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Use Modbus Function Code 16 "Write Multiple Registers" for PLC output data.
PLC Output data starts at register address 40001.
Use Modbus Function Code 03 "Read Holding Registers (4x)" for PLC input data.
PLC Input data is broken up into blocks of three words starting at 40004 and 40010.
For both, check the boxes for "Address in Cell" and "PLC Addresses (Base 1)".
Then click "Connection" from the top menu, and select "Connect".
The window below will appear.
Connection is via Serial Port. Select the COM port of interface you are using to connect to the drive. If you are using a
USB to Serial adapter, this will be the COM port assigned to that device. The other serial settings with regard to Baud rate,
number of data bits, parity, etc. are set to match the drive defaults. Enter them in exactly.
You may also need to go into your Device Manager and edit the properties of the USB to Serial converter to match the
above settings.
Click OK to begin communication.
The packet counters at the top of the windows begin to increment. This indicates that data is being sent to, and received
from, the drive.
You should also be receiving a "live" bus voltage value now too. (Looking at a value that constantly changes like bus voltage
is a good way to verify working communication.)
F-4 ModbusRTU Setup
Figure F-3
Figure F-4
3AXD50000011888
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