Registering The Number Of Connected Sensors; Sensor Reset Switch - Omron E3X-DRT21-S User Manual

Section 2
Connecting Sensors

Registering the Number of Connected Sensors

To detect whether communications between communication units and Sensors are
normal, the number of connected Sensors must be registered.
By registering the number of Sensors connected, when there is no response on the optical
communications of Sensors due to damage to the Sensors and so on, errors can be
detected from the difference between the number of Sensors that can be communicated
with and the number of Sensors registered.
When there is a difference between the number of Sensors connected and the number of
Sensors registered, it is indicated as follows:
• The SS LED lights red.
• [Sensor Communication Error] Flag turns ON.
Setting the Number of Connected Sensors
E3X-DRT21-S (DeviceNet communications type)
The Sensors that are allocated two unit numbers must be counted as two units when counting the
number of sensors.

Sensor Reset Switch

Using the sensor reset switch allows you to replace and add Sensors without turning OFF
the power for the communication unit.
After replacing the Sensors and so on, press the reset switch to reset all the Amplifier
Units and restart normally the communications between the communications unit and
Sensors.
E3X-DRT21-S
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User's Manual
Type Setting method
Registering using rotary switch.