4. Operation
4-25
Table 4-4 Station type list
No. Station type
Specification
Required operation
I/O area
configuration
Transfer area
configuration
Slot information
setting
1
AUTO
I/O, unspecified I/O transfer, and polled
PUT/GET
Required
--
--
2
I/O
I/O and specified I/O transfer
--
--
Required
3
I/O+DR/DW
I/O, specified I/O transfer, and polled
PUT/GET
--
--
Required
4
DR/DW
Polled PUT/GET only
--
--
--
-
Timeout time of station
Set the length of time for which the station monitors the refresh cycle of the J.NET module. This refresh
cycle must be at least five times longer than the NET1 (NET2) refresh cycle setting. If a substation
registered with the same network cannot communicate properly due to, for example, power failure or
disconnection, the refresh cycle of the J.NET module is prolonged. This might cause a communication
error in another substation that is communicating normally. To prevent this communication error, set the
value calculated by using the formula indicated in
Table 4-5 Station timeout calculation formula for
different communication speeds
.
Table 4-5 Station timeout calculation formula for different communication speeds
No. Communication
speed
Setting (N denotes the number of stations registered)
1
125 kbps
{(
N
-1)
x
128[ms] + (NET1(NET2) refresh cycle time [ms])}
x
5 or more
2
250 kbps
{(
N
-1)
x
64[ms] + (NET1(NET2) refresh cycle time [ms])}
x
5 or more
3
500 kbps
{(
N
-1)
x
32[ms] + (NET1(NET2) refresh cycle time [ms])}
x
5 or more
4
1 Mbps
{(
N
-1)
x
16[ms] + (NET1(NET2) refresh cycle time [ms])}
x
5 or more
Setting range
0 to 65535
(1 unit = [10 ms])
If you set 0, refresh cycle monitoring is suppressed.
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