Omron EJ1 User Manual page 49

Unit Configuration Examples
2-4-1 Connection Precautions
Restrictions on the Number of Units that Can Be Connected
Note
Precautions When Using
an HFU
Note
Precautions when Not
Using an HFU
Note
28
• Unit numbers 0 to 63 can be used for EJ1-HFU and EJ1-TC4/TC2 Units.
• Up to 16 Units, including the HFU, can be connected side by side.
EDU Units are not counted in the number of Units that can be connected.
• One HFU can control up to 16 TC4/TC2 Units.
• The unit numbers of the TC4/TC2 Units can be set to between 0 and 31.
• To connect 16 TC4/TC2 Units, Communications Cables must be used to
distribute Unit positioning because the maximum number of Units that can
be connected horizontally will be exceeded.
• When using Communications Cables to distribute TC4/TC2 Unit position-
ing, connect the cables to port B on the End Units.
• If distributed positioning is used for an EJ1, power must be supplied sepa-
rately to the terminal block on the End Units.
When using distributed positioning, turn ON power to the distributed Units first
or turn ON power to the HFU and distributed Units simultaneously. Even if this
is done, there may still be problems with the startup timing depending on the
EJ1 configuration and power supply capacity. If problems occur at startup,
increase the delay between turning ON the power to the distributed Units and
the HFU.
One HFU can manage up to 16 TC Units (4 channels × 16 Units = 64 channels)
EDU Units are not included in the number of Units that can be managed.
EJ1@-HFU
Up to 16 Units can be connected side by side.
EDU Units are not counted in the number of Units that can be connected.
• Up to 16 TC4/TC2 Units can be connected horizontally to one End Unit. If
End Units are connected with Communications Cables for distributed
position, then up to 64 Basic Units can be connected to one host device.
(1) The host device and End Units are not counted when calculating the limit
of 64 Basic Units.
(2) Set the unit numbers of the Basic Units to between 0 and 63. Be sure not
to set the same number for more than one Basic Unit.
• If distributed positioning is used for an EJ1, power must be supplied sepa-
rately to the terminal block on the End Units.
EJ1@-EDU
EJ1@-TC4
or
EJ1@-TC2
Section 2-4
Turn ON
pin 8 on
SW2.
EJ1@-TC4
EJ1@-EDU
or
EJ1@-TC2