Siemens SIMATIC PANEL PC 877 - Manual (Page 274)

Glossary
SIMATIC Panel PC 877
Glossary-4
Operating instructions, Release 07/2006, A5E00877780-01
Gender changer
Using the gender changer (25-pin / 25-pin), the COM1/V24/AG interface of the SIMATIC PC
family can be converted to the usual 25-pin male connector.
Hard disks
Hard disks represent a form of magnetic disk storage medium (Winchester drives, hard
disks) with integrated magnetic disks.
Hot swapping
The SATA interface gives the device's hard drive system hot-swap capability. The
prerequisite for this is a RAID1 system, comprising a SATA RAID controller (onboard or as a
slot board, and at least two SATA swap frames. The advantage of hot swapping is that
defective hard disks can be replaced without the need for rebooting.
Hub
A term in network technology. In a network, a device joining communication lines at a central
location, providing a common connection to all devices on the network.
Hyper Threading
HT technology enables the parallel processing of tasks. HT is only effective when all relevant
system components, such as processors, operating systems and applications are supported.
Image
This refers to the image, for example, of hard disk partitions saved to a file in order to restore
them when necessary.
Intel chip set 915 GM
The chip set organizes the data traffic between the main processor, working memory, cache,
slots and other interfaces.
Functions of the 915 GM: Front side bus with 533 MHz, Intel® graphical media accelerator
900, support for up to 2 GB dual-channel DDR2 memories, Intel® High definition audio,
Intel® display power-saving technology 2 (Intel® DPST 2)
Interface
see Interface
Interface, multi-point
MPI is the programming interface of SIMATIC S7/M7. Allows central access to
programmable modules, text-based displays and OPs. The MPI nodes can
intercommunicate.