schmersal PSC1 Series Installation Manual page 84

Installation manual
4.3.5.2.5.2 Dual-channel circuit in different groups
X12
IQQ01
IQQ02
T1
T2
X21
IQQ03
IQQ04
IQQ05
IQQ06
X22
IQQ07
IQQ08
IQQ09
IQQ10
L+
L-
Figure: Redundant dual-channel outputs in different groups in combination with dual-channel
shutdown circuit
Safety instructions:

For safety-related assessment of the output sub-system, on the usage of external
elements in the shutdown circuit, e.g. for switching amplification, the information from
the manufacturer (MTTF

The DC values stated in the table are to be used conservatively and compliance with
the boundary conditions (see "Comments" in table) ensured.

Fault exclusions are allowed according to the applicable standards. The boundary
conditions listed are to be ensured over the long-term.

On the usage of elements for switching amplification in safety circuits, the function of
these elements is to be monitored using suitable readback contacts etc. (see example
circuits). Suitable readback contacts are contacts that are forced to switch with the
contacts in the shutdown circuit.

The ability of the external switching amplifier to switch is to be checked cyclically. The
interval between 2 tests is to be defined to suit the requirement based on the
application and safeguarded by means of suitable measures. Suitable measures can
be of an organisational (switching off and on at the start of the shift etc.) or technical
(automatic, cyclic switching) nature.
HB-37350-810-01-38F-DE PSC1-C-10 Installation manual V1.1.docx
Version: 38F
, FIT figures, B10d value etc.) is to be used.
D
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