Toshiba G7 - Manual (Page 80)

G7 ASD Multi-Protocol Communication Option and PG Feedback Option Manual 73
11.6 Network Communication Loss Action
ASD Parameter F892 configures the drive’s behavior upon loss of DeviceNet network communications.
For the purposes of setting this behavior, the chosen action will be performed both a result of a
connection (inactivity) timeout as well as a network fatal fault (such as a loss of network power or
network BUSOFF after initial successful network operation).
The primary behavior of the network interface and drive upon loss of communications is dictated by the
setting of attribute #12 (watchdog_timeout_action) in the polled I/O connection object of the connection
class. The polled I/O connection’s watchdog_timeout_action can take on the following three values:
0: Transition to timed out. This is the default value. The connection transitions to the “timed out”
state and waits in this state until the connection is reset or deleted.
1: Auto delete. The connection is automatically deleted.
2: Auto reset. The connection remains in the “established” state and the inactivity/watchdog timer is
restarted.
When the polled I/O connection’s watchdog_timeout_action attribute is configured with a value of
either 0 (transition to timed out) or 1 (auto delete), the drive’s behavior upon loss of communications is
controlled by the setting of ASD parameter F892. When the polled I/O connection’s
watchdog_timeout_action attribute is configured with a value of 2 (auto reset), no drive action occurs
during a timeout condition (the drive continues to operate at its last conditions).
By appropriately configuring ASD parameter F892, therefore, it is possible to create a solution that can
provide some level of system “failsafe” operation in the event of master loss or total network failure.
SAFETY WARNING!
Because some of these settings will enable the
drive to run automatically, the user must ensure that their system poses no
danger of personal injury or equipment damage, as they may no longer be able
to control the drive from the network due to the loss of communications.
ASD parameter F892 provides the following selections (also refer to Table 7 on page 18):
0
= Set all consumed data to 0
1 = Retain last data values
2 = Issue STOP command to drive
3 = Issue EMERGENCY OFF command to drive
4..18 = Run preset speed #1..#15
Setting “0”: This is the default setting. When network communications are lost, the consumed I/O data
will be set to 0. This will have the effect of stopping the drive and setting its frequency command to
0.00Hz. Note that the drive will not react to the effective STOP command, etc. unless the drive’s
command mode selection parameter is set to use the option card as its command source.
Setting "1": The last consumed data is retained.
Setting "2": A STOP command is issued to the drive. Note that the drive will not react to the STOP
command unless it is operating from the network command source at the time of the watchdog timeout.
Setting "3": An EMERGENCY OFF command is issued to the drive. Note that the drive will not react
to the EMERGENCY OFF command unless it is operating from the network command source at the
time of the watchdog timeout. The drive’s behavior during an EMERGENCY OFF event can be
configured via ASD parameter F603.