JUMO IPC 300 User manual

70905100T92Z001K000
V1.00/EN/30048311/2023-02-25
JUMO IPC 300
Electronic transformer
Modbus interface description

Contents
Contents
1 Introduction . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
1.1 Preface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.2 Safety information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.2.1 Warning symbols. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.2.2 Note signs . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .5
1.3 Display types. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.4 Available interfaces. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.5 Identifying the device version . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
1.6 Connection of the interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
1.7 Terminating resistor of the RS422/485 serial interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . .7
1.8 Configuration. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.8.1 Baud rate . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.8.2 Data format . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.8.3 Device address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
1.8.4 Minimum response time . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .8
2 Protocol description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 9
2.1 Master-slave principle . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.2 RTU transmission mode . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.3 Device address . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .9
2.4 Chronological sequence of communication . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .10
2.5 Error handling . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
2.6 Detection of bus errors . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
2.7 Checksum (CRC16) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .12
3 Functions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 13
3.1 Reading n words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.2 Writing one word . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .13
3.3 Writing n words . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .14
4 Data flow . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
4.1 Transmission formats . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.1.1 Integer values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.1.2 Floating-point values. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
4.1.3 Character strings (texts) . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .15
5 Address tables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 17
5.1 Device data . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
5.1.1 ID . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
5.1.2 Operating level parameters. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .17
5.2 Input and output variables. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
5.2.1 RMS measured values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18
5.2.2 Analog values . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .18

Contents
5.2.3 Digital inputs/outputs. . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
5.2.4 Controller . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
5.2.5 Device states . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
5.2.6 Binary signals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .19
5.2.7 Errors and malfunctions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .21
5.2.8 Controlling the analog output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .22
6 Specification of values via interface . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 23
6.1 Setpoint specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
6.2 Controlling the analog output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
6.3 Controlling the digital output . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .23
6.4 External inhibit input and external digital input 1 and 2. . . . . . . . . . . . . . . . . . . . . . . . . . . . .24

5
1 Introduction
1 Introduction
1.1 Preface
Read this operating manual before putting the device into operation. Keep the operating manual in a
place that is accessible to all users at all times.
Your comments are appreciated and may assist us in improving this operating manual.
Warranty
All necessary settings are described in this operating manual.
Manipulations not described in the operating manual or which are expressly forbidden will jeopardize
your warranty rights.
If you have any problems, please contact the nearest branch office or the head office.
Service
For service addresses see back cover
1.2 Safety information
1.2.1 Warning symbols
WARNING!
This symbol in connection with the signal word indicates that personal injury may occur if the respective
precautionary measures are not carried out.
CAUTION!
This symbol in connection with the signal word indicates that material damage or data loss will occur
if the respective precautionary measures are not taken.
CAUTION!
This symbol indicates that components could be destroyed by electrostatic discharge (ESD = Electro
Static Discharge) if the respective cautionary measures are not taken.
Only use the ESD packages intended for this purpose to return device inserts, assembly groups, or as-
sembly components.
1.2.2 Note signs
NOTE!
This symbol refers to important information about the product, its handling, or additional benefits.
Footnotes
Footnotes are remarks that refer to specific parts of the text1. Footnotes consist of two parts: A marker
in the text, and the footnote text. The markers in the text are arranged as consecutive superscript num-
bers.
REFERENCE!
This symbol refers to additional information in other sections, chapters, or other manuals.
FURTHER INFORMATION!
This symbol is used in tables and indicates that further information is provided after the table.
&

1 Introduction
6
Command sequence
Config level -> Power controller -> Operating mode
Small arrows between words are designed to make it easier to find parameters in the configuration level.
1.3 Display types
Hexadecimal number
0x0010
A hexadecimal number is identified by a "0x" prefix (in this case 16 decimal).
1.4 Available interfaces
The setup interface on the front (USB connector type B Micro 5-pole) is provided in every device.
An RS422/RS485 interface (4-pole screwed connector) must be stated in the order.
This operating manual only describes communication via the RS422/485 interface using the Modbus
protocol.
1.5 Identifying the device version
Only devices with a 54 in the order code (5) are equipped with the RS422/485 interface.
On the device
1. Press PGM.
2. Select the "Device info" menu item and press PGM.
DISPOSAL!
At the end of its service life, the device and any batteries present do not belong in the trash! Please en-
sure that they are disposed of properly and in an environmentally friendly manner.

