HB-37350-810-01-50F-EN PSC1-C-10 Installation manual V2.1.docx Page 89 of 189
Version: 50F
4.3.5.2.2 Single-channel circuit with testing
On the usage of a dual-channel output (IQQx) in conjunction with an external single-channel
circuit with testing. In particular, positively driven auxiliary contacts are required for
electromechanical devices, or valve position signal contacts are required for this purpose for
hydraulic or pneumatic components. A signalling/warning device for the indication of the failure
is required. The signalling/warning device must immediately make clear the hazardous
situation to the operator.
The achievable PL is heavily dependent on the test rate, a maximum of PL d according to EN
ISO 13849-1 can be achieved!
IQQ02
X21
X12
IQQ03
IQQ04
IQQ05
NC
NC
Y0
Y1
X13
IQI00
IQQ01
T0
T1
L +
L -
Dual-channel output with single-channel circuit with testing
Safety instructions:
Only recommended to a limited extent for safety applications! On this topic see also the
information in EN ISO 13849-1 on usage and the fault exclusions necessary.
For PL cn/Kat 2 or higher a test rate > 100 * demand rate is required
Alternatively, testing of the safety function can now also be carried out immediately
upon request, if the total time required to detect the failure and to transfer the machine
to a safe state (usually the machine is stopped) is shorter than the time required to
reach the hazard.
For PL c and higher a signalling/warning device is required that immediately makes
clear the hazardous situation to the operator
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