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G7 ASD Multi-Protocol Communication Option and PG Feedback Option Manual
16
2. Change parameter F890 from its current setting of “0” to “1” to select Modbus RTU
communications. Press the “ENTER” key on the drive’s panel to write the change. At this
point, the Multicom interface is
still configured for Profibus DP communications
, so
parameters F891 ~ F894 will not be adjustable beyond “0”.
3. Reset the drive (fault the drive and reset it, or momentarily power it off). Now, parameter
F890 is set to 1 during initialization, so the Multicom interface internally configures itself for
Modbus RTU communications.
4. Now when we inspect parameter F891 (now “Modbus baud rate”), the value will be 5.
Therefore, we need to change parameter F891 from its current setting of “5” (9600 baud) to
“7” (38.4kbaud). Press the “ENTER” key on the drive’s panel to write the change. At this
point, the internal Modbus baud rate is
still configured for 9600 baud
(until the next
initialization sequence takes place).
5. Similarly, change parameter F892 (now “Modbus parity & stop bits”) from its factory-default
value of “1” (no parity/2 stop bits) to “2” (even parity).
6. Reset the drive once more. Now, when the drive and Multicom interface initialize, the
Multicom interface will initialize with Modbus RTU communications at 38.4kbaud and even
parity. The network configuration is now completed.
Once the network configuration parameters are configured for a specific network, their settings for that
network will be retained even if a different network is chosen and the second network’s configuration
parameters changed. Continuing with the above example for demonstration, even if a different network
is chosen, and parameters F891 ~ F894 associated with that network are changed, and then Modbus
RTU communications are once again selected by changing parameter F890 to “1”, the Modbus baud
rate will still be set to 38.4kbaud, and the parity will still be set to “even” when drive/Multicom
initialization has completed.
8.1 Profibus DP Configuration
When parameter F890 is selected for Profibus DP communications, no additional network configuration
is required. The additional Network Configuration Parameters, therefore, are unused (refer to Table 5).
Table 5: Profibus DP Network Configuration Parameters
Parameter Function Settings Default Value
F891 Unused N/A (Always 0) 0
F892 Unused N/A (Always 0) 0
F893 Unused N/A (Always 0) 0
F894 Unused N/A (Always 0) 0