Rockwell Automation Allen-Bradley GuardShield 450L-B4FNxYD

Rockwell Automation Publication 450L-UM001D-EN-P - December 2019 27
Chapter 4
Safety Function
The 450L safety light curtain offers a range of functions that are integral to the
safety system. The functions are selected through DIP switch settings on the
receiver plug-in.
A confirmation of a new configuration at the receiver stick is only required if the
stick was previously operated with another DIP switch setting or with another
plug-in type (see Confirmation of a New System Configuration on page 64
).
A confirmation of a new configuration at the transmitter stick is only required if
the stick was previously operated with another beam coding (see Beam Coding
on page 30).
Some safety functions can only be selected with the 450L-E safety light curtain.
A complete overview is provided in Tab le 1 on pag e 11
.
Start Modes
The four start modes are configurable for both GuardShield product lines
(450L-B and 450L-E). Manual reset options are only provided for eight-pin
connection plug-ins. 5-pin plug-ins have only the automatic (re)start option.
Automatic (Re) Start (Default)
When in the automatic start mode of operation (also known as Guard only
mode), the light curtain operates as an on/off device. The OSSD outputs switch
off, according to an interruption of the sensing field, and automatically switch on
when the protective field is cleared. The GuardShield pairs that are equipped
with bottom plug-ins and factory-default DIP switch settings work in Automatic
Start mode.
ATTENTION: The protective system must be tested for proper operation after
each change to the configuration.
IMPORTANT The Start button can also be used to power cycle a receiver stick if there is a
lockout. A receiver stick performs the power off/on cycle if the input of the
Start button is activated for a minimum of 10 seconds, but not longer than
20 seconds. This function is also available if automatic start is configured for
receiver plug-ins, which allow a start mode selection, see Restart Button on
page 100 for additional installation hints.