Installation manual
HB-37420-810-01-25F-EN PSC1-C-100 Installation manual - V2.2.docx Page 88 of 201
Version: 25F
4.3.5.2.2 Single-channel circuit with testing
When using a dual-channel output (IQQx) in conjunction with a single-channel external 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 c 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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