HRX-OM-Y120
Chapter 5 Ethernet Modbus / TCP communication
5.6
Precautions for communication
HRL Series
5-4
5.6 Precautions for communication
5.6.1 Precautions after wiring and before communication
○
Check or set each communication setting using the touch panel.
1.
The communication parameter setting should be correct.
2.
The operation mode should be set to the Ethernet mode.
(When the mode request flag is enabled, the mode will be switched
to Ethernet mode. Refer to chapter 3.13.9.
Reading is available with other modes, but writing is only available
with Ethernet mode.
○
Check or set the communication parameters using the touch panel.
5.6.2 Precautions for communicating
○
Allow a suitable interval between requests.
To send request messages in series, wait for a certain time after
receiving a response message from the product before sending the
next message.
○
Retry (resend request message).
The response may not be returned due to noise. If no message is
returned after sending a request message, resend the request
message,
If necessary, send a read request message to check if it was written
correctly.
When handling of the written request message is complete, a positive
message is returned.
Send a read request message to confirm if the settings are written as
required.
〇
Setting the circulating fluid set temperature
When the circulating fluid set temperature is written by communication,
the data is stored in FRAM. When the product restarts, it is with the
value which was set before the restart. The number of times it is
possible to overwrite FRAM is limited. Data is only stored in FRAM
when it receives a circulating fluid set temperature which is different
from the previous temperatures. Please check how many times it is
possible to overwrite FRAM, and avoid unnecessary changes of the
circulating fluid set temperature during communication.
