Phoenix Contact IB IL 24 PSDO 8-PAC, User Manual, Page: 21 / 112

Product description
7619_en_05 PHOENIX CONTACT
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Requirements for con-
trolled devices/actuators
The error detection of the module varies depending on the parameterization. This results in
specific requirements for the actuators.
– If the outputs are parameterized with test pulses, the output circuits are tested by test
pulses at regular intervals. These test pulses are visible at the output and can trigger
undesirable reactions with quick responding actuators.
– Only use appropriately qualified actuators.
– Use reliable components. These include, for example:
– Use relays or contactors with forcibly guided N/C contacts to safely monitor the state
(pick-up, drop-out).
– Please observe any special environmental requirements in your application when se-
lecting the controlled devices.
– Please observe the applicable C standards in your application (e.g., EN 1010), in
which, for example, the number of controlled devices required to achieve a particular
category is specified.
WARNING: Unintentional machine startup
If the process does not tolerate this behavior, actuators with sufficient inertia must be
used.
In general, the load must not be so dynamic that it causes dangerous states within
1 ms.
Quick actuators which offer a safety-related response to pulses in under 1 ms must
generally not be used.
Note: Switching off the test pulses affects the error detection of the module. Please
observe the achievable safety integrity level, which is specified in Section “Connec-
tion examples for safe outputs” on page 55.
The failure detection time is 20 ms. Please refer to “Single-channel assignment of safe
outputs” on page 59 and “Two-channel assignment of safe outputs” on page 62 for
additional information.
– Control contactors according to EN 60947-4-1
– Power contactors
– Relays with force-guided contacts according to DIN EN 50205