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Rockwell Automation Publication 450L-UM001F-EN-P - March 2022
Chapter 4 Safety Function
Manual (Re) Start
The manual start mode of operation (also known as restart interlock) helps
prevent the OSSD outputs from switching ON automatically after interruption
and clearance of the protective field or power-up. A manual start of the
GuardShield system is required. Startup of the system is accomplished
through a momentary N.O. push button or keyswitch. An orange status
indicator (RES) on the 450L safety light curtain receiver indicates that the
system is ready for manual restart.
Manual start is not available in GuardShield light curtains with ArmorBlock®
Guard I/O™ connectivity (5-pin bottom plug-in).
The Start button must be pressed a minimum of 50 ms. The maximum time for
accepting the start pulse is 5 seconds. If the pulse width is too short or too long,
the start function is not executed. The start reacts on the falling edge of the
start pulse.
Manual Cold Start
The manual cold start (also known as start interlock) helps prevent the OSSD
outputs from switching ON after power-up of the system, even when the
protective field is unobstructed. After each power-up, a one-time manual start
of the system is required for the GuardShield system OSSD outputs to enter
the ON state.
The Start button must be pressed a minimum of 50 ms. The maximum time for
accepting the start pulse is 5 seconds. If the pulse width is too short or too long,
the start function is not executed. The start reacts on the falling edge of the
start pulse.
After the initial power-up and manual start has taken place, the light curtain
system operates in the automatic start mode. Activation of this mode of
operation and selection of the starting method is through DIP switch settings.
An orange status indicator (RES) on the GuardShield receiver indicates that
the system is ready to be manually started.
Manual cold start is not available in GuardShield light curtains with
ArmorBlock Guard I/O connectivity (5-pin bottom plug-in).
Manual (Re) Start with Off Function
This start mode allows the OSSD outputs to be switched on manually (if the
protection field is unobstructed) and switched off manually. The OSSD
outputs can be manually turned OFF by use of the same momentary N.O. push
button or keyswitch that is used for manual start. When the OSSDs switched
off because of an interruption of the protective field, the protective field must
be cleared and the push button or key must be operated again
Configuration and activation of this mode of operation is through DIP switch
settings. An orange status indicator (RES) on the GuardShield receiver
indicates that the system is ready to be manually started.
Power Cycle
When a GuardShield receiver goes into a lockout state, power must be cycled
after the cause of the lockout has been corrected. The Start input signal and the
Optical Push Button, can be used to cycle power. Press and hold the Start
button or the optical push button between 10...20 seconds. The power cycle
function is available for all start modes, including automatic.
