F8651X spare CPU module PLC controller

F8651X spare CPU module PLC controller

Technical data of product parameters

We will use a simple example to explain what a safety-instrumented system refers to (Fig. 1). In our example, the F8651X
temperature of a reactor is controlled using a heat exchanger. The associated control loop is illustrated by the
temperature sensing point T10 connected to the control system (BPCS) and by control valve V1, which regulates the
flow rate of the heat exchanger. The safety-instrumented system is completely separated from the control loop with F8651X
its own sensor (T20), safety PLC, and control valve V2. This circuit monitors the temperature and closes valve V2 to
shut off the supply to the heat exchanger when the adjusted limit is exceeded. The circuit does not become active,
i.e. valve V2 is not actuated, while the plant operates within the permissible limits. Based on the risk analysis, a
clear goal must be set for the safety-instrumented system. This goal could be, for example: when temperature T1
is reached, valve V2 is to be closed within five seconds with a maximum seat leakage rate of 2 %. Usually, it is
necessary to specify the closing time and seat leakage rate required to achieve the safety goal. Further specifications can be added as needed. F8651X
The safety-instrumented system is to be assessed concerning its probability of failure on demand (PFD). The PFD
goal to be achieved is specified in the risk analysis. In process engineering, circuits and instruments are commonly rated according to SIL 2 (Safety Integrity Level), a minority also according to SIL 3. In accordance with VDI 2180,
it is to be proven in three steps that an instrument is suitable for the intended purpose:

Product picture display

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