Chapter 6 – Communication
NMBA-01 Installation and Start-up Guide
6-3
Exception Codes
The NMBA-01 supports the Modbus exception codes shown in
Table 6-2.
Table 6-2 Exception Codes.
Data Update
The NMBA-01 module has been designed for time-optimised, reliable
data transfer between the Modbus network and the drive.
Table 6-3 Function Codes.
Data set registers are updated in a fast cyclic interval. Updating of
parameter registers happens in a slower interval. In case of a single
parameter register read or write request, the parameter value is
updated directly from the drive’s internal memory. In case of a multiple
parameter register read or write request, the parameter values are
updated from the internal memory of the NMBA-01.
Code
Name
Reason
01
ILLEGAL FUNCTION
Unsupported Command.
02
ILLEGAL DATA
ADDRESS
Address does not exist or is read/write
protected.
03
ILLEGAL DATA VALUE
Value is outside min-max limits.
Parameter is read-only.
04
SLAVE DEVICE
FAILURE
Reading a multiple parameter register,
which includes one or more read protected
parameters.
06
SLAVE DEVICE BUSY
DDCS channel timeout.
Code
Name
Meaning
03
Read Holding Registers
Reads the binary contents of holding
registers (4X references) in the slave.
06
Preset Single Register
Presets a value into a single holding register
(4X reference). When broadcast, the
function presets the same register reference
in all attached slaves.
16
(10 Hex)
Preset Multiple Regs
Presets values into a sequence of holding
registers (4X references). When broadcast,
the function presets the same register
references in all attached slaves.
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