Siemens S5-135U/155U - Manual (Page 258)

5-118
System Manual
C79000-G8576-C199-06
5.11.6 SINEC L1 Submodule
The SINEC L1 submodule is for use with data transmission via the
SINEC L1 bus.
The SINEC L1 submodule can be inserted in the following CPU:
Interface Submodule ... For Use With ...
SINEC L1 submodule CPU 928B, from Version 6ES5 928-3UB12
CPU 948
The SINEC L1 submodule is equipped with a transmitter and a receiver for
20 mA current loop signals. Shown in the following figure is the circuitry for
the current loop signals:
Transmitter
–
+
+
–
–
Receiver
Current Direction Arrows
Partner
+
Receiver
+
–
Transmitter
CPU with
SINEC L1
Submodule
–
+
–
+
Figure 5-28 SINEC L1 Submodule: Loop Current Direction
Data transmission via the SINEC L1 interface always takes place at
9600 bps.
Application
Circuitry
Data Transmission
Rate
CPUs, Memory Cards, Memory Submodules, Interface Submodules