Specifications

Application Note 105U-G-PR2 Profibus Master
Issue 1.2 – May 2005
©ELPRO Technologies Pty Ltd
Page 12 of 13
app_105U-G_PR2_1.2.doc
Register 4307 has a hex value of FFFF indicating that the Digital Input 8 is on. This will be then
written to the Fieldbus location setup in the Fieldbus Config.
If option b) Write Image array is selected then the register location that you want to write to is
entered in along with the value that is to be written.
In this example Digital
Input 7 (Reg 4306) is
used and value of FFFF
will indicate the Digital
input is on.
NOTE: For this example when using the write image array function for the local Digital I/O
on the Gateway the output on the slave device will toggle on then off as the internal structure
sees the value written as on (FFFF) then immediately after in the next scan of the I/O
database it reads it as an off (0000). If using any other I/O register location the output will
stay on at the slave device until the off value is written into the register location again.
The Enable and Disable Fieldbus Read and Write areas are used when diagnostics are needed for
configurations over the radio network. If you can read values from the slave device but are not