Safety instructions
2.4 Risk analysis of the plant
Extension Units KPxx
28
Operating Instructions, 05/2019, A5E43600360-AC
2.4
Risk analysis of the plant
Note
Risk analysis in an F-system is always required
A risk analysis must be performed for each F-system. The responsibility lies with the
operator of the plant.
The following rules apply to the risk analysis of the plant:
●
ISO 12100-1 and ISO 12100-2, General design guidelines for machines
●
ISO 13849-1, Safety of machinery - Safety-related parts of control systems - General
principles for design
●
ISO 14121-1, Safety of machinery – Risk assessment – Part 1: Principles
The results of the risk analysis leads to the Performance Levels a to e in accordance with
ISO 13849-1, which indicates how the safety-related system components must be designed
if the stop or emergency stop functions are needed locally in a plant segment or globally
throughout the plant and which operating mode is to be used for the devices in a safety-
related plant area.
Take the plant configuration as a whole into consideration in the risk analysis and not just the
individual areas. Additional information on risk analysis and risk mitigation is available at:
"Safety Technology in SIMATIC S7" system manual
http://support.automation.siemens.com/WW/view/en/12490443
2.5
Important information on the emergency stop button
WARNING
Stop functions of Category 0 or 1 according to EN 60204-1
If the emergency stop button is looped as a stop button in the stop circuit of the system, the
following applies:
If a category 0 or 1 stop circuit is implemented, the stop function must be effective
regardless of the operating mode. A category 0 stop must take precedence. Releasing the
emergency stop button must not lead to a dangerous state (see also EN 60204-1,
Section 9.2.5.3).
The stop function is not to be used as a replacement for safety equipment.
