PACMotion VFD Syllabus
Section 7
GFK-3167B
December 2020
User Defined Function Block
–
PROFINET (Note 6)
24
4.
Connect the VFD to the Modbus/TCP Device and power up the devices.
5.
Load in the example PAC Machine Edition project:
VFD_ModbusTCP_QPPlus12_VerX and Download/Run the QuickPanel or the Laptop in
Simulate mode.
6.
Set the required VFD terminal discrete signals properly to allow VFD operation.
DI1 = ON (Enabled) and STO = ON (Safe Torque ON)
Demo Case File:
VFD_ModbusTCP_QPPlus12_Ver2.zip
To download all demo case files, please visit:
https://emerson-mas.force.com/communities/en_US/Documentation/PACMotion-VFD-
Syllabus-GFK-3167
Modbus/TCP Process Data Exchange
The mapping of Process Data Output/Input to Modbus/TCP Registers is shown below.
Process Data Word
Modbus RTU Register
3
PDO1
300001
PDO2
300002
PDO3
300003
PDO4
300004
PDI1
400001
PDI2
400002
PDI3
400003
PDI4
400004
3
Modbus/TCP Clients may address the first Modbus/TCP register as register 300001/400001. This assumes an address offset starting at
1. For Clients that use zero based addressing just subtract 1.