Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 496

E5 @ K Digital Controller Read Protocol
RS-485 Connection
Serial Communications Board
(CS Series only)
Serial Communications Unit
(CS/CJ Series)
RS-485 port
Note 1. The communications configuration is a one-to-one configuration or a one-to-N configuration. In the
one-to-N configuration, up to 32 units including the Serial Communications Unit/Board can be con-
nected.
2. The maximum cable length is 500 m. Use a shielded twisted-pair cable for the cable (AWG28i or
greater).
3. Connect a terminator only at both ends of the transmission path. For instance, in the example shown
below, connect a terminator to the Serial Communications Unit/Board and unit No. 30 and do not con-
nect any terminator to units No. 0 to No. 29. Use a resistance of 120 Ω (1/2 W) for the terminators
(the total resistance of both ends must be 54 Ω or more).
Serial Communications Board/Unit
RS-485: D-sub
9 pin female
Pin No.
1
2
A<B:
A>B:
PLC PS
Shielded cable
FG
[1] Mark
[0] Space
RS-485
Up to 31 units can be connected.
RS-485
E5CK (No. 0)
RS-485: Terminal block
Terminal No.
A
13
14
B
Terminator (120 Ω, 1/2 W)
Appendix F
E5#K
→
RS-485
E5#K
→
E5#K
→
E5CK (No. 30)
RS-485: Terminal block
Terminal No.
A
13
14
B
467