Changes, Tracking Changes, And Acceptance; General Information - Siemens SIMATIC PCS 7 Operating Manual

Changes, tracking changes, and acceptance

9.1

General information

Operational procedures
During maintenance work in or while making changes to a plant, the operational procedures
must be followed at all times.
Before changes can be made to safety-related parts of the plant or functions, a risk
assessment relating to the change itself and how it is to be made must be carried out,
particularly if it is to be made during operation. Only make changes if a risk assessment has
been carried out beforehand and ensure that change instructions resulting from this are
followed. If necessary, test program changes by loading them into a test CPU and checking
the function.
An S7-400 F/FH system being operated as a safety system is protected by at least two
passwords. Make sure you have the required access authorizations.
Note
You can find more information in section Access protection (Page 15).
If changes are to be downloaded during operation, safety mode must be deactivated on the
AS and then reactivated once downloading is complete.
Note
You can find more information in section Safety mode and downloading the safety program
(Page 121).
Compendium Part B - Process Safety (V8.2)
Operating Manual, 07/2016, A5E35031794-AB
9
173