Rockwell Automation 900 Temperature Controller Communications Functions - Series B - Manual (Page 75)

Publication 900-UM004D-EN-E - July 2010
Modbus Communications Procedure 4-17
Error Occurred
Example Command and Response
The following example shows the command/response for a Stop command.
(In this case, the slave address is H’01.)
Stop command (command code: H’01; related information: 01)
· Address: H’0000 (fixed)
Write data: H’0101 (Run/Stop, Stop command)
Figure 4.17
Table 4.14
Function
code Error code Name Description
H’86 H’02 Variable address
error • The write variable address is
incorrect.
• The variable area number (2-byte
data) is wrong, or the address is
not 0000 or FFFF.
H’03 Variable data
error The write data is incorrect.
• The write data is out of the
setting range.
• Command code or related
information is incorrect
H’04 Operation error The Controller cannot write the data
in its present operating status.
• The Communications Writing
parameter is set to “OFF”
(disabled). The command is
received regardless of the
Communications Writing
parameter setting (ON/OFF).
• Writing was attempted from
setup area 0 to setup area 1.
• Writing was attempted to a
protected parameter from
outside the protect level.
• AT execution was in progress.
• Processing could not be
performed. For details, refer
to Operation Commands and
Precautions on page 4-18
01 06 00 00 01 01 49 9A(CRC-16)
01 06 00 00 01 01 49 9A(CRC-16)
Command:
Response: