Appendix D: Using GS4 AC Drives with AutomationDirect PLCs
Page D–11
DuRApulse GS4 AC Drive User Manual – 1st Ed, Rev A - 10/20/2017
Before starting to control the drive or to write to critical parameters, you should ensure that you
are addressing the correct values. To check that your PLC is pointing to the correct location, read
and write from a non-critical parameter. A good example is P1.07, Acceleration Time 4. As you can
see in the Parameter Summary Table (partial from Ch 4 shown below), the Modbus address for
P1.07 is 0107H or 40264 decimal (The hex address = the parameter number).
Parameter Summary Table (Excerpt from Table in Ch4)
Parameter Description Range
Run
Read/
Write
MODBUS Address Settings
HEX Decimal* Default
P1.06
Deceleration Time 3
P1.15=0: 0.00~600.00 sec
P1.15=1: 0.0~6000.00 sec
R/W 0106H 40263 10.00
P1.07
Acceleration Time 4
P1.15=0: 0.00~600.00 sec
P1.15=1: 0.0~6000.00 sec
R/W 0107H 40264 10.00
P1.08
Deceleration Time 4
P1.15=0: 0.00~600.00 sec
P1.15=1: 0.0~6000.00 sec
R/W 0108H 40265 10.00
*Decimal value is the Modbus address + hexidecimal value; 40001 + 263(0107H) = 40264).
In the GS4 keypad, change the default value of P1.07 from 10 to 9.97. Now read this value
with your PLC to verify your PLC addressing is correct. If your PLC reads back a value of 10,
use the keypad to change P1.06 to 9.96 and P1.08 to 9.98. Then try to read again. Remember,
some controllers use Base 0 and some use Base 1 addressing. So, you may need to offset your
addressing by 1. If you still have issues, please refer to the detailed Modbus information in
Chapter 5.
Once you have verified that your PLC addressing is correct, serial control for the drive is very
simple. Enter the following values to set up PLC Control RS485 for the drive:
Parameter Settings Table
Parameter
MODBUS
Address
Description Setting Value Note
HEX Decimal
P3.00
0300 40769
Remote source of
operation
3: RS-485, Keypad
Stop enabled
This allows the RS-485 commands
to start and stop the drive when
the REMOTE button is pressed
(drive is in REMOTE mode).
P4.00
0400 41025
Remote source of
frequency
1: RS485
Communication
This allows the RS-485 commands
to set the drive speed when the
REMOTE button is pressed (drive
is in REMOTE mode).
Now when the REMOTE button is pressed, the drive will start via serial commands. The drive will
stop by either serial command or by pressing the STOP button on the keypad. (To return to full
keypad control, press the LOCAL button. The drive will Start and Stop with the keypad. Pressing
ENTER when the cursor is beside the “F” on the display, will allow the arrow keys to adjust the
drive output frequency).
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