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11.2
Auxiliary contacts
Auxiliary contacts
The auxiliary contacts of the 3RB24 solid-state overload relay are an NO contact and a
changeover contact switched downstream of the NO contact.
Response of the auxiliary contacts
The 3RB24 solid-state overload relay for IO‑Link has monostable auxiliary contacts. The auxiliary
contacts return to the initial state if voltage is not supplied.
Response to IO‑Link voltage failure
If the supply voltage fails, both internal relays drop out (95/96 open, 95/98 open). Depending on
whether the overload relay is controlled at this time via IO-Link or via the operator panel, the
relays assume different states when the supply voltage is restored:
1. Control via IO-Link (automatic mode)
When the supply voltage is restored, the control commands pending from the controller (IO-
Link master) are transferred direct and the relays are switched immediately.
2. Control via the operator panel (manual mode):
Relays remain in the drop-out state and must be closed again manually. Press the relevant
button (
After applying the control supply voltage again, the operator panel is in jog mode.
SIRIUS 3RB24 electronic overload relay for IO-Link
Equipment Manual, 07/2022, NEB969165602000/RS-AA/003
button or
WARNING
Automatic restart
Can result in death, serious injury, or property damage.
Automatic mode must not be used in applications where there is a risk of serious injury to
persons or substantial damage to property from an unexpected restart.
button) on the operator panel to activate the directions of rotation.
Diagnostics
11.2 Auxiliary contacts
103
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