5.2.2 Signed integer format (32 bit)..........................................................................................9

5.2.3 IEEE754 floating point format (32 bit)..........................................................................10

5.3 Measurement time.....................................................................................................................11

5.4 Filtering.....................................................................................................................................11

5.5 Scaling.......................................................................................................................................11

6) DATA PROCESSING...................................................................................................................12

6.1 Zeroing, calibration and weight calculation..............................................................................12

6.1.1 Zeroing of weighing system...........................................................................................12

6.1.2 Corner calibration of weighing system ..........................................................................12

6.1.3 Calculation of uncalibrated system weight ....................................................................13

6.1.4 System calibration of weighing system..........................................................................13

7) INSTALATION OF SYSTEM......................................................................................................14

7.1 Checklist during installation.....................................................................................................14

8) HARDWARE DESCRIPTION .....................................................................................................15

8.1 MCE2035 overview..................................................................................................................15

8.2 Connection of power and load cells..........................................................................................16

8.3 DIP-switch settings...................................................................................................................17

8.4 Light Emitting Diodes...............................................................................................................17

8.5 Jumpers.....................................................................................................................................18

8.6 Profibus-DP connector..............................................................................................................19

8.7 Hardware Selftest......................................................................................................................19

8.8 Update times .............................................................................................................................19

9) STATUS CODES ..........................................................................................................................20

MCE2035: User manual

Version: 2011-05-17, rev.: 0a Page: 3

2) INTRODUCTION

2.1 Introduction

This document describes the use of a MCE2035 Profibus-DP module from Eilersen Elec-

tric, when it is equipped with the program listed on the front page.

With the program specified on the front page, the MCE2035 Profibus-DP module is capa-

ble of transmitting weight and status for up to 4 load cells in a single telegram. Each load

cell is connected to the Profibus-DP module through a load cell interface module.

It is possible to connect the MCE2035 Profibus-DP module to a Profibus-DP network,

where it will act as a slave. It will then be possible from the Profibus-DP master to read

status and weight for each of the connected load cells. Functions as zeroing, calibration and

calculation of system weight(s) must be implemented on the Profibus-DP master.

By use of DIP-switches it is possible to:

-select measurement time.

-select scaling.

-include one of 3 different FIR filters.

Exchange of data between master and slave takes place as described in the following.

2.2 Profibus-DP specification

The MCE2035 Profibus-DP module confirms to the following Profibus-DP specifications:

Protocol: Profibus-DP

Communications form: RS485

Module type: Slave

Baud rates [kbit/sec]: 9.6, 19.2, 93.75, 187.5, 500, 1500, 3000, 6000, 12000

Profibus address: 0-127

Profibus connection: 9-pin sub-D (female) connector

IMPORTANT: Load cell modules and instrumentation must be placed outside the

hazardous zone if the load cells are used in hazardous ATEX (Ex) area. Furthermore,

only ATEX certified load cells and instrumentation can be used in ATEX applica-

tions.

MCE2035: User manual

Version: 2011-05-17, rev.: 0a Page: 4

3) MCE2010 DESCRIPTION

Below the layout of the MCE2010 load cell module is shown. Before using the system the

load cells must be connected to the load cell modules.

Please notice that the load cell and the load cell module MUST be marked

with the same year/serial number. These are printed on the type-plate of the

load cell and on a small sticker placed below the BNC plug on the load cell

module. Load cells and load cell modules MUST NOT be intermixed because

the program in each load cell module is SPECIALLY adapted to one load

cell only (and only this load cell). The load cell module MUST be connected

to exactly the load cell it is intended for and vice versa.

Flat cable connector

10 contacts

BNC connector

for loadcell

TXBB

SYNC

ERR

MCE2010

Eilersen Electric

The load cell modules are connected to each other using the supplied cable (10 pole ribbon

cable). The MCE9601 terminal module (the one with connection terminals) and the

MCE2035 Profibus-DP module are connected using the same cable.

MCE2035: User manual

Version: 2011-05-17, rev.: 0a Page: 5

All switches (SW1) in the load cell module must be at the correct position before use.

