S5-90U/S5-95U
Technical Description
2.3
Principle of Operation of the PLCs
This section briefly describes the PLC's functional units processing your STEP 5 program.
2.3.1
Functional Units
Figure 2-7. Functional Units of the PLCs
a a a a a a a a a a a
a a a a a a a a a a a
a a a a a a a a a a a
a a a a a a a a a a a
a a a a a a a a a a a
a a a a a a a a a a a
a a a a a a a a a a a
a a a a a a a a a a a
S5-90U
S5-95U
Proces-
sor and
arith-
metic
unit
ROM
• Operating system
RAM
• STEP 5 program
• Timers
• Counters
• Flags
• PII/PIQ
Onboard I/Os
Programmer interface
Optional:
• SINEC L2 interface
• Second serial interface
E(E)PROM submodule
(can be plugged in)
S5-90U external I/O bus
The IM 90 is
required for
the S5-90U
only.
The S5-95U
can be
expanded by
connecting
S5-100U
modules
directly.
IM 90
S5-100U
module(s)
S5-95U external I/O bus
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2-7
Summary of Contents for SIMATIC S5-90U
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