Modbus
SECTION 5 Modbus Communications Procedure
5-16
Note: For details on variable writing, refer to Variable Write, Multiple on
page 5-11. For details on AT, refer to the E5CN/E5AN/E5EN/
E5GN Digital Temperature Controllers User's Manual Basic Type
(Cat. No. H156).
(4) 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: 01; related information: 01)
•Address: H’0000 (fixed)
Write data: H’0101 (Run/Stop, Stop command)
(5) Operation Commands and Precautions
● Communications Writing
Set the Communications Writing parameter to “ON” (enabled) or “OFF”
(disabled) with the related information setting.
The setting can be accepted in both setup area 0 and setup area 1. An
operation error will occur, however, if communications writing enable/
disable is set for an event input.
● RUN/STOP
Set control to “run” or “stop” with the related information setting. The
setting can be accepted in both setup area 0 and setup area 1. An
operation error will occur, however, if RUN/STOP is set for an event
input.
● Multi-SP
Set four set points beforehand in the adjustment level so that you can
switch to a desired set point. The setting can be accepted in both setup
area 0 and setup area 1. An operation error will occur in the following
situations.
• When AT is being executed.
• When the Multi-SP Uses parameter is set to OFF.
• When the Multi-SP Uses parameter is set to ON but multi-SP is set for
an event input (Number of Multi-SP Uses > 0).
● AT Execute/Cancel
Set AT (auto-tuning) to “execute” or “cancel” with the related information
setting. This command can be accepted in setup area 0 only. An
“operation error” will be generated in the following instances:
• When the RUN/STOP parameter is set to “stop”
• When the command is executed in “setup area 1”
• When ON/OFF control is being used
01 06 00 00 01 01 49 9A(CRC-16)
01 06 00 00 01 01 49 9A(CRC-16)
Command:
Response:
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