Technical data

Glossary
Software
System Manual, 07/2009, C79000-G8976-C222-07
461
STEP 7
The basic STEP 7 software is the standard tool for the SIMATIC S7, SIMATIC C7 and
SIMATIC WinCC automation systems.
Subnet mask
The subnet mask specifies which parts of an IP address are assigned to the network
number. The bits in the IP address whose corresponding bits in the subnet mask have the
value 1 are assigned to the network number.
TCO (TIM Connect)
The TCO component monitors the local TIMs connected over MPI or Ethernet, maps their
most important status displays on ST7sc tags, forwards received messages for message
decoding or transfers the messages to be sent to the relevant TIM for WAN communication.
TCP/IP
(Transmission Control Protocol / Internet Protocol)
Network protocols for connecting two computers in the Internet. IP is the basic protocol. UDP
is based on IP and sends individual packets. These can arrive at the recipient in a different
order from the order in which they were sent - they can even be lost. TCP is used to make
the connection reliable and makes sure, for example, that data packets are passed on to the
application in the correct order. In addition to the IP addresses, UDP and TCP also involve
port numbers between 1 and 65535 with which the various services can be distinguished.
On a Windows PC, the WINSOCK.DLL (or WSOCK32.DLL) is responsible for handling the
two protocols.
TD7, TD7onCPU, TD7onTIM
→ SINAUT TD7 Library
TIM
(Telecontrol Interface Module)
The TIM transmission processor is a communications module that handles all data
transmission functions provided by the SINAUT system independently. Depending on the
type, the TIM has one or two WAN interfaces, an MPI interface or an Ethernet interface.
Depending on the requirements, a variety of transmission equipment can be connected. The
module is supplied in an S7-300 housing.
The TIM is available in two basic variants: