7-19
7-5 Setting the Communications Data
The following description provides information on how to convert the register data (such
as monitor value or parameter set value data) in the communications data block of the
message data (such as DSR and response data).
H Converting the Register Data
• The data in each register is sent as 2-byte data.
• The data in each register is processed under the following rules and sent in hexadecimal.
D The data is converted to a hexadecimal value based on the minimum unit of
setting of each register as 1.
If the frequency reference is 60 Hz and the minimum unit of setting will be 0.01 Hz,
the data will be converted as follows:
60 (Hz)/0.01 (Hz) = 6000 = 1770 Hex
Note 1. The minimum unit of setting of each parameter is indicated whenever the parameter is
explained in this manual and in Section 10 List of Parameters. For registers other than those
of parameters, refer to 7-6 Register Number Allocations in Details.
Note 2. The minimum unit of setting of frequency reference data or frequency monitor data is deter-
mined by n152 (register 0198 Hex: RS-422/485 communications frequency reference/moni-
tor unit selection). The unit of setting of each of the three registers below is determined by the
set value in n152. For the units of setting of these constants, refer to the List of Parameters.
The set value in n152 has nothing to do with frequency data items set as parameter constants
(e.g., frequency references 1 through 16, inching frequency reference, maximum frequency,
minimum output frequency, jump frequency).
S Monitor Items
Register 0023: Frequency reference monitor
Register 0024: Output frequency monitor
S Communications-dedicated Register
Register 0002: Frequency reference
In spite of the set value in n152, however, set the maximum frequency to 3000 when the frequency
reference is executed with a broadcast message. In this case, the Inverter rounds off any value
less than 0.01 Hz.
Note 3. There are parameters that make setting unit changes when the values are increased with the
Digital Operator. The smaller units are, however, used for communications in such cases. For
example, the value in n083 (register 0153 Hex: jump frequency 1) will be set in 0.01-Hz incre-
ments if the frequency is less than 100 Hz and 0.1-Hz increments if the frequency is 100 Hz or
over. The value 0.01 Hz is always 1 Hex for communications.
If the jump frequency is 100.0 Hz, the minimum unit of setting will be 0.01 Hz and the
data will be converted as follows:
100.0 (Hz)/0.01 (Hz) = 10000 = 2710 Hex
Communications Chapter 7
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