4
OMRON SCIENTIFIC TECHNOLOGIES INC.
Fremont CA USA
Tel: 1/888/510-4357 in USA and Canada
© OSTI 1209 PN99584-0050 Rev. E
Original Instructions
16
4 S
YSTEM
O
PERATION
4
The 4700 system is a microprocessor-controlled, infrared transmitted-beam safety light curtain. The
system consists of a receiver assembly and a transmitter assembly. Quick disconnect cables link the
controller to the transmitter and receiver.
The safety light curtain is often used where personnel protection is required. Typical applications
include mechanical power presses, robotic work cells, filter presses, injection molders, food
processing equipment and automated assembly equipment.
4.1 O
PERATING
S
TATES
The operating condition of a 4700 system is described in terms of states. The following operating
states exist for the 4700 system.
4.1.1
M
ACHINE
R
UN
The two system safety outputs are in the ON state, the green machine run indicator is lit, and the
auxiliary output is in a state consistent with its configuration. See
on page 27. The protected
machine is allowed to operate. Pressing and releasing the start button has no effect.
4.1.2
M
ACHINE
S
TOP
☛ ☛
The two system safety outputs are in the OFF state, the red machine stop indicator is lit, and the
auxiliary output is in a state consistent with its configuration. See section
protected machine is not allowed to operate. Press and releasing the start switch has no effect.
4.1.3
I
NTERLOCK
The two system safety outputs are in the OFF state, the red machine stop indicator and yellow
interlock indicator are lit. The auxiliary output is in a state consistent with its configuration. See
on page 27. The interlock state does not allow the protected machine to operate until the
detection zone is clear of obstructions and the start button is pressed and released.
4.1.4
A
LARM
The two system safety outputs are in the OFF state, the red machine stop indicator is lit, the yellow
interlock indicator is flashing, and the auxiliary output is in the OFF state. The alarm state does not
allow the protected machine to operate. The primary difference between alarm and interlock is that the
4700 system will remain in the alarm state until power is recycled or the start switch is pressed and
released and the system has run a self-test.
4.2 O
PERATING
M
ODES
System operating modes determine the start-up and operating behavior of the 4700 system. Operating
mode definitions rely on the operating states presented above. Operating mode selection is performed
via configuration switches under the front cover of the controller.
NOTE!
If internal faults are detected by the 4700 system during power-up or operation, it will enter
the alarm state with its safety outputs in the OFF state.
4.2.1
A
UTOMATIC
S
TART
The 4700 system will power-up with its safety outputs OFF, and perform system initialization and self
tests. The 4700 system will enter the machine run state if no obstructions are present in the detection
zone. In this state, when an object is sensed entering the detection zone, the 4700 system will change
