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Design, Functions and Operation
2.3
Internal Functions
2.3.1
Integral Real-Time Clock
The integral real-time clock enables you to manipulate and control non-failsafe process sequences
on a time-dependent basis, offering the following possiblities:
•
Clock-time and calendar function
This function allows you, for example, to determine exactly the point in time at which an error
caused the S5-95F to go into the STOP mode.
•
Interrupt or time interrupt function
This function allows you, for example, to monitor the duration of a process.
•
Operating hours counter
This function allows you, for example, to monitor inspection intervals.
2.3.2
Diagnostic Byte
The diagnostic bytes (IB 35, 60 to 63) give you an additional possiblity to control the process
sequence.
The diagnostic bytes display:
•
Whether or not a counter has reached its comparison value
•
Whether or not an interrupt was triggered
•
Whether or not the power supply for the onboard I/Os has failed
•
Whether or not battery backup is available.
2.3.3
Communication Byte
The communication bytes (IB 56 to 59) offer you the possibility to control the sequence of interrupt
handling. You can evaluate the states of the interrupt bytes in the communication bytes.
2-4
S5-95F
EWA 4NEB 812 6210-02
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