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Commissioning
When the Lock Security (bit 1) is set, the drive drops out of NETWORK control and
switches to the normal source of control. If P100 = 3 (NETWORK ONLY) and the drive is
running, the drive will also be stopped (according to P111).
Drive parameters and status registers can always be read, even when P100=2,5 and/or
drive control and parameters are locked.
Stop commands (STOP, QUICK STOP, INHIBIT) will always be accepted, even when
network control is not enabled or drive controls are locked.
7.4
Network Watchdog Timer
The drive is equipped with a network communications watchdog timer. If the Modbus
Master wishes to control the drive (start, forward, reverse, etc.) it must first Unlock
Controls (see Section 7.3). If the watchdog timer is enabled (i.e. P426 is not set
to IGNORE) and drive controls have been unlocked, the Master must periodically
communicate with the drive or a watchdog time-out will occur. The watchdog timer does
not operate unless Controls have been UNLOCKED via Register #48 and a time-out
action (other than IGNORE) has been specified using parameter P426.
7.5
Watchdog Timer Controls
7.5.1
Watchdog Time-out Period (P425)
The maximum amount of time that should be allowed to pass between network messages
to a specific drive will vary from one network to the next. Therefore, we have made the
watchdog time-out period user settable via Drive Programming Parameter P425 (see 4.1
for details).
7.5.2
Watchdog Time-out Action (P426)
The appropriate action to be taken when a watchdog time-out occurs will also vary from
one application to the next. Therefore, we have provided five user selectable time-out
actions which can be set via Drive Programming Parameter P426 (see 4.1 for details).
If the Watchdog Timer has been disabled (i.e. P426 is set to IGNORE), Controls and/or
Parameters must still be unlocked in order to gain write access to the drive control and/or
program parameter registers. However, there are no longer any constraints on how often
the Master must communicate with the drive.
