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Class
The class field indicates the product classes that support the
transaction. The product codes are as follows:
E
= Encoderless Vector
I
= Inverter
S
= Servo
V
= Vector
V*
= Vector with custom software for positioning
Note 3: Network Watchdog Timer
The network watchdog timer is used by the drive to detect a communications
loss. Normally, this functions as follows: On initialization/power up, the
Watchdog Time = 0 (disabled). If any value other than 0 is written to the
Watchdog Time, the timer activates. Thereafter, every time a network command
is received, the internal timer is reset. When the time between network
commands exceeds the value stored in this register, the control faults and
disables the motor. The host must continuously send commands to keep the
timer reset (a NULL command – a write to register 41000 – can be sent, if
desired). Writing the watchdog time back to 0 disables the timer.
Note 4: Watchdog Polling Flag
If the Watchdog Polling Flag is set to 0, no automatic polling will take place. The
Network Watchdog will function normally. If the Watchdog Polling Flag is set to 1,
automatic polling will take place. This means that the Modbus Plus card will send
NULL transactions to the Motor Drive every 20ms or so, as long as there is valid
Modbus Plus communications (which means that there is at least one other
Modbus Plus device on the network to pass the token to, and communications
with that device are valid). This will keep the Network Watchdog timer from
expiring unless the Modbus Plus network itself goes down.
5-10 Software Setup
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