PNOZ s22
Operating Manual PNOZ s22
22170-EN-04
8
For your safety
The unit meets all the necessary conditions for safe operation. However, please note the
following:
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Note for overvoltage category III: If voltages higher than low voltage (>50 VAC or >120
VDC) are present on the unit, connected control elements and sensors must have a
rated insulation voltage of at least 250 V.
Unit features
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Positive-guided relay outputs:
–
6 safety contacts (N/O), instantaneous
–
2 auxiliary contacts (N/C), instantaneous
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3 safety contacts and 1 auxiliary contact each; these can be controlled separately
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LED indicator for:
–
Input state of channel Ext.1/O0
–
Input state of channel Ext.2/O1
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Plug-in connection terminals (either spring-loaded terminal or screw terminal)
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See order reference for unit types
Safety features
The unit meets the following safety requirements:
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The contact expander module expands an existing circuit. As the output relays are
monitored via the base unit's feedback loop, the safety functions on the existing circuit
are transferred to the contact expander module.
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The safety function remains effective in the case of a component failure.
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Earth fault in the feedback loop:
Detected, depending on the base unit that is used.
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Earth fault in the input circuit:
The output relays de-energise and the safety contacts open.
