Differences

This shows you the differences between two versions of the page.

--- blocks:app-note:siemens_logo_modbus [2024-03-20 12:24]
mattias [Introduction]
+++ blocks:app-note:siemens_logo_modbus [2024-03-20 13:19] (current)
mattias [Programming the PLC]
@@ Line 31: / Line 31: @@
 {{:blocks:app-note:logo_modbus:modbus_server_setting.png?800|}}
-  *  Here it is possible to specify connections from a perticular server/servers. In this example i will leave it to accept all connection requests server side.
+Here it is possible to specify connections from a perticular server/servers. In this example i will leave it to accept all connection requests server side.
 {{:blocks:app-note:logo_modbus:modbus_server_prompt.png?800|}}
@@ Line 61: / Line 61: @@
-====Limitations====
+====Temporary limitations====
-Currently (Blocks version 6.3) it is not possible to read holding registers with modern addressing. We added a feature request to add the ability to manually set the modbus function per channel. Currently it is done automatically based on the data type and direction.
+Currently (Blocks version 6.3) it is not possible to read holding registers with modern addressing. We added a feature request to add the ability to manually set the modbus function per channel. Currently this is decided automatically based on the data type and direction.
 To work around this, one can use the classic modicon addressing and translate the Siemens addresses documented in standard modbus address style (modern)  to modicon.
@@ Line 72: / Line 72: @@
 Addresses starting with 4XXXXX will use function 3 (holding registers)
-In this blocks configuration I added the same as in the example above, but I also added a holding register. I want to read that because I programmed a pulse counter in the PLC that outputs to the holding register. This way I can expose the value as a property in blocks and make use of it in any task logic or expose it in content.
+In this blocks configuration I added the same as in the example above, but I also added a holding register. I wanted to read that because I programmed a pulse counter in the PLC that outputs to the holding register. This way I can expose the value as a property in blocks and make use of it in any task logic or expose it in content.
 {{:blocks:app-note:logo_modbus:logomodicon.png?800|}}
+====Programming the PLC====
+It is not that hard to program a PLC, please use online tutorials and Siemens documentation regarding how to create programs.