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Chapter 5 Communication| CME-PD01
5-10 Revision October 2006, 2006PDD23000013
T1: transmission time between Master and CME-PD01
T2: waiting time for CME-PD01 buffer
T3: transmission time between CME-PD01 and VFD-E
T1 T3
Master
Data Buffer
Timer
CME-PD01
VFD
series
Drives
T2
T1 depends on the actual transmission speed and the type of master in use.
T2 depends on the internal timer of CME-PD01. Data is transmitted to VFD-E series per 70ms
triggered by a timer. User cannot change the time-out interval.
T3 depends on the Modbus communication between CME-PD01 and VFD-E series.
So the response (refresh) time is,
Max. response (refresh) time = T1 + T2 (70ms) + T3
In fact, the actual response (refresh) time is less than the Max. response (refresh) time. When
the data is send to CME-PD01, CME-PD01 will save the data to data buffer. If the timer is in
time-out, the data will be transmitted to VFD-E immediately.