S5-95F Design, Functions and Operation
Table 2-1 gives information about the number and retentive characteristics (the internal memory
contents are retained/are not retained) of these timers, counters, and flags.
Table 2-1. Retentive and Non-Retentive Operands
*
Individual data words of DB252 to 254 are assigned default values by the operating system
64.0 to 255.7
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Flags, Counters, Timers, Data Blocks and System Data
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Retentive
0.0 to 63.7
Operand
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Flags
Counters
Timers
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Non-retentive
0 to 7 8 to 127
0 to 127
Data Blocks 1 to 255
*
System Data 0 to 255
Arithmetic Unit
The arithmetic unit consists of two accumulators, ACCU 1 and 2. The accumulators can process
byte and word operations.
Figure 2-4. Example of an Arithmetic Logic Unit's Mode of Operation
Load
information
from the PII
Transfer
information to
the PIQ
Process information
in ACCU 1 and 2
Accumulator Design
Figure 2-5. Accumulator Design
ACCU 1 ACCU 2
LowHigh
byte
LowHigh
byte
15 8 7 0
15
8 7
0
Processor
According to the control program, the processor calls statements in the program memory in
sequence and executes them. It processes the information from the PII and takes into consideration
the values of internal timers and counters as well as the signal states of internal flags.
External I/O Bus
The I/O bus is the electrical connection for all signals that are exchanged between the basic unit
external I/O and the S5-100U modules.
EWA 4NEB 812 6210-02
2-7
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