S-Bus On Rs-485 - SBC PCD7.D4 Series Manual

Saia-Burgess Controls AG
2.5.2

S-Bus on RS-485

PCD7.D4xx
X5
Pining nr of each PLC connected is defined in their dedicated manual.
Termination resistors for proper End of line
In the example below, you see a possible interconnection between terminals and
PLCs. In order to avoid reflexions on the communication line please terminate the
network with termination resistors. On the PCD7.D4xx, a switch is avaiable:
First station
PCD1.M110
Port #1
Pull up
330 Ohm
Termination
Resistor
150 Ohm
Pull down
330 Ohm
The next image shows you where it is located.
→ When the switch is placed on the top position, the network is closed.
→ When the switch is placed on the bottom position, the network is open.
RS-485 switch
End Termination Switch
Manual PCD7.D4xx │ D ocument 26-851 ENG12 │ 2 016-02-05
PCD3.M3/M5
Port #2 or 1 with PCD3.F110/F150
Middle stations
PCD1.M1xx
PCD2.Mxx0
+5 V
n
12
Bus RS485
11
PCD1:M125/135
Port #1
RS-485 Network connection
PCD1.M1xx
PCD2.Mxx0
/n n /n
/RX - /TX
RX - TX
Segment length max. 1200 m
max. 32 stations
Hardware-System Overview
Interface connection
PCD2.M150/M170/M480
Port #1 with PCD7.F110/F150 or Port 6 (M480)
End station
PCD7.D4xx
PCD1.M1xx
PCD2.Mxx0
+5 V
/n
n
2
2-6