18
System Configurations Section 1-5
Note 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.
Host
computer
to
Network
PLCs, 1:N
Any Serial
Communica-
tions Board or
Unit
Port 1 or 2 Host computer
to PLC:
FINS
commands only
PLC to Host
computer:
FINS
commands only
(RS-422A/485:
4-wire only)
Communica-
tions Unit:
Controller Link
Unit or Ether-
net Unit
PLC:
Com-
puter
Connection configuration Required
devices
Connected
serial
port/Remarks
Possible com-
mand flow
Connection to Serial Communications Board or Serial
Communications Unit
Controller Link or
Ethernet network
or
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.
Host Link
Gateway or bridge
Gateway
Network 1
Network 2
Network 3
To Next Page
Loading...
Need help?
General
