BBH SMX Series - Diagnoses in the Cut-Off Circuit; Diagnostic Functions

Installation manual
HB-37420-810-01-25F-EN SMX100 Installation manual.docx Page 102 of 260
Version: 25F
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Single-channel output SMX with internal dual-channel processing (IQQ x)
and dual-channel actuator with dual-channel diagnose
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Dual-channel output SMX and dual-channel actuator
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4.3.2 Diagnoses in the cut-off circuit
The cut-off circuit is equipped with durably implemented and parametrizable diagnostics
functions. Certain diagnostics functions also include the external part of the cut-off channel.
Depending on the use of these diagnostics functions, different DC-values will arise.
4.3.2.1 Diagnostic Functions
Durably implemented diagnostics functions:
Cross-wise readback of outputs:
All safety outputs are read back in the complementary channel. Faults in the internal cutout circuit
of the SMX module are thus detected with DC = High.
Test of cutout ability for Q 5 und Q 6 (only control of relay), Q 1, Q 2,
Q 3, Q 4:
The cutout ability of these outputs is cyclically tested. Failure of the cutout possibility is clearly
detected.
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