Eaton XC-303 Series - Page 31

1 Description of the Modular PLCs XControl: XC-104-…, XC-204-…, XC-303-…
1.6 Functionality
26 Modular PLCs XControl: XC-104-…, XC-204-…, XC-303-… 01/23 MN050005EN Eaton.com
Table 4 PLUG-FMC-3S spring-loaded plug-in terminal block with RS-485 interface pinout
Activating the bus termination resistors
The first and last stations on the RS-485 cable must be terminated with a bus
termination resistor.
To activate the bus termination resistors for the RS-485 cable, switch the fol-
lowing two DIP switches on S1 to the ON position:
• XC-303-…: TRSa and TRSb
• XC-104-…, XC-204-…: 3 and 4
Figure 9: DIP switch S1 on XC-303-… and XC-104-…/XC-204-…
l
Figure 10: Activating the bus termination resistors for the RS-485 interface
.
RS485 cable
• Use the specified connection cable assembled by electrically qualified
personnel only.
Plug connector X1 (XC-104-…, XC-204-…)
X3 (XC-303-…)
RS485
1
Data cable A
2
Data cable B
3
GND RS485
XC-303-… XC-104-…and XC-204-…
TRSa and TRSb 3 and 4
1
2
3
ON OFF
S1
STOP
TRSa
TRSb
TC1
TC2
ON
1
2
3
4
5
OFF
1STOP
2SF
3
4
TRSa,
TRSb
5TC
+5 V
S1 X3
390 Ω
220 Ω
390 Ω
RS485 b
RS485 a
GND
TRSa
TRSb
ON OFF
S1
STOP
TRSa
TRSb
TC1
TC2