JUMO DICON 400 User manual

JDICON 400/500
Universal process controller
JDICON 401/501
Universal profile controller
Universal profile generator
B 70.3570.2
Interface Description
10.99/00371593

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 Presentation ................................................................................................... 6
2 Protocol description 7
2.1 Master-slave principle ................................................................................. 7
2.2 Transfer mode (RTU) .................................................................................... 7
2.3 Instrument 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 1 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 ..................................................................................................... 23
5.3 Manual output ............................................................................................. 23
5.4 Controller parameters ................................................................................ 24
5.5 Configuration .............................................................................................. 25
5.6 Limit comparators ...................................................................................... 25
5.7 Analogue inputs .......................................................................................... 27
5.8 Outputs ........................................................................................................ 28
5.9 Ramp and profile program function (only Type 703570/75) .................... 29
5.10 Profile controller (only Type 703580/85) ................................................... 29
5.11 System states (only Type 703580/85) ........................................................ 29
5.12 Mathematics and logic module ................................................................. 31
5.13 Displays ....................................................................................................... 31
5.14 Real-time clock (only Type 703580/85) ..................................................... 31
5.15 Binary/logic functions ................................................................................ 32
5.16 Interface ...................................................................................................... 32
5.17 Program start with start data (only Type 703580/85) .............................. 33
5.18 Operating mode Manual with man. data (only Type 703580/85) ............ 33
5.19 Transmit program (only Type 703580/85) ................................................. 33
5.20 Commands .................................................................................................. 34
5.21 Frequent setpoint programming ............................................................... 35
5.22 Process value via interface ....................................................................... 35
5.23 Instrument identification ........................................................................... 35
5.24 External relay module ................................................................................ 36
5.25 Setting the clock (only Type 703580/85) ................................................... 37
6 Sample program 39

5
1 Introduction
1.1 Preface
Please read this manual before commissioning the interface. Keep the
manual in a place that is accessible to all users at all times.
Please help us to improve this manual.
Your suggestions will be most welcome.
Phone Germany (06 61) 6003-727
abroad ([phone]
Fax Germany (06 61) 6003-508
abroad ([phone]
HAll the necessary information for operating the interface is
contained in this manual. If any difficulties should still arise
during start-up, you are asked not to carry out any
manipulations which are not permitted. You could endanger
your rights under the instrument warranty!
Please contact the nearest JUMO office or the main factory.
EWhen returning chassis, assemblies or components, the rules
of EN 100 015 “Protection of electrostatically sensitive
devices” have to be observed. Use only the appropriate ESD
packaging material for transport.
Please note that we cannot be held liable for damages
caused by ESD (electrostatic discharge).

1 Introduction
6
1.2 Typographical conventions
1.2.1 Warning signs
The signs for Danger and Warning are used in this Manual under the
following conditions:
1.2.2 Note signs
1.2.3 Presentation
VDanger This symbol may be used when there may be danger to
personnel if the instructions are disregarded or not
followed accurately!
Warning This symbol is used when there may be damage to
equipment or data if the instructions are disregarded or
not followed accurately!
EWarning This symbol is used where special care is required when
handling components liable to damage through
electrostatic discharge.
Note This symbol is used when your special attention is
drawn to a remark.
Reference This sign refers to further information in other handbooks,
chapters or sections.
abc1Footnote Footnotes are notes which refer to certain points in the
text. Footnotes consist of two parts:
A marking in the text, and the footnote text.
The markings in the text are arranged as continuous
raised (superscript) numbers. The footnote text (in a
smaller typeface) is placed at the bottom of the text and
starts with a number and a full stop.
0x0010 Hexa-
decimal
no.
A hexadecimal number is identified by being preceded by
“0x” (here 16 decimal).

7
2 Protocol description
2.1 Master-slave principle
The communication between a PC (master) and an instrument (slave)
using MODbus /Jbus takes place according to the master-slave princi-
ple in the form of a data request/instruction - response.
The master controls the data exchange, the slaves only have response
function. They are identified by their instrument address.
2.2 Transfer mode (RTU)
The transfer mode used is the RTU (Remote Terminal Unit). Data are
transferred in binary format (hexadecimal) with 8 bits. The LSB (least
significant bit) is transferred first. The ASCII operating mode is not sup-
ported.
Data format The data format describes the arrangement of a transferred byte. The
following options are available for the data format:
Master
Slave 1 Slave 2 Slave n
Data word Parity bit Stop bit
1/2 bits
No. of bits
8 bits — 1 9
8 bits even 1 10
8 bits odd 1 10
8 bits — 2 10
8 bits even 2 11
8 bits odd 2 11

