Siemens SINAUT ST7 System Manual page 281

OPC
(OLE for Process Control)
OPC includes a series of specifications for data exchange in automation engineering
between controllers, alarm transmitters etc. and control systems.
Organizational message
Organizational messages are used to execute organizational system functions.
These include, for example:
● General requests
● Time synchronization
● Counted value storage
● Coordinated connection establishment and termination in a dial-up network
● Message indicating station startup and station failure
● Requests for and transmission of subscriber records
Parameter assignment
A device is assigned the parameters it requires for starting up when it is supplied with data.
Permanent call
A permanent call does not interrupt the normal polling cycle; it is always executed alternating
with the standard poll from the normal polling cycle.
PG / programming device
A PG is a personal computer designed specifically for use in industry. A PG is fully equipped
for programming SIMATIC automation systems.
PG Routing
Using PG routing, it is possible to access programmable modules or modules with diagnostic
capability beyond network boundaries from a programming device (PG) or computer (PC).
PLC
Programmable logic controller
Polling
Polling is a method of SINAUT data transmission in which a → master TIM controls the data
exchange in the telecontrol network.
Using a polling message, the master TIM instructs the connected stations (station TIMs) one
after the other to transmit their stored data messages to the master TIM. If a polled station
Station control system
System Manual, 07/2009, C79000-G8976-C178-07
Glossary
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