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6.4 Communication Cycle
The SV.LINK communication cycle is determined by the transmission/reception word count,
communication delay time, and MELSEC response time.
The communication cycle calculation formula is shown below:
Communication cycle (ms) = transmission process time (ms) + reception process time (ms) +
communication delay time (ms) + MELSEC response time (ms)
Transmission process time
and reception process time: Determine these values from the following "SV.LINK
Communication delay time: Determine this value as indicated in "5.5.2 Communication delay
MELSEC response time: This value depends on the MELSEC application program. Refer to
Example: Communication cycle in situations where 256-word transmissions and 256-word
receptions are performed at a communication delay time setting of 50 ms
Communication cycle (ms) =
10 + 4 + 50 + MELSEC response time = 64 + MELSEC response time (ms)
The following graph shows SV.LINK's transmission and reception process times. Characteristic
curve (a) in the graph indicates that the transmission process time is about 10 ms when the
transmission word count is 256 words. Characteristic curve (b) indicates that the reception
process time is about 4 ms when the reception word count is 256 words.
12
11
10
9
8
7
6
5
4
3
2
1
0
0
32
transmission/reception process time" graph.
time setup."
the MELSEC documentation.
Values determined from the graph below
SV.LINK transmission/reception process time
64
96
128
Transmission/reception word count
6-13
Transmission process
Reception process
160
192
6 USER GUIDE
(a)
(b)
224
256
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