10
ENGLISH
Commissioning
In some instances, multiple words can be read for a single register. When this is done for
the registers below, the response from the drive will be for the number of words, rather
than the number of registers, requested:
• Register #500 (Fault History) can be read as 1 word (returning the two most recent
faults) or as 4 words (returning the entire fault history).
• Register #511 (Total kWh) can be read as 1 word (returning only the low word of the
32-bit register value) or as 2 words (returning the complete 32-bit register value).
• Register #540 (Total Runtime Hours) can be read as 1 word (returning only the low
word of the 32-bit register value) or as 2 words (returning the complete 32-bit register
value).
• Register #541 (Total Power On Hours) can be read as 1 word (returning only the low
word of the 32-bit register value) or as 2 words (returning the complete 32-bit register
value).
06 - Preset Single Register (4X references)
Write a single register.
16 - Preset Multiple Registers (4X references)
While code 16 is supported it’s implementation is limited to addressing only one register
per write.
6
Modbus Message Details
The following abbreviations will be used throughout this section when illustrating the
message structure:
R
Read
W
Write
RS
Response
SA
Slave Address (01 ... F7 hex)
EC
Exception Code
RH
Register Address (high byte)
RL
Register Address (low byte)
DxH
Data (high byte)
DxL
Data (low byte)
CRCH
CRC (high byte)
CRCL
CRC (low byte)
