Pilz PSEN op4F-A-14-180/1 - Manual (Page 68)

PSEN op4F/H-A series OPERATING MANUAL
68 1003067-EN-02
7.10 Cascading
An internal communication bus can be used to cascade several pairs of light curtains with
each other. The normal connections at the top and bottom of the light curtain are used with
the aid of a cascading cable. The OSSDs are only physically connected to the Master unit.
If transmission should fail due to a stuck-at fault or signal degradation, both the Master and
Slave units switch to a safe state.
A maximum of three units (Master and two Slaves) can be connected in a cascading
configuration: a maximum of 160 beams on models with a resolution of 30 mm and a
maximum of 320 beams on models with a resolution of 14 mm. The maximum length of the
Master unit is 1800 mm and the maximum length of each Slave unit is 1200 mm. The
corresponding cables must be used (see Chapter 14) to ensure that the units are connected
correctly in the cascading configuration.
An auto-recognition procedure is run on start-up; it automatically synchronizes the topology
of the cascading structure and the light curtains
.
To enable auto-recognition, the terminator cap (contained in the kit) must be connected to all
the light curtains of the cascading system, both in the transmitter and in the receiver unit.
Without this connection, a critical communication error will be generated in the Master and
Slave units.
7.11 PNP/NPN
The PNP/NPN function enables the user to inform the light curtain of the mode in which the
OSSDs are connected.
PNP configuration
In this configuration, the load is connected between the OSSD output and GND.
In normal operation, the output voltage of the OSSD is 24 V DC
If an opaque object interrupts the beams, the OSSDs switch from 24 V CD to 0 V DC
Fig 56 PNP connection