PNOZ s8
Operating Manual PNOZ s8
21400-EN-10
11
Feedback loop
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with PNOZsigma base unit:
The feedback loop is connected and evaluated via the connector.
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without PNOZsigma base unit:
Feedback loop does not need to be monitored because the contact expansion block
monitors its own output contacts.
Semiconductor output
*Connect together the 0V connections on all the external power supplies
INFORMATION
If a base unit and a contact expansion module from the PNOZsigma range
are linked via the connector, no additional wiring is necessary.
Do not connect A1 to the contact expansion module!
Operation
When the relay outputs are switched on, the mechanical contact on the relay cannot be
tested automatically. Depending on the operational environment, measures to detect the
non-opening of switching elements may be required under some circumstances.
When the product is used in accordance with the European Machinery Directive, a check
must be carried out to ensure that the safety contacts on the relay outputs open correctly.
Open the safety contacts (switch off output) and start the device again for SIL CL 2/PL c at
least 1 x per year, so that the internal diagnostics can check that the safety contacts open
correctly.
NOTICE
The safety function should be checked after initial commissioning and each
time the plant/machine is changed. The safety functions may only be
checked by qualified personnel.
LEDs indicate the status and errors during operation:
LED on
LED flashes
