Catalog ST PCS 7 - March 2007

■ Technical specifications
Definitions
Process A process object (PO) is a synonym for an operable
object (PO) and observable block with approx. 30 to 50 individual
OS variables (parameters). Thus the quantity framework
data of the engineering system 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 significantly 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.
Process
objects
OS variables (approx.)
250 12500
1000 50000
2000 100000
3000 150000
5000 250000
8500 425000
© Siemens AG 2007
Operator system
1) If every OS client has access to all OS servers/pairs of servers
Siemens ST PCS 7 · March 2007
Introduction
OS quantity framework
Max. number of OS servers / pairs 12
of servers
Max. number of automation systems 64
per OS server / pair of servers
Max. number of OS clients in multiclient
mode 1) 32
(per multi-user
system)
Max. number of monitors per 4
operator station with multi-channel
operation
Max. number of OS areas 64
Max. number of windows per 1 to 16 (adjustable)
monitor
Number of trends per trend window 10
Selection time for OS area display < 2 s
(100 process symbols)
Max. number of process objects:
• Per OS single station 5000 PO
• Per OS server 8500 PO
Max. number of configurable 50000
messages per server
Number of process tags
• Per OS single station Approx. 3000
• Per OS server Approx. 5000
• Per multi-user system Approx. 60000
Integral high-performance
archive system
(cyclic buffer), based on Microsoft
SQL server, for:
• Process value archiving (per Approx.1000/s
OS server / single station)
• Message archiving (per
Steady-state load approx. 10/s
OS server / single station) Message peak approx. 3000 / 4 s
Long-term archiving
• Process value archiving with Process values from up to
StoragePlus
4 single 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 Process values from up to
central archive server (CAS) 11 servers or pairs of servers
- Process values of one server Approx. 1000/s
- Process values of all servers Approx. 10000/s
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