7
1 Introduction
1.6 Connection of the interface
1.7 Terminating resistor of the RS422/485 serial interface
To ensure problem-free operation of several devices in a line structure, their internal terminating resistors
must be activated at the beginning and end.
1. Disconnect the device from the supply voltage
2. Open the housing
Bus terminating resistor active
Press all 4 switches up.
No bus termination (default setting)
Press all 4 switches down.

1 Introduction
8
1.8 Configuration
The configuration is set either on the device or using the setup program.
1.8.1 Baud rate
9600 baud, 19200 baud, or 38400 baud
1.8.2 Data format
Number of data bits-Number of stop bits-Parity:
•8-1-none
• 8-1-even
•8-1-odd
•8-2-none
1.8.3 Device address
The device address must lie in the range 1 to 255.
Address 0 is reserved for broadcast messages, i.e., the instruction is executed by the IPC 300 but not
answered.
If an instruction with the device address 255 is received in the device, it will always be processed, even
if a different device address has been configured.
If a device address of 0 is configured, the power controller will not signal a bus error if it has not received
an instruction for 10 s.
1.8.4 Minimum response time
A value within the range 0 to 500 ms can be entered here.
After receiving a Modbus instruction, the specified period of time must first elapse before the response
is sent to the master. The parameter should be used for the RS422/485 interface if the master or one of
the other slaves connected to the bus needs a certain period of time to switch from transmit to reception
mode.
A set time of 0 ms means that the IPC 300 responds as quickly as possible. This setting should be de-
ployed when using the RS422/485 interface.
chapter 2.4 "Chronological sequence of communication", Page 10

9
2 Protocol description
2 Protocol description
2.1 Master-slave principle
Communication between a PC (master) and a device (slave) with Modbus takes place according to the
master/slave principle in the form of 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 RTU transmission mode
RTU mode (Remote Terminal Unit) is used as the transmission mode. Data is transmitted in binary for-
mat (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 the characters that are transferred. The following options are
provided for the data format:
2.3 Device address
The device address must lie in the range 1 to 255.
Address 0 is reserved for broadcast messages, i.e., the instruction is executed by the IPC 300 but not
answered.
If an instruction with the device address 255 is received in the device, it will always be processed, even
if a different device address has been configured.
If a device address of 0 is configured, the power controller will not signal a bus error
if it has not received an instruction for 10 s.
NOTE!
A maximum of 31 slaves can be addressed via the RS485 interface.
Two different options are available for data exchange:
Query
Data request/instruction by the master to a slave via the corresponding device address.
The addressed slave responds.
Master
Slave 1 Slave 2 Slave n
Data word Parity bit Stop bit
1/2 bit
Number of bits
8-bit - 1 9
8-bit even 1 10
8-bit odd 1 10
8-bit - 2 10

2 Protocol description
10
Broadcast
Instruction from the master to all slaves via device address 0. The connected slaves do not respond.
This makes it possible to transfer a specific setpoint value to all slaves, for example. In such a case, the
correct acceptance of the value by the slaves should be checked by a subsequent readout of the setpoint
value.
A data request with device address 0 does not make sense.
2.4 Chronological sequence of communication
Time diagram
Example of the chronological sequence for communication based on 1 Modbus master (e.g., SCADA
software on a PC or a PLC) and 2 IPC 300s as Modbus slave 1 and Modbus slave 2:
t1
Identifies the end of the request:
According to the Modbus specification it is at least 3.5 times as long as the transfer time for 1 character,
depending on the baud rate. In the IPC 300 the time is:
• at 9600 baud: 4.1 ms
• at 19200 baud: 2.1 ms
• at 38400 baud: 1.1 ms
t2
Internal processing time:
The time required by the power controller to process the request it has received and prepare the re-
sponse. In the IPC 300 it is typically 1 to 3 ms and a maximum of 6ms.
t3
Identifies the end of the response:
Same duration as t1.
Chronological sequence
The master sends a data request for slave 1. After the last character is sent, all connected IPC 300
slaves wait for a time of t1. Then the instruction is evaluated.
Slave 2 discards the instruction because the device address does not match. On the other hand, slave
Data request
(for Slave 1)
Response
t
Data request
t
1t2t3
Slave2
Master
Slave1
UART:
UART:
UART:
Receive
Receive
Receive
blocked
Receive
Send
Send
Receive
Receive