Siemens Simatic S7-400 - Manual (Page 609)

Glossary
Glossary-3
S7-400, M7-400 Programmable Controllers Module Specifications
A5E00069467-07
Comparison point
Parameter in STEP 7 for analog input modules. Using this parameter, you can
determine the reference junction (the point where the temperature is known)
when thermocouples are used. The following can be reference junctions:
resistance thermometer on channel 0 of the module;
³
compensating box,
³ reference temperature.
Compensating box
Compensating boxes can be used for measuring temperatures with
thermocouples on analog input modules. The compensating box is a
compensation circuit for compensating temperature fluctuations at the
³
reference junction.
Configure
Select and put together different components on a programmable controller and
install the requisite software (for example, operating system on M7 automation
computer) and adapt to the specific use (for example, by assigning parameters to
the modules).
CP
³ Communication processor
CPU
The CPU (central processing unit) is a CPU module of the ³ programmable
controller that stores and runs the user program. It contains the operating
system, memory, processing unit and communication interface.
Data block
Data blocks (DB) are data areas in the user program that contain user data.
Global data blocks can be accessed by all code blocks, whereas instance data
blocks are assigned to a specific FB call.
Data, static
Static data is data that can only be used within a
³
function block. The data is
saved in an instance data block belonging to the function block. The data stored
in this way is retained until the next function block call.
Data, temporary
Temporary data are ³ local data of a block that are stored in the L stack during
execution of a block and that are no longer available after execution.