MODBUS Communication
5
TI 12A01F01-62EN
1.5 MODBUS password
Entering password on “MODBUS password” protects parameter setting and prohibits data input
except for “cancel MODBUS password” and “gain access authority.”
To be allowed to input data, go to password setting mode. Enter the password you created for
“cancel MODBUS password” then you are allowed to input.
1.6 How to change SENCOM SA address
SENCOM SA*sensor address are all 1 at the time of purchase. If you try to connect multiple
SENCOM SA before you change the address, the communication fails. When you change
SENCOM SA sensor, you have to connect the SENCOM SA one by one and change the
address.
*: SENCOM SA refers to SA11, some sensors connected to SA11.
SA11 is used when -S5 (SENCOM SA) is specied for FLXA402 1st/2nd input.
1.7 Connection
l Ethernet
On the FLXA402 network, Ethernet MODBUS allows 2 sessions.
First session provides communication to Read process value periodically by connecting
constantly.
Second session is for maintenance only when maintenance is required. FieldMate is
recommended for 2nd session.
FLXA402 4-Wire Converter
FieldMate
Maintenance
Data recording
GX
Ethernet
HUB
l RS485
FLXA402 communicates with one MODBUS master via RS485 MODBUS. RS485 is connected
constantly and provides communication for reading process value.
FLXA402 4-Wire Converter
FieldMate
Maintenance
Data recording
GX
RS485
Bluetooth
NOTE
Although connections other than these mentioned above are available, they might disable
obtaining process value, if Read and setting change are implemented in a single session/
communication.
Apr. 19, 2019-00
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