Omron E3X-DRT21 Operation Manual page 30

DeviceNet Communication Unit Part Names and Functions
Sensor Reset Switch
Note Fiber Amplifier Units (E3X-DA6TW and E3X-DA8TW) that are allocated two
unit numbers must be counted as two Units when counting the number of con-
nected Sensors.
Pin 3: Controlling the Setting of the Number of Connected Sensors
The number of Sensors connected is registered by using either a rotary switch
or the Configurator.
When pin 3 is ON, registering the number of Sensors is enabled from Config-
urator or by using explicit messages enabled, and the value for the number of
Sensors enabled for communications that is stored in the internal memory of
the Fiber Amplifier Sensor Communication Unit is used. The default value in
the internal memory is 16. This value can be changed from the DeviceNet
Configurator. The setting methods are shown in the following table.
Pin 3
OFF Use rotary switch to register number of Sensors.
ON Use Configurator or explicit messages to register number of Sensors.
Note When DIP switch pin 3 is ON (registering from Configurator or using explicit
messages), pin 1 is OFF, and pin 2 is ON (remote I/O communications two-
word mode with incident light level monitoring), the value in the internal mem-
ory of the Fiber Amplifier Sensor Communication Unit for the number of Units
being monitored for incident light levels is used. The default value in the inter-
nal memory is 16. This value can be set to a different value from the number
of Sensors connected. When pin 3 is OFF (registering from rotary switch), pin
1 is OFF, and pin 2 is ON, the rotary switch setting applies to both the number
of Sensors connected and the number of Units monitoring incident light level.
Pin 4: Reserved for System Use
This pin must always be OFF.
Press this switch to reset the connected Sensors by executing power interrup-
tion processing. This switch is used in the following case.
If the number of Sensors with communications enabled does not match the
number of Sensors connected, one or more Sensors may have become dis-
connected. The power reset switch is required to enable the Sensors to be
reconnected properly and for communications to be reestablished between
Sensors. Turning OFF the power supply would disconnect the Fiber Amplifier
Sensor Communication Unit from DeviceNet, which may effect the entire sys-
tem. The Sensor reset switch is thus used to reestablish communications with
the Sensors.
Note The E3X-DRT21 automatically uses the DeviceNet baud rate of the master.
Therefore, the DIP switch is not required to set the baud rate.
Method for setting the number of Sensors
Section 2-2
19