Siemens S7-400PLC Specifikace Strana 465

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Glossary
S7-400 Automation System Module Data
Reference Manual, Edition 09/2009, A5E00850736-06
465
Reference temperature
Parameter in STEP 7 for analog input modules. The reference temperature is the
temperature of the reference junction of thermoelements. The reference temperature allows
correct temperature measurement with thermoelements. The temperature of the reference
junction must be known because a thermoelement always detects the temperature
difference between the measuring point and the reference junction.
Repeater
Device for amplifying bus signals and for linking → bus segments over long distances.
Repetition accuracy
The repetition accuracy is the maximum deviation of the measured/output values when the
same input signal is applied or the same output value is specified repeatedly. The repetition
accuracy relates to the nominal range of the module and applies to the settled state (in terms
of temperature).
Resolution
With analog modules, this is the number of bits that represent the digitalized analog value in
binary format. The resolution depends on the module and, with analog input modules, on the
→ integration time. The longer the integration time, the more precise the resolution of the
measured value. The resolution including sign can be up to 16 bits.
Retentive memory
Data areas in data blocks along with timers, counters and bit memory are retentive when
their content is retained through a warm restart or power cycle.
S7 basic communication
Communication functions integrated in the CPU of SIMATIC S7/C7 that can be called up by
the user. These functions are called in the user program with → system functions. The user
data length is up to 76 bytes (small amounts of data). S7 basic communication is
implemented over → MPI.
S7 communication
Communication functions integrated in the CPU of SIMATIC S7/C7 that can be called up by
the user. These functions are called in the user program with → system function blocks. The
user data length is up to 64 Kbytes (large amounts of data). S7 communication provides a
network-independent interface between devices of the types SIMATIC S7/C7 and PG/PC.
Segment
→ Bus segment
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