Datasheet

Relays for functional safety
Safety relays PNOZsigma
PNOZ s20
Pilz GmbH & Co. KG, Felix-Wankel-Straße 2, 73760 Ostfildern, Germany
Telephone: [phone], Telefax: [phone], E-Mail: [e-mail]
2016-09
793
Function description
The contact expansion module PNOZ s20 also provides safety outputs. It is driven by a
base unit PNOZsigma.
Several PNOZ s20 units can be connected to the base unit (see Installation [ 793]).
Functional procedure after supply voltage has been applied and the base unit's safety con-
tacts are closed:
} There is a high signal at safety outputs 14 and 24 and auxiliary output Y32.
} LEDs "IN1", "IN2" and "Out" are lit.
Functional procedure if one or both of the base unit's safety contacts open:
} There is a low signal at safety outputs 14 and 24 and auxiliary output Y32.
} LEDs "IN1", "IN2" and "Out" go out.
The safety outputs will not switch back to a high signal until all the base unit's safety con-
tacts are open and then closed again.
Safety outputs are checked via regular off tests.
} Max. duration of off time during self test, see Technical details
} Safety outputs are switched off for the duration of the off time during the self test.
The auxiliary output Y32 displays the state of the safety outputs.
Installation
Control cabinet installation
} The safety relay should be installed in a control cabinet with a protection type of at least
IP54.
} Use the notch on the rear of the unit to attach it to a DIN rail.
} Ensure the unit is mounted securely on a vertical DIN rail (35 mm) by using a fixing ele-
ment (e.g. retaining bracket or an end angle).
Push the unit upwards or downwards before lifting it from the DIN rail.
Connect the base unit and contact expansion module PNOZ s20
} Remove the plug terminator at the side of the base unit and at the left of the contact ex-
pansion module.
} Connect the base unit and the contact expansion module using the connector supplied,
before mounting the units to the DIN rail.
Connect the contact expansion module PNOZ s20 to the contact expansion modules
PNOZsigma
} Connect the contact expansion modules using the connectors supplied.
} Fit the terminator to the module on the right.
} Expansion options are described in the following table.