Wiring the modbus
If the system is integrated into an existing ModBus system, it must be ensured that the terminating resistor is
activated on the communication module of the first user. In addition, a terminating resistor must be ensured by
the higher-level system.
7[
;
&
6
U
H
5[
7
7[
;
&
6
U
H
5[
7
7[
;
&
6
U
H
5[
7
# 1
# 2
# n
Terminating
resistor ON
Terminating
resistor OFF
Terminating
resistor OFF
Terminating
resistor ON
Superordinate
Modbus system
(Terminating resistor 120
Ohm)
Data +
(A)
GND
Data -
(B)
Electric components and wiring
7
Cascade / Modbus
Service manual SPS 4000 | B0960622_en
139