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Siemens ST PCS 7 · 2017 (Preliminary edition)
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Function
(continued)
Operator System
OS Software
OS Standard Software for Single Station/Server/Client
Data archiving
The high-performance archiving system, configurable at run-
time, in the OS standard software of OS Single Stations and
OS Servers temporarily records process values and messages/
events (alarms) in cyclic archives. Intervals of approximately 1 to
4 weeks for process values and approximately 2 months for
alarms are typical for this short-term archiving. Data from the
cyclic archives can be exported time-controlled or event-con-
trolled to the Process Historian for permanent archiving. See the
"Process data archiving and reporting" section for information on
this.
Central user administration, access control and
electronic signature
With SIMATIC Logon, the operator system has central user ad-
ministration with access control that complies with the validation
requirements of 21 CFR Part 11. The administrator can divide
the users into groups and assign differently defined access
rights (roles) to these groups. The operator obtains the specific
rights when logging on within the scope of the access control.
Apart from the keyboard, an optional smart card reader, for
example, can be used as the logon device. In addition,
SIMATIC Logon offers the "electronic signature" function.
SIMATIC Logon is fully integrated in SIMATIC PCS 7. In the
context of SIMATIC PCS 7, no software licenses need be
ordered for this. For more information on SIMATIC Logon and
ordering data for an optional smart card reader, see "Expansion
components, smart card reader" in "Industrial Workstation/IPC",
see page 3/52
.
Time-of-day synchronization
TC400 central plant clock
Together with a SICLOCK time generator (see catalog "Add-ons
for SIMATIC PCS 7"), the operator system of the SIMATIC PCS 7
process control system can implement the system-wide syn-
chronization on the basis of UTC (Universal Time Coordinated).
This feature is especially beneficial for widely distributed plants
present in different time zones, e.g. pipelines.
© Siemens AG 2017