Installation; Connecting Terminal Units Together - Omron E5ZN-DRT Operation Manual

Installation

3-2

Installation

3-2-1

Connecting Terminal Units Together

26
Note 1. Always turn OFF the DeviceNet communications power supply and Termi-
nal Unit power supply before setting the switches.
2. When using simple I/O allocation, a Temperature Controller with a unit
number higher than that set with the rear panel rotary switch cannot be
used.
3. The data allocated in the IN and OUT Areas is automatically set according
to this setting.
4. The factory setting of the rear panel rotary switch is 1.
Connect the DeviceNet Communications Unit to an E5ZN-SCT24S Basic Ter-
minal Unit and connect the Temperature Controllers to an E5ZN-SCT18S
Expansion Terminal Unit.
When using RS-485 communications, however, connect a E5ZN-SCT24S
Basic Terminal Unit to the leftmost Temperature Controller.
Up to 16 Temperature Controllers can be connected to a single DeviceNet
Communications Unit.
DeviceNet
Communications Unit E5ZN Temperature Controllers
+
24
VDC
UNIT UNIT
BPS BPS
POWER POWER
ERROR
ERROR
SD/RD SD/RD
OUT1 OUT1
OUT2 OUT2
SUB1 SUB1
SUB2 SUB2
E5ZN E5ZN
RS-485 communications cable
(total cable length: 500 m max.)
(A single-block configuration without RS-485
communications cables can also be used.)
Note Do not connect DeviceNet Communications Units to communications cables
or disconnect them from the cables while the DeviceNet Network is operating.
Abnormal communications may result from short-circuited DeviceNet cables,
loose contacts, or from changing the location of terminating resistance
(DeviceNet) due to changes in the node configuration.
Terminal Units can be joined together by connecting the side connector on
each Terminal Unit. Connect the required number of Terminal Units together.
(16 Controllers max.)
+ +
24 24
VDC VDC
UNIT UNIT UNIT UNIT
BPS BPS BPS BPS
POWER POWER POWER
POWER
ERROR ERROR ERROR ERROR
SD/RD SD/RD SD/RD SD/RD
OUT1 OUT1 OUT1 OUT1
OUT2 OUT2 OUT2 OUT2
SUB1 SUB1 SUB1 SUB1
SUB2 SUB2 SUB2 SUB2
E5ZN E5ZN E5ZN E5ZN E5ZN
Side
connectors
E5ZN-SCT24S Terminal Unit
on left end of each block
UNIT
BPS
POWER
ERROR
E5ZN-SCT18S Terminal Units
SD/RD
OUT1
OUT2
SUB1
on locations other than left
SUB2
E5ZN
end of each block
Section 3-2