JUMO IMAGO 500 Manuel utilisateur

JIMAGO 500

Multi-channel process and

program controller

B 70.3590.2

Interface Description

05.02/00403594

Contents

1 Introduction 5

1.1 Preface .......................................................................................................... 5

1.2 Typographical conventions ......................................................................... 6

1.2.1 Warning signs ................................................................................................. 6

1.2.2 Note signs ...................................................................................................... 6

1.2.3 Representation ............................................................................................... 6

2 Protocol description 7

2.1 Master-slave principle ................................................................................. 7

2.2 Transmission mode (RTU) ........................................................................... 7

2.3 Device address ............................................................................................. 8

2.4 Timing of the communication ..................................................................... 8

2.4.1 Timing of a data request .............................................................................. 10

2.4.2 Communication during the internal processing time of the slave ................ 11

2.4.3 Communication during the response time of the slave ............................... 11

2.5 Structure of the data blocks ...................................................................... 11

2.6 Error handling ............................................................................................. 11

2.7 Checksum (CRC16) .................................................................................... 13

2.8 Interface ...................................................................................................... 14

3 Functions 15

3.1 Read n words .............................................................................................. 15

3.2 Write one word ........................................................................................... 16

3.3 Write n words .............................................................................................. 17

Contents

4 Data flow 19

5 Address tables 21

5.1 Process data ............................................................................................... 21

5.2 Setpoints ..................................................................................................... 25

5.3 Manual output ............................................................................................. 25

5.4 Controller parameter ................................................................................. 26

5.5 Program start with start data .................................................................... 29

5.6 Manual operating mode with manual data .............................................. 30

5.7 Program transmission ............................................................................... 30

5.8 Commands .................................................................................................. 31

5.9 Frequent setpoint programming ............................................................... 33

5.10 Process value via interface ....................................................................... 34

5.11 Device identification .................................................................................. 34

5.12 Setting the clock ........................................................................................ 35

6 Program example 37

1 Introduction

1.1 Preface

Please read these Operating Instructions before commissioning the interface.

Keep the manual in a place that is accessible to all users at all times.

Please assist us to improve these operating instructions, where necessary.

Your suggestions will be appreciated.

Phone +49 6616003-0

Fax +49 661 6003-607

HAll the necessary information for operating the interface is

contained in these operating instructions. However, if any

difficulties should still arise during start-up, please do not carry out

any unauthorized manipulations. You could endanger your rights

under the instrument warranty!

Please contact the nearest subsidiary or the main factory in such a

case.

EWhen returning modules, assemblies or components, the

regulations of EN 100 015 “Protection of electrostatically sensitive

components” must be observed. Use only the appropriate ESD

packaging for transport.

Please note that we cannot accept any liability for damage caused

by ESD (electrostatic discharge).

1 Introduction

1.2 Typographical conventions

1.2.1 Warning signs

The symbols for Danger and Caution are used in these operating instructions

under the following conditions:

1.2.2 Note signs

1.2.3 Representation

VDanger This symbol is used when there may be danger to personnel

if the instructions are ignored or not followed correctly!

!Caution This symbol is used when there may be damage to

equipment or data if the instructions are ignored or not

followed correctly!

ECaution This symbol is used where special care is required when

handling components liable to damage through electrostatic

discharge.

"Info This symbol is used when your special attention is drawn to a

remark.

#Reference This symbol refers to further information in other manuals,

chapters or sections.

abc1Footnote Footnotes are remarks that refer to specific points in the text.

Footnotes consist of two parts:

A marker in the text, and the footnote text.

The markers in the text are arranged as continuous superscript

numbers.

The footnote text (in smaller typeface) is placed at the bottom

of the page and starts with a number and a full stop.

0x0010 Hexadecimal

number

A hexadecimal number is identified by being preceded by an

“0x” (here: 16 decimal).

2 Protocol description

2.1 Master-slave principle

The communication between a PC (master) and a device (slave) using

MODbus takes place according to the master-slave principle, in the form of a

data request/instruction - response.

The master controls the data exchange, the slaves only have a response

function. They are identified by their device address.

2.2 Transmission mode (RTU)

The transmission mode used is the RTU mode (Remote Terminal Unit). Data

are transmitted in binary format (hexadecimal) with 8 bits. The LSB (least

significant bit) is transmitted first. The ASCII operating mode is not supported.

Data format

The data format describes the structure of a character transmitted. The

following format options are available:

Master

Slave 1 Slave 2 Slave n

Data word Parity bit Stop bit

1/2 bit

Bit number

8 bit — 1 9

8 bit even 1 10

8 bit odd 1 10

8 bit — 2 10

2 Protocol description

2.3 Device address

The device address of the slave can be set between 0 and 254. Address 0 is

reserved.

Two forms of data exchange can be distinguished:

Query Data request/instruction by the master to a slave, via the corresponding

device address.

The slave addressed responds.

Broadcast Instruction by the master to all slaves, via the device address 0. The

connected slaves do not respond. A specific setpoint can, for example, be

transmitted to all slaves. In such a case, the correct acceptance of the values

by the slaves should be checked by a subsequent readout of the setpoint.

A data request with device address 0 is not meaningful.

2.4 Timing of the communication

Start and end of a data block are marked by transmission pauses. The

maximum permitted interval between two consecutive characters is three

times the transmission time of a single character.

The character transmission time (the time taken to transmit one character)

depends on the baud rate and the data format that is used (stop bits and

parity bit).

For a data format with 8 data bits, no parity bit and one stop bit, this is:

character transmission time [msec] = 1000 * 9 bits/(baud rate)

For the other data formats it is:

character transmission time [msec]

= 1000 * (8 bits+parity bit+stop bit(s)) bits/(baud rate)

Sequence

HA maximum of 31 slaves can be addressed via the RS422/485

interface.

Data request from master

transmission time = n characters * 1000 * x bits/(baud rate)

Marker for end of data request

3 characters * 1000 * x bits/(baud rate)

Processing of the data request by the slave (max. 250msec)

Response of slave

transmission time = n characters * 1000 * x bits/(baud rate)

Marker for end of response

3 characters * 1000 * x bits/(baud rate)

2 Protocol description

Example Marker for end of data request or end of response for 10/9 bit data format

Waiting time = 3 characters * 1000 * 10 bits/(baud rate)

Baud rate [baud] Data format [bit] Waiting time [msec]

(3 characters)

38400 10 0.79

90.71

19200 10 1.57

91.41

9600 10 3.13

92.82

2 Protocol description

2.4.1 Timing of a data request

Timing scheme A data request runs according to the following timing scheme:

t0End marker = 3 characters

(the time depends on the baud rate)

t1This time depends on the internal processing.

The maximum processing time is 250 msec.

The minimum response time which can be set is required by the RS485

interface in the master, in order to switch over the interface driver from

transmit to receive. This parameter is not required for the RS422 interface.

t2This time is needed by the controller, to switch over from transmit back to

receive. This is the waiting time which the master has to observe before

presenting a new data request. This time must always be observed, even

when the new data request is directed to a different device.

RS422 interface: t2= 1msec

RS485 interface: t2= 10msec

HA minimum response time can be set in the controller, under the

menu item “Interface”. This preset time is the minimum time which

will be waited before an answer is transmitted (0 — 500 msec). If a

smaller value is set, then the response time may be longer than the

preset value (because the internal processing time is longer), the

controller answers as soon as the internal processing is

completed. A preset time of 0 msec means that the controller

answers with the maximum possible speed.

DatenanfrageMaster

Slave

Datenanfrage

Antwort

t0t1t0

Data request Data request

Response

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