Omron NX-ECC201 User Manual page 23

• Check the user program, data, and parameter settings for proper execution before you use them for
actual operation.
Turning OFF the Power Supply
• Do not disconnect the cable or turn OFF the power supply to the Controller or a Slave Terminal when
downloading data or the user program from Sysmac Studio.
• Always turn OFF the external power supply to the Units before attempting any of the following.
Mounting or removing an NX Unit, Communications Coupler Unit, or CPU Unit
Assembling Units
Setting DIP switches or rotary switches
Connecting or wiring cables
Attaching or removing terminal blocks or connectors
Units that supply power continue to supply power to the Units for up to several seconds after the
power supply is turned OFF. The PWR indicator remains lit as long as power is supplied. Confirm that
the PWR indicator is not lit before you perform any of the above.
Operation
• Confirm that the controlled system will not be adversely affected before you perform any of the fol-
lowing operations.
Changing the operating mode of the CPU Unit (including changing the setting of the Operating
Mode at Startup)
Changing the user program or settings
Changing set values or present values
Forced refreshing
• Always sufficiently check the safety at the connected devices before you change the settings of an
EtherCAT slave or Special Unit.
General Communications
• Do not exceed the ranges that are given in the specifications for the communications distance and
number of connected Units.
EtherCAT Communications
• Make sure that the communications distance, number of nodes connected, and method of connec-
tion for EtherCAT are within specifications.
Do not connect EtherCAT Coupler Units to EtherNet/IP, a standard in-house LAN, or other networks.
An overload may cause the network to fail or malfunction.
• Malfunctions or unexpected operation may occur for some combinations of EtherCAT revisions of the
master and slaves. If you disable the revision check in the network settings, check the slave revision
settings in the master and the actual slave revisions, and then make sure that functionality is compat-
ible in the manuals or other references. You can check the slave versions in the settings from the
Sysmac Studio and you can check the actual slave revisions from the Sysmac Studio or on slave
nameplates.
• After you transfer the user program, the CPU Unit is restarted and communications with the Ether-
CAT slaves are cut off. During that period, the slave outputs behave according to the slave settings.
The time that communications are cut off depends on the EtherCAT network configuration.
Before you transfer the user program, confirm that the system will not be adversely affected.
• EtherCAT communications are not always established immediately after the power supply is turned
ON. Use the system-defined variables in the user program to confirm that communications are estab-
lished before attempting control operations.
NX-series EtherCAT Coupler Unit User's Manual (W519)
Precautions for Safe Use
21