Siemens S5-135U/155U System Manual page 193

Organization blocks OB
Integrated special function organization
blocks OB
Integrated serial interface
Optional serial interface
Backplane bus
Dimensions (w x h x d)
Weight
System Manual
C79000-G8576-C199-06
CPUs, Memory Cards, Memory Submodules, Interface Submodules
OB 1 to 39 (interfaces for operating system)
See Pocket Guide
PG interface
Via interface submodules, optionally as V.24, TTY, RS 422A/485 or
PG interface
SINEC L1 interface from Version 6ES5 928-3UB12
S5 bus
40.64 x 233.4 x 160 mm
Approx. 1 kg
5-53