Siemens S7-400 Central module, Chassis Ground, Cold restart, Communications Processor, Compress

Glossary

C

Central module

Programmable S7-400 module with MPI interface, controls the automation tasks.

Chassis Ground

The chassis ground comprises all interconnected inactive parts of an apparatus, which even in case of a fault cannot take dangerous touch voltages.

Cold restart

Restart of an automation system and its user program after all dynamic data ( tags of the I/O image, internal registers, timers, counters etc. and the corresponding program elements) were reset to default. A cold start may be triggered automatically (for example, due to power failure, loss of dynamic data in memory).

Communications Processor

Communications processors are modules for point-to-point and bus connections.

Compress

The PG online function “Compress” is used to shift all valid blocks in the RAM of the CPU evenly and without any gaps to the beginning of the user memory. All gaps caused by deleting or correcting blocks are thus removed.

Configuration

The configuration is the selection and putting together of the individual components of a programmable logic controller (PLC).

Configuring

Configuring is the assigning of modules to racks or slots and (with signal modules) addresses.

Consistent data

Data associated with each other in the same context and which may not be separated

All values of analog modules must be treated as consistent data, for example. That is, a value read at different times from an analog module may not be corrupted.

Glossary-2	Automation System S7-400	Hardware and Installation
		A5E00850741-01