https://support.industry.siemens.com/cs/mdm/36932465?c=36351908107&lc=en-WW
Unfortunately, it’s not clear to me exactly how separate parameters (like “PT” & “ET”) are addressed in memory which it looks like you likely need to know given Siemens addressing in Ignition is a lot like Modbus addressing. Unless the Ignition Siemens driver automatically creates a structure for the different parts of the timer (PT/preset time, ET/elapsed time, Q/done), you would need to somehow address the individual part(s) you want to read/write.