Transitions Of Communications States - Omron FH series User Manual

Transitions of Communications States

The state transition model for communications control of the EtherCAT Slave Terminals is controlled by the
EtherCAT master.
The following figure shows the communications state transitions from when the power supply is turned ON.
Power supply ON
Init
Pre-Operational
Operational
The table below shows whether or not data objects can be sent and received in each communication state.
Status
Init
Pre-Operational
Safe-Operational
Operational
Vision System FH/FZ5 Series User's Manual
for Communications Settings (Z342)
Safe-Operational
SDO
Sending Receiving
communi
PDOs PDOs
cations
Not possi- Not possi- Not possi-
ble ble. ble.
Not possi- Not possi-
Possible.
ble. ble.
Not possi-
Possible. Possible.
ble.
Possible. Possible. Possible.
Communications are being initialized. Communications are
not possible.
Only SDO communications (message communications) are
possible in this state.
This state is entered after initialization is completed. It is
used to initialize network settings.
In this state, both SDO communications (message commu-
nications) and sending PDOs are possible.
Information, such as status, is sent from the Slave Terminal.
This is the normal state for communications.
PDO communications are used to control the I/O data.
EtherCAT Connections (FH-1000 series/FH-3000 series only)
Description
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