ABB ACQ810 - Page 41

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Quickstart Guide
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ABB PLC and drives integration using Modbus RTU
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ModbusRTU‐41‐ PLCanddrivesintegration
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ExampleWr
itedrivedatawith“ACS_MOD_WRITE_N_PRM”
ValuesarewrittentoModbusregisteraddressesaccordingtouserchoice.Noadditionalparametersettingsinthe
drivearenecessary.
Createanewnetworkinthesameprogram(POU)andaddtheblock“ACS_MOD_WRITE_N_PRM”(1).
Setfunctionblockinputsaccordingto:
 ENisconnectedtoan“execute”variableoftyp
e“BOOL”(1).Atrisingedgethevariableiswrittenonce.
 PRIO=Leftunconnected.
 NVAR=Numberofparameterstowrite(3)→2parameterswillbewritteninthisexample.
 PRM_NUM=Startaddress ofparameterstobewritten(4)→parameters12.02and12.03willbewritte
n
inthisexample.
 DATA is connected via an “ADR” block to a new variable (5) of type “ARRAY [1..X] OF INT” according to
instructionsforthe“ACS_MOD_READ_N_PRM”block.
 DRIVE_DATA=Thesamevariablethatis connectedto“ACS_COM_MOD_RTU”→“DRIVE_DATA”(6).
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