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OMRON Scientific Technologies Inc.
51
© OMRON STI 0613 PN99804-0060 Rev. B
14 G
LOSSARY
14
1 4 . 1 G
L OS S A RY
D
E F I NI T I ON S
Automatic Start:
Upon completion of power-up, the ESPE will enter the MACHINE RUN state as soon
as the detection zone is clear of opaque objects of the specified size.
Detection Zone:
The IR light sensing area of the ESPE. When a specified test piece enters this area then
the ESPE must detect its presence and set its safety outputs to the OFF-state.
Electro-Sensitive Protective Equipment (ESPE):
An assembly of devices and/or components working
together for protective tripping or presence sensing purposes and comprising as a minimum:
•
a sensing device
•
controlling/monitoring devices
•
output signal switching devices
LOCKOUT Condition:
When the ESPE detects a fault, it transitions to this state. The OSSD will be held
to the OFF state and the ESPE will not attempt to leave this state without performing a comprehensive
power-up self-test. A power-up self-test will be initiated by either cycling the ESPE power or by a Start
signal transition.
MACHINE RUN:
When the ESPE is in this state the two OSSD are both active. In this state the Green
MACHINE RUN LED is on, the Red MACHINE STOP LED is off and the Yellow INTERLOCK LED
is off.
MACHINE STOP:
When the ESPE is in this state the two OSSD are both inactive. In this state the Green
MACHINE RUN LED is off, the Red MACHINE STOP LED is on.
OFF-State:
The state in which the output circuit is interrupted and does not permit the flow of current.
ON-State:
The state in which the output circuit is completed and permits the flow of current.
Output Signal Switching Device (OSSD):
The safety output of the ESPE that is used to enable and
disable the guarded machine.
Response Time:
The maximum amount of time required for the ESPE to set its OSSD outputs to the
OFF-state once the detection zone is blocked by an opaque object of the specified size.
Start INTERLOCK:
Upon completion of power-up, the ESPE must go to the “INTERLOCK” state. A
Start signal transition must occur before going to MACHINE RUN for the first time. Once the first
Start condition has been met, the ESPE will operate in the Automatic Start mode.
Start/Restart INTERLOCK:
The ESPE will go into the INTERLOCK state upon completion of power-up
and during zone violations which causes a transition to the MACHINE STOP state. A Start signal
transition must occur before returning to MACHINE RUN following any transition to MACHINE
STOP.
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