Siemens Welding System ST PCS 7 Manuale Utente

Siemens ST PCS 7 · November 2007

5

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1)

If every OS client has access to all OS servers/pairs of servers

Process object 

(PO)

A process object (PO) is a synonym for an opera-

ble and observable block with approx. 30 to 50 

individual OS variables (parameters). Thus the 

quantity framework data of the engineering sys-

tem can be compared with those of the operating 

system.

OS variable

An OS variable 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.). A PO usually has several OS variables 

(which can be operated and monitored).

Licensing

As of SIMATIC PCS 7 V7.0, the OS software will 

only be licensed on the basis of POs. This signifi-

cantly simplifies calculation of the required 

license. An average of 50 OS variables will be 

calculated for a PO, where motors, valves etc. 

require fewer variables, and controls, dosing 

functions etc. require more variables. Checking of 

the license will also be carried out using the POs, 

and additionally includes checking of the total 

number of OS variables used. 
Every block fulfilling the following criteria is 

counted and calculated as a PO:
• It is not a driver block.
• It can be operated and monitored.
• It can send messages.

250

12500

1000

50000

2000

100000

3000

150000

5000

250000

8500

425000

Max. number of OS servers / pairs 

of servers

12

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)

32

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

5000 POs

• Per OS server

8500 POs

Max. number of configurable mes-

sages per server/single station

150.000

Number of process tags
• Per OS single station

Approx. 3000

• Per OS server

Approx. 5000

• Per multi-user system

Approx. 60000

(cyclic buffer), based on Microsoft 

SQL server, for:
• Process value archiving (per 

OS server / single station)

Approx. 1000/s

• Message archiving 

(per OS server / single station)

Steady-state load approx. 10/s 
Message peak approx. 3000 / 4 s

• Process value archiving with 

StoragePlus

Process values from up to 4 sin-

gle stations, servers or pairs of 

servers

- Process values of one server

Approx. 1000/s

- Process values of all servers

Approx. 1600/s

• Process value archiving with 

central archive server (CAS)

Process values from up to 11 

servers or pairs of servers

- Process values of one server

Approx. 1000/s

- Process values of all servers

Approx. 10000/s

© Siemens AG 2007