Functional Safety KFD2-RSH-1.2E.L*(-Y1)
Operation
2019-12
17
5.1 Internal Diagnosis
With enabled internal fault detection a diagnostic coverage of 81.2 % is achieved.
Monitor one of the 4 possible ways of fault detection:
• Input impedance change
1
• Fault indication output
• Collective error message output
• LED indication
The device has three output relays. To ensure a complete diagnosis, three switching
operations are necessary. You have 2 options to achieve the diagnostic coverage, see step 2
of the following section.
Internal Diagnosis Procedure
1.
Enable the internal fault detection. See chapter 4.2.1.
2. You have 2 options to achieve the diagnostic coverage:
• Switch on the output manually three times.
or
Observe whether the output switches on three times during the normal operation.
or
• Check the output function at periodic intervals. Switch on the output at least three times a
year as described in the steps 1 and 2.
1
In this case only use a safety PLC with digital output and line fault detection.
Note
Maintain a distance of at least 2 s between the switching processes.
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