Chapter 5
–
Communication
RMBA-01 User
’
s manual
5-3
Exception codes
The RMBA-01 supports the Modbus exception codes
shown in
Table 5-2
.
Table 5-2 Exception codes.
Data update
The RMBA-01 module has been designed for time-
optimised, reliable data transfer between the Modbus
network and the drive.
Table 5-3 Function codes.
Data set registers are updated in a cyclic interval.
Updating of parameter registers happens at a slower
interval.
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.
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
registers
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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