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S5-115F Manual
2
Technical Description
This chapter describes the design and principle of operation of an S5-115F with accessories.
2.1
Modular Design
The S5-115F consists of various functional units that can be combined to suit the particular
problem. Figure 2-1 shows an S5-115F system.
The numbered information below briefly describes the most important components of the
S5-115F. The circled numbers refer to Figure 2-1:
Power Supply Module (PS 951)
The PS 951 power supply module generates the operating voltage for the programmable
controller from the 24 V DC power system voltage. This module use batteries or an external
power supply to back up the RAM.
The PS 951 power supply module also performs monitoring and signalling functions.
Central Processing Unit (CPU)
The central processing unit reads in input signal states, processes the control program, and
controls outputs. In addition to program scanning functions, the CPU provides internal
flags, timers, and counters.
You can diagnose errors using the LEDs of the CPU. Use the Overall Reset switch on the CPU
to delete the RAM contents.
The control program can be transferred to the CPU using a programmer or a memory
submodule.
EWA 4NEB 811 6148-02
Figure 2-1. The S5-115F (Central Controller)
Technical Description
2-1
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