Alpha 6000 User Manual page 145

Chapter 5 Parameter Introductions
set parameter, you can read monitor content and write function parameter.
Select "serial communication" in parameter P0.01 (Frequency setting 1, P0.01=5) or
P0.02 (Frequency setting 2, P0.02=5), and then the frequency setting command can be
provided by PLC. Writing the value of frequency setting in special register (002H)
can set frequency setting, which is not saved after power off. Or set P0.01(or P0.02)
to 1 modify the value of P0.00 by communication to come true frequency setting.
Set the operating control method in parameter P0.04 to "Serial communication
1(STOP invalid)" (P0.04=3) or "Serial communication 2(STOP valid)" (P0.04=4).
Then the operating command can be provided by PLC;
If the setting value of P7.00 is 4 (Serial communication), the PID feed can set by PLC;
If the setting value of P7.01 is 2 (Serial communication), the PID feedback can set by
PLC.
If serial communication is selected as the frequency setting or run command, then the
commands of reading the running status of inverter, writing run command or
reading/writing parameters are all valid. If frequency setting is set to "serial
communication", frequency command can be preset by communication; if run
command mode is set to "serial communication", the running command send by
communication will be effective. If you want both frequency command and running
command valid, you must select "serial communication" in frequency setting (1 or 2
in parameter P0.01 or P0.02) and run command mode (3 or 4 in parameter P0.04).
Pb.00 MODBUS Baud rate selection
0:1200bps
2:4800 bps
4:19200 bps
Pb.01 MODBUS slave address
Note:
 The slave address number is set. It is necessary to set the address number so that it
will not overlap with the address numbers of other slaves in the network. To make
many inverters and control PLC operate in the network, every inverter has its own
address number. At most 31 inverters whose address numbers are from 1 to 31can
tie to control PLC at the same time. 0 is broadcast address. The slave does not
receive communication command when Pb.01 is set to 0.
Pb.02 MODBUS parity selection
0: Even parity
2: No parity
Pb.03 MODBUS time over detection
Note:
144
Range: 0~5【3】
1:2400 bps
3:9600 bps
5:38400 bps
Range: 0~31【1】
Range: 0~2【0】
1: Odd parity
Range: 0~100.0s 【0.0s】