E5CNH E5AN-H E5EN-H Digital Controllers User's Manual - OMRON

Wiring Terminals Section 2-2
Communications RS-485
38
When communications are to be used with the E53-CN@03N2 for the
E5CN-H, or E53-EN03 for the E5AN/EN-H, connect communications
cable across terminals 11 and 12 or 21 and 22.
11
12
E53-CN@03N2 (for E5CN-H)
Specify both ends of the transmission path including the host computer as
end nodes (that is, connect terminators to both ends).
The minimum terminal resistance is 54 Ω.
Communications Unit Connection Diagram
E5CN-H
E5AN/EN-H
− +
FG
A < B: [1] Mark
A > B: [0] Space
B(+)
A(−)
RS-485
Host computer
RS-485 Shield
Host computer
RS-485
−
+
FG
A < B: [1] Mark
A > B: [0] Space
11
12
13
21
22
B(+)
A(−)
Do not use.
B(+)
RS-485
E53-EN03 (for E5AN/EN-H)
The RS-485 connection can be either one-to-one or one-to-N. A maximum
of 32 Units (including the host computer) can be connected in oneto-N
systems. The maximum total cable length is 500 m. Use AWG24
(cross-sectional area: 0.205 mm2 ) to AWG14 (cross-sectional area:
2.081 mm2 ) shielded twisted-pair cable.
A(−)
E5CN-H (No. 1) E5CN-H (No. 31)
RS-485
RS-485
No. Abbreviation No. Abbreviation
12 A (−)
12 A (−)
11 B (+)
11 B (+)
Shield
Terminator (120 Ω, 1/2 W)
E5AN/EN-H (No. 1)
E5AN/EN-H (No. 31)
RS-485 RS-485
No. Abbreviation
No. Abbreviation
22 A (−)
22 A (−)
21 B (+)
21 B (+)
12 A (−)
12 A (−)
11 B (+)
11 B (+)
Terminator (120 Ω, 1/2 W)
Cross-sectional area of
conductor
AWG24: 0.205 mm 2
AWG14: 2.081 mm 2