Siemens ST PCS 7 manual Definitions, Process objects OS variables approx, OS quantity framework

© Siemens AG 2007

Operator system

Introduction

■Technical specifications

Definitions

Process object	A process object (PO) is a synonym for an opera-
(PO)	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.
Process objects	OS variables (approx.)
250	12500
1000	50000
2000	100000
3000	150000
5000	250000
8500	425000

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 multi-	32
client mode 1)
(per multi-user system)
Max. number of monitors per	4
operator station with multi-channel		5
operation	64
Max. number of OS areas
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 POs
• Per OS server
	8500 POs
Max. number of configurable mes-	150.000
sages per server/single station
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	Steady-state load approx. 10/s
(per OS server / single station)	Message peak approx. 3000 / 4 s
Long-term archiving
• Process value archiving with	Process values from up to 4 sin-
StoragePlus	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	Process values from up to 11
central archive server (CAS)	servers or pairs of servers
- Process values of one server	Approx. 1000/s
- Process values of all servers	Approx. 10000/s

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

Siemens ST PCS 7 · November 2007

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