Delta PROFIBUS-DP Module for VFD Series Drives PD-01 - Manual (Page 23)

PD-01 PROFIBUS-DP Module
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T1 depends on the actual transmission speed and the type of master in use.
T2 depends on the internal timer of PD-01. Data is transmitted to VFD series Drives per
70ms triggered by a timer. User cannot change the time-out interval.
T3 depends on the Modbus communication between PD-01 and VFD series Drives.
So the update time is,
Max update time = T1 + T2 (70ms) + T3
In fact, the actual update time is less than the Max update time. If the timer time-out
when the data arrive PD-01, PD-01 will save the data to data buffer, and transmit the data
to VFD series Drives immediately.