Omron E3X-CIF11, Руководство по эксплуатации

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Appendix C
DeviceNet Connection Settings
DeviceNet supports different protocols for remote I/O communications between master and slave devices.
Connections are used to manage those protocols. The connections can be set from the DeviceNet Configura-
tor. The DeviceNet remote I/O communications protocol supports four types of connection: Poll, bit-strobe,
COS (change of state), and cyclic. The features of these connections are listed in the following table. The Com-
munication Unit supports all of these.
Note To use COS and cyclic connections with the Communication Unit, the DeviceNet master must also sup-
port them. Confirm that the master supports COS and cyclic connections before using them. OMRON
masters, such as the CS1W-DRM21 and CJ1W-DRM21, support COS and cyclic connections.
Setting Connections without Using Configurator
The connections used for all the IN data of the Fiber Amplifier Sensor Communication Unit are as follows:
• Data of 8 bytes or less: Bit-Strobe
• Data of more than 8 bytes: Poll
Connection Contents
Poll Used for basic I/O.
Bit-Strobe Used for input of 8 bytes or less. Sends broadcasting requests
from master and receives input from slaves. Poll and Bit-Strobe connec-
tions cannot be used at the
same time.
COS
(Change of state) This connection can be used to send data to the master from the
Fiber Amplifier Sensor Communication Unit only when the data
changes. Transmission timing is determined by a heartbeat timer.
Data can be sent only when required, thereby reducing the com-
munications load on the network. COS and Cyclic connections
cannot be used at the same
time.
Cyclic Communications timing is determined by regular cycles (heartbeat
timer). The Communication Unit will send data at a regular cycle.