Components > Driver > Modbus Master

Import / Export

This function simplifies the creation of channels, as each channel does not have to be created individually in the channel editor.

It is important that the document to be imported is an XML file with the correct formatting. The easiest way is to create a channel, export it, edit/add to it and then import it again.

Example XML file structure:

<?xml version="1.0" encoding="utf-8"?>

...

</ModbusChannelList>

Channels

Device name	Device ID [0 - 247]	Function	Register Address [decimal]	Data type	Number of registers	Factor	Offset	Min valid value	Max valid value	Unit	Send zero on read error	Triggers "write all"
Channel001	1	Read coil (1)	0	Bit	1	1	0	0	0
...

Columns marked with (*) can be edited together. The rows must be selected for this.

Name	Description
Name	Name of the channel which is displayed in the Dynamic folder in the communication window. Subfolders can be created with #, whereby the text before # is the folder name and the text after # is the data point name. This allows data points to be summarised. Example: Current#L1; Current#L2; Current#L3 - A Current folder containing the data points L1; L2; L3 appears in the Dynamic folder.
Device ID [0 - 247]	Device ID assigned in the device settings of the Modbus device, each device must be assigned its own ID so that it can also be uniquely identified. Not applicable for most Modbus-TCP connections. A broadcast is sent to all devices via ID 0.
Function	Various function codes are used to query values. The code is normally given as text and number in brackets. The number code is always unique. The required function code must be selected according to the product manual.
Register Address [decimal]	Address of the start register, from here the values are read or written. The address must be given in decimal, in the assignment tables these are often given in HEX. The conversion can be done e.g. via the Excel function "=hex2dec" or the Windows computer (view\programmer).
Data type	The specific data type for the registers, inputs, outputs, etc. to be read out. If the data to be read out is represented in several registers, the data type must be adapted accordingly.
Number of values	Number of registers to be queried (mostly for texts).
Factor	The read-out values can be directly provided with a factor. The factor also applies to writing to the registers. From master to slave is divided, from slave to master is multiplied.
Offset	An offset can be set for the result, e.g. for temperatures.
Min valid value	Setting to output only permissible values between this minimum value and the maximum value. Invalid values are not output at the data point (only at the diagnostic output). If Min and Max value is 0, the limit value is ignored. The output at the data point also depends on the setting"Send zero on read error".
Max valid value	Setting to output only permissible values between the minimum value and this maximum value. Invalid values are not output at the data point (only at the diagnostic output). If Min and Max value is 0, the limit value is ignored. The output at the data point also depends on the setting"Send zero on read error".
Unit	The unit of the value can be entered here. This is output as text in the folder Dynamic --> Unit.
Send zero on read error	If the specified register cannot be read or can no longer be read, the output is set to undefined.
Write Trigger All	If this option is set for one channel and it is written to, all other writable registers are also rewritten. Without this option, only this one register is written.

Method	Data type	Service	Service code	Access	Remark
Bitwise	Outputs/coils	Read coils	1	Read (read)	Read digital outputs (e.g. relays)
Bit by bit	Outputs	Read discrete input	2	Read (read)	Read digital inputs
Word by word	Output	Read internal register (holding)	3	Read (read)	Read measured values, counter readings, average values, Reading the device configuration
Word by word	Outputs	Read input register (Input)	4	Read (read)	Read analogue inputs
Bit by bit	Inputs/coils	Set coil	5	Write (write)	Writing a digital output (e.g. relay)
Word by word	Inputs/coils	Write register	6	Write (write)	Writing values Writing device configuration
Bit by bit	Inputs	Set multiple coils	15	Write (write)	Write several digital outputs (e.g. relays)
Word by word	Inputs	Write several internal registers	16	Write (write)	Writing multiple values
Word by word	Bidirectional	Read/write internal register	3/6	Read/Write (read/write)	Read and write a value
Word by word	Bidirectional	Read/write multiple internal registers	3/16	Read/Write (read/write)	Read and write multiple values
Bit by bit	Bidirectional	Coil read/write	1/5	Read/Write (read/write)	Read and write a digital output
Read/write coils	Bidirectional	Read/write multiple coils	1/15	Read/Write (read/write)	Read and write from multiple digital inputs/outputs.
Word-by-word/bit access	Outputs	Input register Bit access reading	4	Read (read)	Reading analogue inputs The values are output or set on the EisBaer side in individual bits.
Wordwise/bit access	Bidirectional	Internal register Bit access read/write	3/22	Read/Write (read/write)	Reading and writing measured values, counter readings, average values, reading and writing the device configuration The values are output or set on the EisBaer side in individual bits.
Bit by bit	Bidirectional	Multiple internal registers Read/write bit access	3/6 3/22	Read/Write (read/write)	Read and write multiple values as bit access