Slave/Data Block configuration

Fixed_Image

Parameter	Description
Request	Area for Request description.
Description	Free definable name. Default: empty
Data read by master	Defines the MODBUS function code used.
Input Bits	Bits read by external masters (function code 2 Read Discrete Inputs). Default: active
Input Registers	Words read by external masters (function code 4 Read Input Register). Default: inactive
Data read or forced by the master	Defines the MODBUS function code used.
Coil Bits	Bits forced by external masters (function code 5 Write Single Coil or 15 Write Muliple Coils). Default: inactive
Holding Registers	Words forced by external masters (function code 6 Write Single Register or 16 Write Multiple Registers). Default: inactive
Data block	Each data block is identified by a MODBUS base address and a number of items (bits or words).
Base address	Start address of the data block in the MODBUS table. Default: 1
Nb Item	Amount of data in the data block. Depending on the selected function code type bits or words. Default: 1
Declare varibles	Allows to declare variables for the data block following the address sceme of the function code Default: inactive
Prefix	% is the placeholder for digits. Example: V%%% = V000 Default: V%
Datatype Dropdown menu	Allows to select predefined Datatypes according to the setting in the MODBUS Request area. Default: BOOL
From	Startnumber for automatic naming (digits) Default: 1

Attention

Read and write requests sent by MODBUS masters will be denied if the range specified in the request does not fit within a data block defined in the configuration. Requests overlapping two data blocks will be denied.
For example, if you configure a block of 16 words starting at address 1 and another block of 16 words starting at address 17, a request for read or write of 32 words starting at address 1 will be denied and an "address error" exception will be reported.

When a server data block is selected, use the Edit / New variable command to map a variable to an item of the data block.

Close dialog

Option	Description
OK	Applies settings and closes the dialog.
Cancel	Discards all changes and closes the dialog.

Slave/Data Block configuration

IEC 61131-3 Automation platform > Drivers - Fieldbus configuration > MODBUS Slave > Fieldbus configuration > Settings in the fieldbus dialogs > Slave/Data Block configuration

Created with the Personal Edition of HelpNDoc: Why Microsoft Word Isn't Cut Out for Documentation: The Benefits of a Help Authoring Tool