Description Modbus logo

The Modbus protocols allows the exchange of data with a wide range of industrial devices and many supervisors. The Modbus 2 library from Engiby sàrl supports the following Modbus protocols:

  • ASCII + RTU over serial lines RS 232, 422 and 485
  • TCP + UDP over Ethernet

Both, master and slave functions are included in the library and several master and several slave drivers can run simultaneously on the Saia PCD®.
The library is available in form of S-Fup FBoxes for Fupla programmers. For the use in IL or Graftec the library provides an interface using FBs which can be called. For a detailled description of the features and Getting Started examples follow this link.


The Modbus library is now available with the NG-Configurator and Excel. It is especially useful for big projects. The NG-Configurator allows you to define a long list of sending and receiving transmissions in an Excel file instead of placing Fboxes in a Fupla file. Each transmission can have different parameters like, an enable flag, a single or cyclic mode, different modbus functions, a format conversion, etc. You also have the possibility to retrieve a large amont of data in one single transmission to a buffer and then spread them in different flags and registers using different format conversions.

Don't hesitate to contact us for more information.


Modbus Fbox library compatible with
  • PG5 V
  • PG5 V
  • PG5 V
  • PG5 V
  • PG5 V

CHF 750.--
Maximum 3 license keys

Additional license key for a new PG5 version, if purchased or updated within less than 1 year Free Free
Update from any version to actual version including new license key *
Update service
CHF 400.-- Euro
Additional license keys, maximum 3 license keys CHF 400.-- Euro
NG-Configurator library as an extension to the Modbus Fbox library * CHF 500.-- Euro

* Modbus update for PG5 V 2.3 including NG-Configurator
Special offer until end of 2019

CHF 750.--       Euro


The documentation is included in the library as Widows Help file in English. A detailled description of the features of the Modbus2 driver can be found in the Modbus 2 Driver details.

Further information

The following links point to further useful documents about Modbus libraries.

Old Modbus 1 library

The Modbus 1 driver is now obsolete. If you start a new application with Modbus please use the Modbus 2 package above.
For upward compatibility of existing applications on PG5 2.0, 2.1 and 2.2, you can install a Modbus 1 package as extension to Modbus 2 and keep your applications unchanged.
Procede as follow: