440L-M8200 Datasheet, PDF (1/1 Pages) Allen-Bradley – Safety Light Curtain Interfaces

+24V DC
Reset
Momentary
Push Button
Safeguarding Applications
Light Curtains
POC, 440L-M8200, Bulletin 100S, Dual Channel
K2
K1
A1 A2 PE T0 PE T13 T14 X11 X12 T21 T22 X21 X22 1.3 2.3 3.1
440L-M8200
C1 D1 PE C2 D2 PE T3 T4 C3 D3 PE C4 D4 1.4 2.4 3.2
K1
Inputs
K2
PLC Logic
Common
Outputs
0 1 2 3 4 ... N
1 27
127
4
4
OSSD 1
3
Test
3 _{OSSD 2}
Sender
Receiver
POC Light Curtain
Ground
K1
Bulletin 100S
K2
or 700S
O1
O2
O3
Circuit Status
The light curtain is not detecting the presence of any objects. The power to the PLC Output common terminal is OFF. The Reset switch on the
440L-8200 must be pressed to apply power to the PLC Output Module.
Operating Principle
The momentary reset button must be pressed to apply power to the PLC output module.
The PLC controls the operation of the machine.
When an object breaks the beam of the light curtain, the outputs from the light curtain receiver turn off. The 440L-M8200 detects the absence
of the input signals at T3 and T4 and causes the K1 and K2 Bulletin 100 contactors (or Bulletin 700S relays) to drop out.
This disconnects power to the output module of the PLC.
Fault Detection
If either contactor K1 or K2 sticks ON, the PLC output module will be disconnected by the other contactor operating properly.
The 440L-M8200 relay will detect the stuck contactor because terminals T21 and T22 will be open.
The fault must be corrected and the 440L-M8200 reset in order to apply power to the PLC output module.
Comments
The contactors should be selected to meet the load requirements of the PLC output loads.
The N.C. auxiliary contact is fed into the PLC input, so the PLC knows when the light curtain has been activated.
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