Hello everybody,
I have a Yearly Timer in an app running on LOGO! 8.FS4.
I have mapped the ON YEAR parameter of the Yearly Timer at address 0 and ON TIME parameter of the Yearly Timer at address 2.

Even if in "LOGO!Soft Comfort Online Help" ON YEAR value is declared R/W, I can correctly read it by modbus protocol, but I can not write it - I can read and write ON TIME value mapped at address 2

When I try to set ON YEAR value, I don't receive any modbus error calling modbus FC6 or FC16 function. 
The same thing happens with ON TIME value, but this latter is set.

Is the Yearly Timer ON YEAR value really writeable via modbus?
Thank you in advance

Hello,

inside the zip file, you can find lsc and png snapshot of mapped addresses

Thank you

Your parameter VM mapping table shows in the first entry that you are writing the value for "ON Year" to byte VB0. However, you need to write the value to VB1. VB1 is the right byte of VW0.