The INVALIDATE statement marks a variable to be read from the device as soon as possible. It can be used if for instance a general mode setting has been changed at the device - requiring all parameter depending on this mode to be updated. INVALIDATE bypasses the delayed read back mechanism controlled by the config.readBackDelay setting, forces the read back in the same cycle if the GET procedure for the variable is located after the INVALIDATE statement within the driver.
For the INVALIDATE statement, use the keyword INVALIDATE followed by the name of the variable to be invalidated.