SC143-C1 user manual
IEC-line by OVERDIGIT Page 4
The reset push button allows the CPU to restartwithout turning off the power. In this case there
will be a momentary loss of communication on all available ports.
The jumper for forcing the STOP state of the PLC program can be inserted either during the
execution of the program both before providing power. In the last case you can block the
automatic execution of any wrong program to allow its removal, for example, via the FTP
connection.
The USB +5V power jumper connect the power supply on the USB port to use the USB memory
stick (Host mode). When using the USB portfor PC programming (Device mode), disconnect the
jumper to avoid conflicts between the power supplied through the cable from the PC and the
power supplied from the CPU.
The signaling leds, as a couple green/yellow, indicating the connection/activity status of the
Ethernetport and the RUN/STOP of the PLC program.
4. Electrical connections
The SC143-C1 power supply requires a 24Vac/dc and a ground wire connecting the terminal block
provided also for the RS485 fieldbus.
Take care to make a good ground connection, either through the terminal, either through the
screws, making sure that there is an extensive contact with any metal structure which is attached
with the M4 screws.
For the RS485 fieldbus connection must be used appropriate cables (shielded and twisted pair)
taking care toconnect the shield to the ground, on the SC143-C1 side, directly on the possible
metallic frame of the cabinet. The RS485 interface, galvanically isolated, also has an additional 0V
wire to be connected to the reference terminal of the expansion interfaces in order to constrain
the references of the respective hardware drivers.
