schmersal PSC1-C-10 Series Installation Manual page 81

Installation manual
4.3.5.2.5.2 Dual-channel circuit in different groups
X12
IQQ00
IQQ01
T0
T1
X21
IQQ02
IQQ03
IQQ04
IQQ05
X22
IQQ06
IQQ07
IQQ08
IQQ09
L+
L-
Redundant dual-channel outputs in different groups in conjunction with dual-channel shutdown circuit
Safety instructions:
•
For the safety-related assessment of the output sub-system, on the usage of external elements
in the shutdown circuit, e.g. for increasing the switching rating, 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 increasing the switching rating 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 device for increasing the switching rating to switch is to be checked
cyclically. The interval between two 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.
PSC1-C-10 Installation manual V2.6
Version: 57E
, PFH figures, B10d value etc.) is to be used.
D
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