HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 93 of 189
Version: 50F
4.3.5.2.5.2 Dual-channel circuit in different groups
IQQ00
X12
X21
IQQ01
T0
T1
L+
L-
IQQ02
IQQ03
IQQ04
IQQ05
IQQ06
IQQ07
IQQ08
IQQ09
X22
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
D
, PFH figures, B10d value etc.) is to be
used.
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.
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