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PACMotion VFD Syllabus
GFK-3167B
12.4.5
Modbus TCP Connection Timeout
The VFD Modbus TCP interface allows the user to set the Communication Loss Timeout
and Communication Loss Action values. These parameters are at addresses P5-05 and P5-
06 respectively. The Timeout units are 1 = 0.1 sec and the range is from 0.0 (disable) to
5.0 seconds.
12.4.6
Drive Parameter Access – Direct Address Method
The Modbus Interface allows the user to read/write directly the drive parameters. To
perform this function, the user can directly access the parameter. Simply add the 3-digit
parameter number to the Modbus offset of 400000.
For example:
Read parameter P1-01 (Maximum Frequency), perform the following
Read Modbus TCP Register 400101 value (scaling in 0.1 Hz).
Write parameter P1-01 (Maximum Frequency) = 60.0 Hz, perform the following
Write to Modbus TCP Register 400101 value = 600 (scaling in 0.1 Hz)
12.4.7
Drive Parameter Access – Indirect Address Method
The Modbus interface allows the user to read/write indirectly the drive parameters. To do
this you must use an Index number (Pointer) to point to the Parameter (Value) you want to
access. The Index is at Modbus Address 404131. You must also use the next address
404132 to Read or Write the data desired.
EXAMPLE: Given that the Index pointer = Addr. 404131 and Index Value = Addr. 404132
Read parameter P1-01 (Maximum Speed), perform the following:
Write to Modbus TCP Register 404131 a value = 101 <- Code for P1-01 (reference table)
*Read from Modbus TCP Register 404132 value = Parameter Value in P1-01
*P2-39 Lock/Unlock = will not affect this R/W of Parameters
To Write to P1-01 01 (Maximum Speed) and set it to 1800 rpm, perform the following:
Write to Modbus TCP Register 404131 value = 101 (This moves P1-01 current value into
404132)
**Write to Modbus TCP Register 404132 with the New value = 3600 (scaling in .5 rpm)
eg. 6 = 0.1Hz
**P1-12 must be = 4 for Write capability into a Parameter. This could be done on the VFD
faceplate or with the PACMotion VFD Suite.
PACMotion VFD Fieldbus Option Modules and Setup (Note 8)
Section 12
December 2020
54
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