Instruction Manual
3-5
- IV Series User’s Manual (Field Network) -
Cyclic communication setting method
PLC settings
You can set the following settings for the PLC:
(1)
Set the connection to be used for the cyclic communication.
(2)
Set the device to be used for the cyclic communication.
For details of the setting, refer to the instruction manual of each PLC.
If you are using the Keyence KV series, (1) and (2) can be set automatically simply by making a selection
in KV STUDIO.
Establishing the connection
In the cyclic communication, one device opens a logical communication circuit called a “connection” for the
other device; and data communication will become possible if the open is successful.
The device that will open a connection is referred to as the “scanner”, and the device whose connection
will be opened is referred to as the “adapter”.
(IV series is an adapter device)
In the EtherNet/IP communication, a connection must be opened from the scanner when the cyclic
communication is started.
The communication is started in the following procedure:
(1) The scanner requests a connection open request to the adapter.
(2) Compatibility will be checked on the adapter side.
(3) A connection will open if no error is encountered in the compatibility check.
(1) Connection open request
(3) Connection open
(2) Compatibility check
Scanner Adapter device
A compatibility check is used to check whether the device set by the scanner and the IV series are in
match with one another, in order to prevent the scanner from communicating with a wrong device when
it communicates with the IV series.
Communication settings for the cyclic communication, such as the communication cycle (RPI) and the
data size, will be congured on the scanner side.
In a network with many connected devices (including the EtherNet/IP devices), a network delay and/
or packet loss may occur when there is a heavy load on the network. Conduct a thorough verication
before the operation.
3
Cyclic communication