#Modbus poll read error code#
If a request is submitted with a starting register address of 96 and a quantity of registers of 5, then this request will fail with Exception Code 0x02 “Illegal Data Address” since it attempts to operate on registers 96, 97, 98, 99 and 100, and there is no register with address 100.Ī value contained in the query data field is not an allowable value for the server (or slave). If a request is submitted with a starting register address of 96 and a quantity of registers of 4, then this request will successfully operate (address-wise at least) on registers 96, 97, 98, 99. For a controller with 100 registers, the PDU addresses the first register as 0, and the last one as 99. More specifically, the combination of reference number and transfer length is The data address received in the query is not anĪllowable address for the server. It could also indicate that the server (or slave) is in the wrong state to process a request of this type, for example because it is not configured and is being asked to return register values. This may be because the function code is only applicable to newer devices, and was not implemented in the unit selected. The function code received in the query is not an allowable action for the server (or slave). Modbus exceptions are errors returned from the slave device.
Print ( "Modbus write success" ) else : print ( "Write failed error: = ", WriteResult ) _ = input ( "Press ENTER to quit:" ) WriteMultipleRegisters ( 1, 0, 5 ) _ = input ( "Wait for write Press ENTER:" ) if Win1. # Use the function > to create a data window This function do not create a window in Modbus Poll SRegisters ( 4, 10000 ) # Write the registers. SRegisters ( 1, 10 ) # Modbus address but an index to the array SRegisters ( 0, 1 ) # Note that parameter 1 is not a GetRxCount )) # Prepare the internal array in Modbus Poll with data to write ReadResult ) print ( "Tx count = % d, Rx count = % d" % ( Win1. SRegisters ( 0 )) else : print ( "Read failed error: = ", Win1. Rows ( 0 ) # Resize the window to fit to the grid
ReadHoldingRegisters ( 1, 0, 10, 1000 ) # Show the Modbus window Dispatch ( "Mbpoll.Document" ) # Read 10 holding registers from slave ID 1, address 0 (40001) every 1000ms exit () #Create a Modbus display window called Win1 OpenConnection if result != 0 : print ( "Connection failed. ConnectTimeout = 500 # Wait 500ms until give upĪpp. DelayBetweenPolls = 20 # Ensure minimum 20 ms gap until next requestĪpp. ResponseTimeout = 1000 # Wait 1000ms until give upĪpp. Import sys import time import win32com.client as win32 App = win32. GetName ( 1 )) _ = input ( "Press ENTER to quit:" ) SetName ( 92, "DOUBLE_LE_BS" ) # Refresh SetFormat ( 92, DOUBLE_LE_BS ) # Set all Names to used format EnableRefresh = False # Set all different formats ReadHoldingRegisters ( 1, 0, 100, 1000 ) # Show the Modbus window
Dispatch ( "Mbpoll.Document" ) # Read 100 holding registers from slave ID 1, address 0 (40001) every 1000ms OpenConnection #Create a Modbus display window called Win1
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