Installation manual
PSC1-C-10 Installation manual V2.6
Page 64 of 173
Version: 57E
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:
Crosswise 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.
