Panasonic FP2 ET-LAN, Техническое руководство

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13-8
13.3 Reset Function
13.3.1 What is the Reset Function?
The reset function is used to restart only the ET-LAN unit without cutting off the power supply for the
system.
Using the reset function enables the ET-LAN unit to be the operable state when an unrecoverable error
has occurred in the ET-LAN unit.
Also, using the reset function periodically when the ET-LAN unit is not communicating may help to
prevent an accidental communication error.
The no communication notification function is available which is useful to detect the time to execute the
reset function.
13.3.2 No Communication Notification Function
The no communication notification function is a function to notify that communication is not performed
longer than a specified time for the connection opened by the open processing of the ET-LAN unit.
Using the no communication notification function enables to detect the state that the ET-LAN unit is not
communicating.
Use this function when executing the reset function.
Procedure
1. Write a value in the following address of the initial information setting area (Shared memory Bank 0) to
execute the initial processing.
Initial information setting area (Bank 0)
Address Name Default Setting value/Explanation
208H
No communication
connection time type
0000H
Set the base time for the no communication connection detection
timer value.
0000H :
×
2 minutes
Other than 0000H : x 6 seconds
209H
No communication
connection detection
timer value
0000H
Setting time = [Setting value (1 - FFFFH)]
×
[Base time]
- Set the time to detect a no-communication state after connection
establishment.
- The setting value of the above 208H is used as the base time.
- When the setting value is larger than 0064H,
in case of x 2 minutes : 200 minutes
in case of x 6 seconds : 10 minutes
2. When communication is not performed for the period of the specified time-out value, the flags of the
bits corresponding to each connection in the following handshake area (Shared memory Bank 0) turn on.
Handshake area
Expanded
complete request area
2
(Bank 0)
Address BIT Description of signal
366H bit8 No communication time-out signal (Connection 1)
bit9 No communication time-out signal (Connection 2)
bitA No communication time-out signal (Connection 3)
bitB No communication time-out signal (Connection 4)
bitC No communication time-out signal (Connection 5)
bitD No communication time-out signal (Connection 6)
bitE No communication time-out signal (Connection 7)
bitF No communication time-out signal (Connection 8)