User`s manual

11-10
Data link DL9 (master station) function
11
11-3 Required transfer time and its timing
[1] Required transfer time
Required time (T) for the data link DL9 master station to communicate with all slave stations.
T = +1.5P+  (ms)
N
153.6
N: Total amount of link points
(get the value by multiple number of data link bytes with 8 points)
P: Number of connected slave stations
α: Data exchange time between the JW-32CUM1 general purpose communication section (data link DL9
master station) and the control section: (about 6 ms in max).
I/O
processing
I/O
processing
PC processing
Data exchange
PC processing
Master station
PC I/O cycle
Master station
Slave station 1
Slave station 2
To slave station 1 To slave station 3To slave station 2
Sending Receiving
Sending Receiving
Tc
(general purpose
communication section)
JW-32CUM1
(control section)
Remarks
- When the JW-32CUM1 (master station) is a master station, the data exchange with the JW-
32CUM1 control section is once per communication cycle.
- Communication cycle starts from data exchange with the control section. Thus, waiting time
occurs in each communication cycle.
- When a slave station has an error, the JW-32CUM1 (master station) operates an error recovery
procedure in every 3 communication cycles. In this case, error recovery time T
ER
becomes longer.
T
ER
= 4P' ms [P': Number of error slave stations]
I/O processing
Data exchange
Do not exchange
data here
Data
exchange
Waiting time
(1 cycle communication)
Master station
PC I/O cycle
(Communication cycle)