2 Protocol description
8
2.3 Instrument address
The addresses of the slaves can be set from 1to 31. The instrument ad-
dress 0 is reserved.
There are two distinct types of data exchange:
Query Data request/instruction from the master to a slave, via the correspond-
ing address. The slave that is accessed will respond.
Broadcast An instruction from the master to all slaves, via address 0. The slaves in
the system do not respond. For example, a certain setpoint can be
transmitted to all slaves. In this case, the correct acceptance of the val-
ue by the slaves should be checked by a subsequent read-out of the
setpoint.
A data request using instrument address 0 is meaningless.
2.4 Timing of the communication
The start and end of a data block are identified by transmission pauses.
The maximum permitted interval between two consecutive characters is
three times the time for transmitting one character.
The character transmission time (time for transmitting a character) de-
pends on the baud rate and the data format that is used (stop bits and
parity bit).
If the data format has 8 data bits, no parity bit and one stop bit, then:
character transmission time [msec] = 1000 * 9 bits/(baud rate)
For the other data formats:
character transmission time [msec]
= 1000 * (8 bits+parity bit+stop bit(s))/(baud rate)
Procedure
HThe RS422/485 interface can access a maximum of 254
slaves.
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 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)

9
2 Protocol description
Example Marker for end of data request or end of response for 10/9 bits data for-
mat.
Waiting time = 3 characters * 1000 * 10 bits/(baud rate)
Baud rate [baud] Data format [bit] Waiting time [msec]
19200 11 1.718
10 1.563
91.406
9600 11 3.4375
10 3.125
92.813
4800 11 6.875
10 6.25
95.625
2400 11 13.75
10 12.5
911.25
1200 11 27.5
10 25.0
922.5

2 Protocol description
10
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 adjustable response time is required by the RS485 in-
terface of the master, to switch the interface driver over from send
to receive. This parameter is not needed by the RS422 interface.
t2This is the time required by the controller to switch from transmit-
ting back to receiving. The master must wait for this length of time
before making a fresh data request. The time must always be main-
tained, even if the new data request is addressed to a different in-
strument.
RS422 interface: t2= 1msec
RS485 interface: t2= 10msec
HA minimum response time can be set up in the controller, un-
der the menu item “Interface”. At least this preset time
(0 — 500 msec) must elapse before a response can be sent.
If a smaller value is set, then the response time may be longer
than the set value (because the internal processing time is
longer) and the controller will then respond as soon as the in-
ternal processing is completed. If the time is set to 0 msec,
this means that the controller will respond as fast as it can.
DatenanfrageMaster
Slave
t
Datenanfrage
Antwort
t2 t0t1t0
Data request Data request
Response

11
2 Protocol description
2.4.2 Communication during the internal processing time of the slave
The master must not make any data requests during the internal
processing time of the slave. Any data requests that are made during
this time will be ignored by the slave.
2.4.3 Communication during the response time of the slave
The master must not make any data requests during the response time
of the slave. Making any data requests during this period will cause all
data currently on the bus to become invalid.
2.5 Structure of the data blocks
All data blocks have the same structure:
Data structure
Each data block consists of four fields:
Slave address instrument address of a specific slave
Function code function selection (reading, writing of words)
Data field contains the information:
- word address
- word number
- word value
Checksum for recognition of transmission errors
2.6 Error handling
Error codes There are three error codes:
1 invalid function
2 invalid parameter address
8 write access denied to parameter
Slave
address
Function
code
Data field Checksum
CRC16
1 byte 1 byte x byte(s) 2 bytes

2 Protocol description
12
Response in
error situation
The function code is OR-linked with 0x80, i.e. the most significant bit is
set to 1.
Example Data request:
Response:
Special cases The slave will not respond in the event of the following errors:
- the checksum (CRC16) is not correct
- the instruction of the master is incomplete or over-defined
- the number of words or bits to be read is zero
Slave
address
Function
XX OR 80h
Error code Checksum
CRC16
1 byte 1 byte 1 byte 2 bytes
01 03 00 00 00 04 CRC16
01 83 02 CRC16

