HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 75 of 189
Version: 50F
4.3.2 Diagnostics in the shutdown circuit
The shutdown circuits have diagnostic functions with a fixed implementation and diagnostic
functions that can be configured. Certain diagnostic functions also include the external part of
the shutdown circuit. The various DC values are dependent on the usage of these diagnostic
functions.
4.3.2.1 Diagnostic functions
Diagnostic functions with fixed implementation:
Cross-wise readback of the outputs:
All safety outputs are read back in the complementary channel. Faults in the internal shutdown
circuit in the PSC1 module are therefore detected with DC = high.
Testing the shutdown capability for Q4 and Q5 (only operation of the relay), Q0, Q1, Q2,
Q3:
The shutdown capability of these outputs is tested cyclically. The failure of the ability to shut
down is detected unambiguously.
Diagnostic functions that can be configured:
Readback of the actuator status via auxiliary contacts, position indicators etc.:
The actual status of the actuator is acquired and compared with the required status by reading
back suitable auxiliary contacts or position indicators. In this way a deviation is detected
unambiguously.
Note:
The DC is dependent on single-channel or dual-channel diagnostics as well as the switching
frequency.
Testing the shutdown capability for IQQx, Q0 – Q3:
The shutdown capability of these outputs is tested cyclically after the activation of the function.
The failure of the ability to shut down is detected unambiguously.
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