User`s manual

10-8
Data link DL1 (master station) function
10
10-3 Required transfer time and its timing
[1] Required transfer time
Necessary time (T) to complete transfer from the master station of data link DL1 to the last station
number, in order.
At number of connected stations
≤≤
≤≤
≤ 6 (Number of slave stations
≤≤
≤≤
≤ 5)
At number of connected stations
≥≥
≥≥
≥ 7 (Number of slave stations
≥≥
≥≥
≥ 6)
T = + (1.7P to 3.4P) (ms)
N
153.6
T = + (2.9P to 4.6P) (ms)
N
153.6
When an abnormal station (no response within the rated interval or a station to receiving error message)
exists, the master station (PC00) executes recovery every 3 cycle. Required time to recovery is as
follows:
T
ER
= 0.16PP' + 3.68P' (ms)
P: Number of set stations
P': Number of abnormal stations
Be careful that data sample interval may become longer than normal case due to recovery operation.
N: Total amount of link points
(get the value by multiple number of data link byte with 8 points)
P: Number of connected stations (master and slave stations)
[Example] In case of number of connected stations is 2: (Total amount of link points 64 x 8 = 512 points)
I/O processing
I/O processing
PC processing PC processing
Data exchange Data exchange
PC cycle time
(control section)
Data link master station
(general
communication section)
Data link slave station 1
(PC01)
T
means sending.
means receiving.
JW-32CUM1
T = + (1.7 x 2 to 3.4 x 2) = 6.7 to 10.1 (ms)
512
153.6
Remarks
The time required to exchange data between the JW-32CUM1 control section and the general
purpose communication section is approximately 0.2 ms, maximum.