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4 Modbus Communications Procedure
E5

C-T Digital Temperature Controllers Programmable Type Communications Manual (H186)
4-4 Deta
iled De
scriptio
n
o
f the Ser
vic
es
4
4-4-2 V
a
riab
le Wr
ite
, Multiple

Response Frame
Response Code
Name Description
Slave address The value from the command frame is entered as-is.
Function code This is the received function code.
When the function ended normally, the function code is left as-is. When
an error occurred, the hexadecimal value of H'80 is added to the function
code to indicate that the response is an error response.
Example: Received function code = H'10
Function code in response frame when an error occurred =
H'90
Write start address This is the received write start address.
Number of elements This is the received number of elements.
CRC-16 This check code is calculated with the data from the slave address to the
end of the data.
For details on the CRC-16 calculation, refer to
CRC-16 Calculation
Example in 4-1-1 Command Frame on page 4-2.
Function code Error code Error name Cause
H
'
90 H
'
02
Variable address
error The write start address is incorrect.
H
'
03
Variable data error • The amount of data does not match the
number of elements.
• The byte count is not 2 times the number
of elements.
• The write data is out of the setting range.
H
'
04
Operation error The Controller cannot write the data in its
present operating status.
The write data contents are not allowed in
the present operation mode.
• The Communications Writing parameter is
set to "OFF" (disabled).
• Attempted to write to a parameter in setup
area 1 from setup area 0.
• Attempted to write to a protect parameter
from other than the protect level.
• AT execution is in progress.
• The Program No. parameter was written
during operation.
H
'
10
--- Normal completion No errors were found.
CRC-16
1 2
2
1
H’ 10
Nu m b er of
Elements
2 b ytes
Sla v e
address
F u nction
code
W rite start address