Omron NX Series Hardware User Manual page 30

Precautions for Safe Use
• You cannot use standard Ethernet hubs or repeater hubs with EtherCAT communications. If you use
one of these, a major fault level error or other error may occur.
• If the actual configuration changes, for example, when actual configuration does not contain a disa-
ble slave and subsequently you include it in the actual configuration, set the total cable length for the
case of the worst scenario.
• Confirm that all of the slaves are connected before you set the transmission delay time by the actual
measurement. If the transmission delay time is exceeded from the set values due to the changes of
the unit configuration, such as when the disabled salve is connected to the actual configuration after
the setting, it may cause illegal communications with slaves.
• When the communications cable that is connected to the slave from other manufacturers on the ring
topology is broken or the power supply to the slave from other manufacturers is interrupted, any cur-
rent communications frames may be lost.
If frames are lost, slave I/O data is not communicated, and unintended operation may occur.
When slaves from other manufacturers are connected on the ring topology, check the followings in
advance.
a) Disconnect and connect communications cables that are connected to the output ports of slaves
from other manufacturers several times, and there is no error except for a Ring Disconnection
Detected.
b) Disconnect and connect communications cables that are connected to the input ports of slaves
from other manufacturers several times, and there is no error except for a Ring Disconnection
Detected.
c) Turn OFF and ON the power supply to the slaves from other manufacturers, and there is no er-
ror except for a Illegal Slave Disconnection Detected.
• If you use the cable redundancy function, confirm that the task execution time is within the task peri-
od while the cable for the end port of the ring is disconnected. When a disconnection occurred on
the ring topology, the transmission delay time is increased and the task execution time may be lon-
ger.
Version Information
The cable redundancy function can be used with project unit version 1.40 or later.
Motion control
• Confirm the axis number carefully before you perform an MC Test Run.
• The motor is stopped if communications are interrupted between the Sysmac Studio and the CPU
Unit during an MC Test Run. Connect the communications cable between the computer and CPU
Unit securely and confirm that the system will not be adversely affected before you perform an MC
Test Run.
• Always execute the Save Cam Table instruction if you change any of the cam data from the user
program in the CPU Unit or from the Sysmac Studio. If the cam data is not saved, the previous con-
dition will be restored when the power is turned ON again, possibly causing unexpected machine
operation.
• The positive drive prohibit input (POT), negative drive prohibit input (NOT), and home proximity in-
put (DEC) of the Servo Drive are used by the MC Function Module as the positive limit input, nega-
tive limit input, and home proximity input. Make sure that the signal widths for all of these input sig-
nals are longer than the control period of the MC Function Module. If the input signal widths are
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NX-series NX102 CPU Unit Hardware User's Manual (W593)