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31
Wiring the Terminal Unit
Section 3-3
3-3-3
RS-485 Communications Wiring
RS-485 communications can be used to connect Temperature Controllers in
remote locations to the DeviceNet Communications Unit.
RS-485 communications cables can be extended up to 500 m.
Connect terminating resistance of 100 to 125
Ω
(1/2W) between terminals 23
and 24 of the devices connected to each end of the RS-485 communications
line.
Connect the RS-485 communications cables to terminals 23 and 24, as
shown in the following diagram.
RS-485 Communications
Cables
Use shielded twisted-pair cable (AWG 28 or larger) for the RS-485 communi-
cations cables, as shown in the following diagram.
(B)
(A)
(B)
(A)
24
23
24
23
(B)
(A)
24
23
RS-485
DeviceNet
Master
(PLC)
Terminating resistance
100 to 125
Ω
(1/2W)
Terminating
resistance
100 to 125
Ω
(1/2W)
DeviceNet Communications
Unit
Temperature
Controller
Temperature
Controller
Temperature
Controller
7
8
9
1
2
3
19
20
21
13
14
15
22
23
24
16
17
18
10
11
12
4
5
6
E5ZN-SCT24S
B(+)
A(
−
)
RS-485
24
23
AWG28 or larger; 0.81 mm
2
or
larger conductor cross-section
Cable Reference Diagram
Содержание E5ZN-DRT
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Страница 15: ...xvi EC Directives 6 ...
Страница 83: ...68 Ladder Programming Examples Section 4 5 ...
Страница 123: ...108 Sending Explicit Messages Section 6 5 ...
Страница 135: ...120 Message Communications Characteristics Section 7 2 ...
Страница 157: ...142 Index Unit status 57 85 user set allocations 43 61 V variable types C0 51 C1 51 C3 52 ...
Страница 159: ...144 Revision History ...
Страница 161: ...E5ZN DeviceNet Communications Unit Cat No H119 E1 01 OPERATION MANUAL ...
Страница 162: ...Authorized Distributor Cat No H119 E1 01 Note Specifications subject to change without notice Printed in Japan ...