Host Side Procedures - Fuji Electric FRENIC-AQUA series User Manual

3.2

Host Side Procedures

3.2.1 Inverter's response time
Upon receipt of a query from the host, the inverter executes the queried transaction and sends
back response after the response time shown below:
Host
Inverter
t1: Response interval time
The response interval time is the longest time out of the time setting by a function code(1),
3-character time(2), or inverter's processing time(3).
(1) y09/y19: setting of response interval time
0.00-1.00(s), factory shipment setting: 0.01(s)
You can set the time from receiving a request issued from a host to starting to send a
response. By setting a response interval time, even the host side which is slower than the
inverter can meet timing.
(2) 3-character time (maximum value)
Baud rate (bps)
3-character time (ms)
(3) Inverter processing time (The data volume shown below indicates the number of words.)
1) Read holding registers, read coil status, multiple read holding registers
Data count
1 to 7
8 to 16
n
Query
Response
t1
Table 3.9 3-character time (maximum time)
2400 4800
15 10
Table 3.10 Inverter processing time
Inverter processing time (minimum to maximum)
Int ((n-1)/8)×5 to int ((n-1)/ 8)×5+5 (ms)
3-13
3.2 Host Side Procedures
Query
Response
t2
9600 19200
5 5
5 to 10 (ms)
10 to 15 (ms)
38400
5