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Sect
ion 3
Dev
ic
e
Net
Co
m
m
u
n
ic
at
io
n Se
tt
ings
E3X-DRT21-S
User’s Manual
Section 3
Overview of DeviceNet Communication Type
●
Explicit Message Communications
Any parameters of the connected sensors can be read or written by issuing commands of
Explicit messages to the Communication Unit (E3X-DRT21-S).
Type
Communication Data
Condition
Sends an Explicit Read
command
Reads any parameters such as the ON/
OFF output data, the detection level, and
threshold values
Not allowed when connected
with the Mobile Console.
Sends an Explicit Write
command
Writes (sets) any parameters such as
threshold values
Sends an Explicit Operation
Instruction command
Various operations such as teaching
Unit
No.
1
Unit
No.
2
Unit
No.
13
DeviceNet Unit
CPU Unit
PLC
Ladder Program
e.g. CMND command
●
Explicit Message Communications
DeviceNet
Sensor Head
Amplifier Unit
Communication Unit
DeviceNet
Communication Type
E3X-DRT21-S