For Rs485 Communication - INVT Goodrive350 Series Operation Manual

Goodrive350 series VFD Auto Station programmable expansion card Programming cases
As shown in the preceding figure, APPLE may be negative. This is because the system
considers the single D element (APPLE) as an integer during the increase and therefore uses
signed display. The D elements on the Auto Station can be divided into the integer type and
the long integer type, but not the unsigned integer type. The preceding judging zone uses the
hex restriction method. No change can be made for the transfer to P27.12 since the data
showed in P27.12 is an unsigned number.

5.4 For RS485 communication

Requirement: The bus voltage of 2# VFD can be obtained, the input from AI1 on the PLC card
is used to set the frequency for 2# VFD, and PS1 on the PLC card is pressed to run 2# VFD
forward. For 3# VFD on the RS485 cable, the output frequency can be read, and the set
frequency can be changed and can increase automatically by 1Hz.
Figure 5.5 PLC card networking example
Implementing method: The LD is used for programming. On the left of the Auto Station,
expand System block, double-click Serial port, select the parameter settings for PLC
communication port (1), choose the Modbus protocol, and right-click Modbus setting. The
default setting is Slave Station. Change the setting to Master Station, set the site number to
1, and retain other default settings. (Note: For Modbus communication, all other parameters
must use default settings except the site number. This is to keep the same protocol for the two
sides.) Regarding the hardware, short connect AV on the PLC card to J2, and short connect
AVO on the PLC card to J5 (this is the default short-connection). Connect the 485+ terminal
on the PLC card to the 485+ terminals on 2# VFD and 3# VFD, and connect the 485- terminal
on the PLC card to the 485- terminals on 2# VFD and 3# VFD.
VFD function code setting: Set P14.00=2, P00.01=2, and P00.02=4 for 2# VFD. Set P14.00=3
for 3# VFD.
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