Definitions

OS tag

An OS tag or parameter is a defined memory location required for operating and monitoring with the operator system; values can be written into it and read from it (e.g. setpoint, actual value etc.).

Process object (PO)

A process object (PO) is synonymous with an operable and monitorable block. A PO usually has several OS tags (which can be operated and monitored). The number of OS tags differs depending on the block type. For example, motors or valves require fewer tags than closed-loop controls or dosing units.

Licensing

Licensing and license verification of the OS software for SIMATIC PCS 7 are based on the process objects.

Every block fulfilling the following criteria is counted and calculated as a PO:

• The block is not a driver block.
• The block can be operated and monitored.
• This block can handle messages.

The license verification also takes into account the sum of all OS tags used.

OS quantity framework

Max. number of OS single stations

8

Max. number of OS servers/pairs of servers

18

Max. number of automation systems per OS server/pair of servers

64

Max. number of OS clients in multi-client mode ¹⁾ (per multi-user system)

40

Max. number of monitors per operator station with multi-channel operation

4

Max. number of OS areas

64

Max. number of windows per monitor

1 to 16 (adjustable)

Number of trends per trend window

10

Selection time for OS area display (100 process symbols)

< 2 s

Max. number of process objects:

• Per OS single station

8 500 POs

• Per OS server

12 000 POs

Max. number of configurable messages per server/single station

200 000

Number of process tags

• Per OS single station

approx. 5 100

• Per OS server

Approx. 7 000

• Per multi-user system

Approx. 126 000

Integral high-performance archive system

(cyclic buffer), based on Microsoft SQL server, for:

• Process value archiving (per OS server / single station)

Approx. 1 500/s

• Message archiving (per OS server / single station)

Steady-state load approx. 10/s
Message peak approx. 3 000 / 4 s