Panasonic HD-PLC DA-PU100, Administrator'S Manual

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DA-PU100 Series Administrator's Manual
56
4.4.4 Command response time when using HD-PLC
Transfer of RS-485 frame by HD-PLC is performed as shown in the timing chart below.
485 TransferTime (T
485
): Time when the 485-Master transmits one frame of data
Example) Serial Comm (9600bps, Data 8bit, Parity enable, Stop 1bit)
Frame Config (data 32byte)
( ( 1 + 8 + 1 + 1 ) x 32 ) / 9600 = 36.7msec
・・
Time when data is made the shortest
MHP TransferTime (T
MHP
): Time required for multi-hop
Time for 1 hop: approx.10msec
In the case of PLC-Terminal to PLC-Terminal, it is necessary to take into consideration that
PLC-Master is passed once.
Example)
In the topology as shown on the right,
the number of hops between 485-Master
and 485-Slave is 2 hops,
10msec x 2 = 20msec
Slave Process Time (T
slave
): Time until 485-Slave receives data and returns response
It depends on customer's unit specifications.
Slave Process Time can be calculated;
Response Time(T
resp
)
T
resp
= T
485
x 3 + T
MHP
x 2 + T
slave
For above example;
=36.7msec x 3 + 20msec x 2 + T
slave
= 150.1msec + T
slave
485 Trans- time
MHP Trans- time
485 Trans- time
Slave
Trans- time
485 Trans- time
485 Trans- time
485-Master
485-Slave
485-Master
Transfers
485-Slave
Transfers
Inter PLC
Transfers
485-Slave
Transfers
485-Master
Transfers
Command response time
MHP Trans- time Inter PLC
Transfers