Siemens SIMATIC S5-115U, User Manual

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S5-115U Manual Technical Description
Not represented:
Operating System Submodule (only CPU 944)
As well as the PLC operating system, this submodule also contains driver blocks for the second
interface. They are loaded into the user memory of the interface after power restore.
Intelligent Input/Output Modules (IPs)
Intelligent input/output modules are available for handling the special tasks:
•
counting rapid pulse trains
• measuring and processing positioning increments
• measuring speed and time
• controlling temperatures and drives, and so on.
Intelligent input/output modules generally have their own processor and thus off-load the
CPU. Consequently, they can process measuring and open- and closed-loop control tasks
quickly while the CPU handles other jobs.
2.2 Functional Units
I/O bus
Functional
modules
Internal
program
memory
(RAM) ACCUM
Processor
Timers,
counters,
flags
PII
PIQ
Memory
submodule
(EPROM/
EEPROM/
RAM)
Serial
interface
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Input
modules
(digital/
analog) Output
modules
(digital/
analog)
CPU
Input/output modules
Figure 2-2. Schematic of the S5-115U
EWA 4NEB 811 6130-02b
2-3