Omron SYSMAC CS1W-SCB41-V1 Operation Manual page 47

System Configurations
PLC: Connection configuration
Com-
puter
Host
Connection to Serial Communications Board or Serial
Communications Unit
computer
to
Network
PLCs, 1:N
Communications can be sent across three different networks (counting the local network, but not including a
Host Link connection). Routing tables must be set in the PLCs.
Note
18
Controller Link or
Ethernet network
Host Link
Network 1
1. The maximum cable length for RS-232C is 15 m. The RS-232C standard,
however, does not cover baud rates above 19.2 Kbps. Refer to the manual
for the device being connected to confirm support.
2. The combined cable length for RS-422A/485 is 500 m including branch
lines.
3. The maximum cable length is limited to 2 m when an NT-AL001-E Link
Adapter is connected.
4. Branch lines must be a maximum of 10 m long.
5. Four-wire connections must be used for RS-422A/485 connections with
Host Link communications.
6. "Resistance ON" indicates that the terminating resistance must be turned
ON.
7. "5-V power" indicates that a 5-V power supply is required for the Link
Adapter. Refer to the Link Adapter manual for details. Be sure that the pow-
er supply has sufficient capacity and accuracy and wire it away from high-
power lines and another sources of noise. A 5-V power supply is not re-
quired for a Link Adapter connected to a Serial Communications Board or
Unit because power is supplied from pin 6 of the connector.
8. The maximum baud rate of the NT-AL001-E Link Adapter is 64 Kbps. Do
not use 115.2 Kbps when a Link Adapter is connected.
Required
devices
Any Serial
Communica-
tions Board or
Unit
Communica-
tions Unit:
Controller Link
Unit or Ether-
net Unit
Gateway or bridge
Network 2
Section 1-5
Connected Possible com-
serial mand flow
port/Remarks
Port 1 or 2 Host computer
to PLC:
FINS
commands only
PLC to Host
computer:
FINS
or
commands only
(RS-422A/485:
4-wire only)
Network 3
Gateway