Omron NX-ECC201 User Manual

8 EtherCAT Communications
8 - 4
NX-series EtherCAT Coupler Unit User’s Manual (W519)
8-3 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.
Status
SDO com-
munica-
tions
Sending
PDOs
Receiving
PDOs
Description
Init Not possi-
ble.
Not possi-
ble.
Not possible. Communications are being initialized. Communi-
cations are not possible.
Pre-Operational Possible. Not possi-
ble.
Not possible. Only SDO communications (message communi-
cations) are possible in this state.
This state is entered after initialization is com-
pleted. It is used to initialize network settings.
Safe-Operational Possible. Possible. Not possible. In this state, both SDO communications (mes-
sage communications) and sending PDOs are
possible.
Information, such as status, is sent from the
Slave Terminal.
Operational Possible. Possible. Possible. This is the normal state for communications.
PDO communications are used to control the I/O
data.
Init
Pre-Operational
Safe-Operational
Operational
Power supply ON

Omron NX-ECC201 Specifications

General

Brand	Omron
Model	NX-ECC201
Category	Controller
Language	English