Siemens simatic c7-621 Hardware Installation Manual page 125

C7 OP The C7 OP handles the OP functions of the C7. It is independent of the –>
C7 CPU and continues to operate if, for example, the C7 CPU changes to the
STOP mode. The C7 OP has its own MPI address and is connected to the C7
CPU via the MPI.
Chassis
Chassis ground includes all connected inactive parts of a device that cannot
carry a hazardous voltage even in the event of a fault.
Communications Communications processors are modules for point-to-point links and for
Processor
LAN connections –> CP.
Complete Restart
When a C7 CPU is restarted (for example, after selection of one of the C7
CPU Operating Modes in the System Functions menu or after turning the
power ON), the organization block OB100 (complete restart) is executed
before cyclic program execution (OB1). During the complete restart, the
process image of the inputs is read in and the STEP 7 user program is
executed starting at the first instruction in OB1.
Configuration
Assignment of modules to racks/slots and (for example, in the case of signal
modules) addresses.
Configuration
The configuration memory is a flash memory containing the configuration
Memory data and is integrated in the C7 OP.
CP Communications processors (CPs) are intelligent modules with their own
processor. They form an important group within the components of a
programmable controller. A distinction is made between various types of
communications processors depending on their tasks, for example, CPs for
signaling and logging, for point-to-point connections, for the operator
interface (COROS), for bus connections (SMATIC NET) and for diagnostics
and mass storage applications.
Cyclic Interrupt A cyclic interrupt is generated periodically by the C7 CPU at selected
intervals. It triggers execution of the assigned organization block.
D
Diagnostic Buffer The diagnostic buffer is a buffered memory area on the C7 CPU in which
diagnostic events are entered in the order in which they occur.
C7-621 / C7-621 AS-i Control Systems
C79000-G7076-C621-01
Glossary
Glossary-3