Operating instructions

Operating Instructions Chapter 4

C4000 Standard/Advanced

Subject to change without notice

Configurable functions

4.8.1 Fixed blanking

The C4000 Advanced safety light curtain is capable of fixed-blanking one or several

adjacent beams, e.g. to allow continued operation in spite of an obstruction such as a

table placed permanently in the light path.

The blanked area will no longer be part of the protective field. Objects to be blanked out

must therefore be permanently located inside the blanked area (). As soon as the object

is removed from the beam path, the safety light curtain will send a signal to stop the

dangerous movement ( ). Protection is otherwise no longer guaranteed.

 On devices with a physical resolution of 14 or 20 millimetres, you can set an area

positional tolerance for the fixed blanking of maximum ±2 beams. This is e.g. helpful

when blanking vibrating objects. The effective resolution of the light curtain does not

change due to the positional tolerance.

 In addition you can define a size tolerance of –1 beam, i.e. the blanked object is

allowed to be a maximum of 1 beam smaller.

 Depending on the size tolerance configured, the effective resolution reduces at the

edges of the blanked area as per Tab. 11. For this reason the moving area must always

be greater than the effective resolution at the edges of the area.

 If you configure a blanked area without positional and without size tolerance, the move-

ment of the object within the area is very limited before the safety light curtain may

change to red.

 The maximum selectable tolerance values depend on the size of the blanked area: The

actual tolerance expansion in millimetres differs. It depends on the physical resolution

of the device.

Device symbol C4000 Host (receiver), context menu Configuration draft, Edit, file card

Blanking of the appropriate system, option Type of blanking = fixed. Here you can also set

the positional tolerance and size tolerance directly in millimetres.

Increased size tolerance

You can configure an increased size tolerance of the fixed blanking. In this way objects can

pass through the protective field on one side of the fixed blanking, e.g. for material feed on

Fig.

Schematic layout of

the fixed blanking

Notes



Fig.

Schematic layout of

the fixed blanking with in-

creased size tolerance