13
2 Protocol description
2.7 Checksum (CRC16)
The checksum (CRC16) serves to recognize transmission errors. If an
error is identified during processing, the appropriate instrument will not
respond.
Calculation
method
Example Data request: read two words, starting at address 0x1053
(CRC16 = 0x30BC)
Response: (CRC16 = 0xADF5)
CRC = 0xFFFF
CRC = CRC XOR ByteOfMessage
For (1 to 8)
CRC = SHR(CRC)
if (flag shifted right = 1)
then else
CRC = CRC XOR
0xA001
while (not all ByteOfMessage processed);
07 03 10 53 00 02 30 BC
CRC16
07 03 04 00 00 41 C8 AD F5
Wo r d 1 Wo r d 2 C R C 1 6

2 Protocol description
14
2.8 Interface
C2 Protocol type MODbus
Interface MODbus integer
Data format Parity no parity
odd parity
Symbol
explanation:
* = enter
value
=factory-set
even parity
zero parity
Stop bit 1 stop bit
2 stop bits
Baud rate 1200 baud
2400 baud
4800 baud
9600 baud
19200 baud
Instrument address Value *_______
Value range:
0 — 254
factory-set: 0
Minimum
response time
Value *_______
Value range:
0 — 500 msec
factory-set: 0 msec

15
3 Functions
The following functions are available to the instrument:
3.1 Read n words
This function reads n words, starting from a defined address.
Data request
Response
Example Read the 2 setpoints of the controller
Word address = 0x1053 (setpoint W1)
Data request:
Response:
Function number Function
0x03/0x04 Read n words
0x06 Write 1 word
0x10 Write n words
Slave
address
Function
0x03 or 0x04
Address of
first word
No. of words
(max. 127)
Checksum
CRC16
1 byte 1 byte 2 bytes 2 bytes 2 bytes
Slave
address
Function
0x03 or 0x04
Number of
bytes read
Word
value(s)
Checksum
CRC16
1 byte 1 byte 1 byte x byte(s) 2 bytes
07 03 10 53 00 04 B0BE
07 03 08 0000 41C8 0000 4120 5416
Setpoint 1
(25.0)
Setpoint 2
(10.0)

3 Functions
16
3.2 Write 1 word
In the function Write 1 word, the data blocks for instruction and re-
sponse are identical.
Instruction
Response
Example Write limit for limit comparator 1 = 275
Word address = 0x10CC
Instruction: write the first part of the value
Response (as instruction):
Instruction: write the second part of the value
Response (as instruction):
Slave
address
Function
0x06
Word address Word value Checksum
CRC16
1 byte 1 byte 2 bytes 2 bytes 2 bytes
Slave
address
Function
0x06
Word address Word value Checksum
CRC16
1 byte 1 byte 2 bytes 2 bytes 2 bytes
07 06 10 CC 80 00 2C93
07 06 10 CC 80 00 2C93
07 06 10 CD 43 89 EC05
07 06 10 CD 43 89 EC05

17
3 Functions
3.3 Write n words
Instruction
Response
Example Write the reset time for the first parameter set: Tn1 = 20 sec
Word address = 0x1071
Instruction:
Response:
Slave
address
Function
0x10
Address of
first word
No. of words
max. 127
No. of
bytes
Word
value(s)
Checksum
CRC16
1 byte 1 byte 2 bytes 2 bytes 1 byte x bytes 2 bytes
Slave
address
Function
0x10
Address of
first word
No. of
words
Checksum
CRC16
1 byte 1 byte 2 bytes 2 bytes 2 bytes
07 10 10 71 00 02 04 00 00 41 A0 D627
07 10 10 71 00 02 1575

3 Functions
18

19
4 Data flow
The following describes all the process values (variables) with their ad-
dresses, data types, and type of access.
The abbreviations mean:
R/O read access only
R/W read and write access
char, byte byte (8 bits)
int integer (16 bits)
text character string, consisting of 10 bytes
incl. end-of-string marker 0
Bit x bit no. x
long long integer (4 bytes)
float float value (4 bytes)
The following explanation applies on condition that the master operates
with the IEEE-754 format. Before transmitting a value, the bytes have to
be rearranged, so that their order corresponds to the representation for
MODbus (see diagram).
M = 23 bit normalised mantissa
E = exponent (complement to base 2)
S = sign bit; 1 = negative; 0 = positive
Example:
Transferring the decimal value 550:
MODbus: 0x80, 0x00, 0x44, 0x09
HThe RS422/485 interface is inactive during communication
via the setup interface.

4 Data flow
20