Refresh rate
Data stored in the Modbus addresses is refreshed at the following maximum rates:
Table 17.1
Modbus data refresh rates
Data
Maximum refresh rate
Function group example
AC measurements
20 ms
[Source] ACM measurements
Values
40 ms
Alarm parameter: Enable
17.3 Modbus tables
17.3.1 Download Modbus tables
To download the Modbus tables, follow these steps:
1. Visit the DEIF website at:
2. Use the search option
to open the search box:
•
3. Enter the product name.
4. Select the product from the search results.
5. On the product page, select
Documentation
:
•
6. Under the section
Documents
, select
+ Modbus tables
:
7. Select the Modbus tables for your product to start the download.
17.3.2 Modbus table overview
The Modbus tables are stored in a Microsoft
®
Excel file that contains five spreadsheets with Modbus data. The table below gives a
short description of each of the spreadsheets in the file.
Table 17.2
Modbus table spreadsheet overview
Spreadsheet name
Description
Descriptions
This spreadsheet contains an overview of the other four spreadsheets. The information includes a
description of each function group listed in the tables spreadsheets.
Discrete output coil
You can read or write information to the addresses that are listed in this spreadsheet. Use Modbus function
code 01 to read whether a coil is on or off. Use Modbus function code 05 or 15 to toggle the coil value.
Read-only addresses will return a 0 value if you try to write to them.
Discrete input
contact
You can only read information from the addresses that are listed in this spreadsheet. Use Modbus function
code 02 to read whether the contact is on or off.
Output holding
register
You can read or write information to the addresses that are listed in this spreadsheet. Use Modbus function
code 03 to read the information stored at the requested Modbus address(es). Use Modbus function code 06
or 16 to write information to the Modbus address(es). Read-only addresses will return a 0 value if you try to
write to them.
Input register
You can only read information from the addresses that are listed in this spreadsheet. Use Modbus function
code 04 to read the information stored at the requested Modbus address(es).
Controller text
This spreadsheet contains an overview of texts associated to Modbus output values. This association is
only available for selected Modbus addresses.
DESIGNER'S HANDBOOK 4189340911K UK
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