Omron E3X-DRT21 Operation Manual page 24

Overview of DeviceNet Communications Model
Communications mode
Remote I/O communications
one-word mode
Remote I/O communications,
two-word mode
Remote I/O communications
two-word mode with incident
light level monitoring
Explicit Message
Communications
Words
One word in Sent to the master:
IN Area
ON/OFF output signals for up to 13 Sensors.
Two words in Sent to the master:
IN Area
ON/OFF output signals for up to 16 Sensors.
Number of Sensors able to communicate.
Number of Sensors connected.
Two words in Sent to the master:
IN Area plus
ON/OFF output signals for up to 16 Sensors.
words for
Number of Sensors able to communicate.
number of
Number of Sensors that are connected.
Sensors con-
nected
Incident light levels of up to 16 Sensors.
Sending explicit messages to the E3X-DRT21 Communication Unit enables
reading and writing Sensor parameters.
DeviceNet Unit
E3X-DRT21 Fiber
Amplifier Sensor
Communication
Unit for DeviceNet
E3X-DA-N Digital Fiber Amplifier Unit
(Uses Cordless Slave Connector.)
Message
Sends EXPLICIT READ
command
Sends EXPLICIT WRITE
command
Sends EXPLICIT OPERA-
TION command
Communications data
CPU Unit
Ladder program
CMND(490), etc.
Explicit message
DeviceNet
Fiber Sensors
Unit Unit Unit
1 2 13
Communication data
Reads parameters, including ON/
OFF data, incident light levels, and
thresholds.
Writes parameters, including maxi-
mum sensitivity, and thresholds.
Performs various operations includ-
ing teaching and fine tuning.
Section 2-1
Number of Conditions
Sensors
13 max. ---
16 max.
16 max. Incident light
levels cannot
be monitored if
Mobile Con-
sole is con-
nected.
PLC
Conditions
Cannot be used
when a Mobile
Console is con-
nected.
13