C.9 Communication ErrorsErrors that may occur when accessing drive parameters using the BACnet objects are shown in Table C.12.Table C.12 MEMOBUS to BACnet Error ConversionError Code Description03d BN_ERR_DEVICE_IS_BUSYWriting to a parameter was attempted while the drive was saving parameters to non-volatile memory.27d BN_ERR_READ_ACCESS_DENIEDInvalid parameter register number used when reading.37d BN_ERR_VALUE_OUT_OF_RANGEValue written to the parameter is out of the valid range.40dBN_ERR_WRITE_ACCESS_DENIEDAn invalid parameter register number was used when writing.Writing to a parameter was attempted while the drive was in a mode that disables writing (i.e., writing while the drive wasAuto-Tuning).Writing to a parameter was attempted while the DC Bus had an Undervoltage (Uv) faultC.9 Communication ErrorsYASKAWA ELECTRIC TOEP C710616 45F YASKAWA AC Drive – Z1000 User Manual 359C BACnetCommunications