Rockwell Automation 2711P Creating Modbus Applications - Manual (Page 60)

Publication 2711P-UM002B-EN-P - March 2007
60 Troubleshooting
Bad address in block [x to y] on
device ’’ Fatal
addresses
failing in this
block This error is reported when the driver attempts
to read a location in a PLC that does not exist.
For example, in a PLC that only has holding
registers 40001 to 41400, requesting address
41405 would generate this error. Once this error
is generated, the driver will not request the
specified block of data from the PLC again. Any
other addresses being requested that are in the
same block will also be invalid. Modify the client application to request
addresses within the range of the device.
Bad received length [x to y] on
’’ Fatal
addresses
failing in this
block The driver attempted to read a block of memory
in the PLC. The PLC responded with no error, but
did not provide the driver with the requested
block size of data. Ensure that the range of memory exists for the
PLC.
Error Error Type Possible Cause Solution