kalle

Yes.. And SAIA also have.. http://www.sbc-support.ch/pcd8/pxxx/pcd8p5.htm PG5 1.3.120 version, useable 90 days without a license

Hi Jay "this is the most intelligent answer that I have ever received on this particular subject." I'm not going to ask what the other answers was.... Regarding the spesific valve, I ended up reading/writing all relevant holding registers in a single telegram without making a Read_IEEE_function. The PLC code made all necessary float arrangement after reading / before writing. Link to the valve: http://www.lyng.com/motor/ Other systems supporting IEEE or Modicon floating point format: (quoted) - Visualisation system Staefa, with NIMOD interface - Honeywell TDC 3000 with APM-SI The quoted information was from a modbus driver for the plc brand SAIA PCD. (Swiss). Here is a driver list from the author: http://www.engiby.ch/drivers.htm He/they are productive..., but SAIA PCD is a PLC where it is easy to make drivers. Have done some myself. If you read the Modbus FAQ section, have in mind that a SAIA PCD register is 32 bit and the float format is a Motorola format, not IEEE. Regards Karl Egil