Please notice that the switches (SW1) are only read once during power-up. If a change in

the switch setting is necessary the power has to be disconnected and then reconnected (af-

ter 10 seconds). Then the MCE2010 load cell module recognizes the new switch setting.

The switches SW1.1 to SW1.4 are used to select different modes of operation. The below

table is valid for the normal standard software in the load cell module. Unless expressly

specified, the default settings must normally be used.

MCE2010 SW1.1 to SW1.4

SW1 No Default setting Function

1 OFF Baud rate

OFF: 115200

ON: 230400

2 ON Filter, MSB

3 ON Filter, LSB

4 OFF Not used

Switch SW1.5 to SW1.8 are used for address selection. All load cell modules must have

unique addresses ascending from 0 with no gaps unless expressly specified otherwise. No

addresses may be skipped and no addresses may be used by more than one load cell mod-

ule. In systems with 1-8 load cells switch SW1.5 must be set to OFF.

MCE2010 SW1.6 to SW1.8

SW1.5 SW1.6 SW 1.7 SW1.8 Address

OFF OFF OFF OFF 0

OFF OFF OFF ON 1

OFF OFF ON OFF 2

OFF OFF ON ON 3

OFF ON OFF OFF 4

OFF ON OFF ON 5

OFF ON ON OFF 6

OFF ON ON ON 7

The three LED’s are used to indicate the following conditions:

MCE2010 LED’S

TXBB Green Lit whenever the load cell module transmits data. Must be

on/flashing rapidly whenever the system is started.

D1 Yellow No synchronisation between load cell modules: One or more load

cells not connected to load cell module or poor connection.

SYNC ERR Red No load cell synchronisation: No load cell connected to load cell

module or poor connection.

MCE2035: User manual

Version: 2011-05-17, rev.: 0a Page: 6

4) MCE9601 DESCRIPTION

Below the layout of the MCE9601 terminal module is shown. The MCE9601 module is

used for connection between the Eilersen Electric digital load cell bus at one side and

power supply/equipment at the other side.

The J1 terminal block is used for connection of the following:

•Terminals Gnd and B(-) and A(+) gives access to the RS485 bus of all equipment

connected to the load cell bus.

•Terminals Gnd and +24Vdc provides external power to the equipment connected to the

load cell bus. These terminals have to be connected to an external +24VDC power sup-

ply.

•Terminals Gnd and I/O are the internal synchronization signal used by the load cell

modules. Normally these terminals have no external connection and must be left open.

The J2 connector is used for connecting equipment (load cell modules, communication

modules etc.) on the digital load cell bus by using the supplied ribbon cable with mounted

connectors.

The JU1 jumper is used for hardware synchronisation. Normally this jumper should be left

in the default factory setting which is ON.

The light emitting diodes on the MCE9601 module have the following function:

LED Function

(Green) RS485 Communication. This LED should be ON during normal operation (Actually it is

flashing quickly, but this can look like a steady light).

(Yellow) This LED should be OFF during normal operation. If this lamp is lit, the I/O pin is at re-

versed polarity.

(Red) Hardware Synchronisation. This LED should be ON during normal operation (Actually

it is flashing quickly, but this can look like a steady light).

Gnd

+24Vdc

Gnd

I/O

JU1

MCE2035: User manual

Version: 2011-05-17, rev.: 0a Page: 7

MCE2035: User manual

Version: 2011-05-17, rev.: 0a Page: 8

5) DATA EXCHANGE

5.1 Profibus-DP communication using PPO

Profibus-DP communication with the MCE2035 module uses a so called ’parameter-

process data object’ (PPO) consisting of 26 bytes. This telegram (object) is only used when

transferring data from the slave to the master, since no data are transmitted from the master

to the slave. The structure for this telegram is as follows:

Status(0) Lc

Signal(0) Lc

Status(3) Lc

Signal(3)

0 1 2 3 4 5 6 7 20 21 22 23 24 25

The byte order (MSB/LSB first?) for the individual parts of the telegram is determined by

a jumper. Normally this jumper is set from the factory so that MSB comes first. In the fol-

lowing bit 0 will represent the least significant bit in a register.

LcRegister is a word (two bytes) that constitute a bit register for indication of connected

load cells detected during power on. Hence bit 0-3 will be ON, if the corresponding load

cell (address) was detected during power on. LcRegister is always transferred in 16 bit

unsigned integer format.

LcStatus(X) is a word (two bytes) that constitute a register containing the actual status for

load cell X. LcStatus(X) is always transferred in 16 bit unsigned integer format. During

normal operation this register will be 0, but if an error occurs some bits in the register will

be set resulting in an error code. The meaning of each individual bit in the status register

can be found in the chapter STATUS CODES.

LcSignal(X) is a double word (four bytes) constituting a register containing the actual

weight signal from load cell X. Depending on a jumper LcSignal(X) will be in either 32

bit signed integer format or in IEEE754 floating point format. This jumper is default set

so transfer of LcSignal(X) is done in 32 bit signed integer format. Note that the value is

only valid if the corresponding LcStatus(X) register is 0 indicating no error present. The

scaling of the load cell signal is determined by a DIP-switch as described later.

Since only status and weight for the load cells are transmitted in the telegram, functions

such as status handling, calculation of system weight(s), zeroing and calibration must be

implemented on the Profibus-DP master. Please refer to the chapter DATA PROCESSING

for an explanation on how this typically can be done.

MCE2035: User manual

Version: 2011-05-17, rev.: 0a Page: 9

5.2 Data formats

The Profibus-DP communication can transfer data in the following three data formats. If

necessary please refer to other literature for further information on these formats.

5.2.1 Unsigned integer format (16 bit)

The following are examples of decimal numbers represented on 16 bit unsigned integer

format:

Decimal Hexadecimal Binary (MSB first)

0 0x0000 00000000 00000000

1 0x0001 00000000 00000001

2 0x0002 00000000 00000010

200 0x00C8 00000000 11001000

2000 0x07D0 00000111 11010000

20000 0x4E20 01001110 00100000

5.2.2 Signed integer format (32 bit)

The following are examples of decimal numbers represented on 32 bit signed integer for-

mat:

Decimal Hexadecimal Binary (MSB first)

-20000000 0xFECED300 11111110 11001110 11010011 00000000

-2000000 0xFFE17B80 11111111 11100001 01111011 10000000

-200000 0xFFFCF2C0 11111111 11111100 11110010 11000000

-20000 0xFFFFB1E0 11111111 11111111 10110001 11100000

-2000 0xFFFFF830 11111111 11111111 11111000 00110000

-200 0xFFFFFF38 11111111 11111111 11111111 00111000

-2 0xFFFFFFFE 11111111 11111111 11111111 11111110

-1 0xFFFFFFFF 11111111 11111111 11111111 11111111

0 0x00000000 00000000 00000000 00000000 00000000

1 0x00000001 00000000 00000000 00000000 00000001

2 0x00000002 00000000 00000000 00000000 00000010

200 0x000000C8 00000000 00000000 00000000 11001000

2000 0x000007D0 00000000 00000000 00000111 11010000

20000 0x00004E20 00000000 00000000 01001110 00100000

200000 0x00030D40 00000000 00000011 00001101 01000000

2000000 0x001E8480 00000000 00011110 10000100 10000000

20000000 0x01312D00 00000001 00110001 00101101 00000000

MCE2035: User manual

Version: 2011-05-17, rev.: 0a Page: 10

5.2.3 IEEE754 floating point format (32 bit)

Representation of data on IEEE754 floating point format is done as follows:

Byte1 Byte2 Byte3 Byte4

bit7 bit6 bit0 bit7 bit6 bit0 bit7 bit0 bit7 bit0

S 27…..…. 212

-1 ……... 2-7 2-8 ………….... 2-15 2

-16 ………..…. 2-23

Sign Exponent Mantissa Mantissa Mantissa

Formula:

Value = (-1)S * 2(exponent-127) * (I+Mantissa)

Example:

Byte1 Byte2 Byte3 Byte4

0100 0000 1111 0000 0000 0000 0000 0000

Value = (-1)0* 2(129-127) * (1 + 2-1 + 2-2 + 2-3) = 7.5

Please note that if transfer of MSB first has been selected (default setting), the byte with

the “sign” will come first in the weight indications, and if LSB first has been selected the

byte with the “sign” will come last in the weight indications.

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