PEPPERL+FUCHS SLVA-4Kplus Safety Light Curtain Controller

Product positioning and safety level

Product: Beijiafu SLVA-4Kplus Safety Light Curtain Controller

Purpose: Drive 1-4 SLA safety light curtains/SLP safety gratings to achieve hazardous area protection

Security certification:

Type 4（EN 61496-1）

Cat.4 / PL e（ISO 13849-1）

SIL 3（IEC 61508）

Protection: Controller IP20, cabinet installation requires ≥ IP54 shell

Core specification parameters

Project parameters

Number of channels: 4 light curtains/gratings

Response time 40ms

Power supply 24V DC/115V AC/230V AC

Safe output OSSD 19-22, 2A, relay passive

Relay monitoring 24V DC, 10mA, 200ms response

Emergency stop type static/pulse (dual channel)

Light curtain cable with a maximum length of 50m

Working temperature 0-50 ℃

Weight 900g

Terminal Definition (Core)

Terminal function

1-2 testing/fault reset (normally closed)

3-4 Start/Restart Enable

5-6 OSSD status indicator light

7-14 Light Curtain Receiver Signal

15-16 Start ready indicator light

17-18 power input

19-22 OSSD safety relay output

23-24 External Relay Monitoring (EDM)

25-32 light curtain transmitter power supply

Working mode (DIP switch configuration)

Set functions through 4 sets of DIP switches:

Switch 1: ON=Enable start/restart interlock

Switch 2: ON=Enable Relay Monitoring (EDM)

Switch 3: ON=Channel 3/4 for emergency stop

Switch 4: ON=pulse emergency stop; OFF=Static Emergency Stop

Key functions

Start/restart interlock (AWS)

Restoration after shading, manual reset is required to restart

Reset signal valid: 0.05-1s

Relay Monitoring (RM/EDM)

Monitor the normally closed point of the external contactor

If there is no feedback within 200ms, fault F will be reported

Dual channel emergency stop

Static: 24V DC, requires independent cable

Pulse: Internal self check, no need for protective wiring

Test function

Trigger TEST to perform a full system self-test and force the safety output to disconnect

status indicator

7-segment digital display: running/fault codes

LED: Channel Status, OSSD Status

Installation and wiring

Installation: DIN rail 35mm installation

Light curtain wiring:

Transmitter: 25-32 corresponds to channels 1-4

Receiver: 7-14 corresponds to channels 1-4

Idle channels need to be bridged

Safe distance: calculated according to ISO 13855: S=K × T+C

Beam height: 2 beams → 400/900mm; 3 beams → 300/700/1100mm; 4 beams → 300/600/900/1200mm

Debugging and verification

Optical path calibration: Align the red light and keep the indicator light on at the receiving end

Functional check:

Light blocking → OSSD disconnection

Restart interlock → reset takes effect

Emergency stop → immediately disconnect

Relay monitoring → wire breakage fault report

Regular inspection: Daily shading test, regular inspection of emergency stop and interlock

Fault handling

No display: Check power supply

Fault F: Abnormal relay monitoring

Fault 0: Optical path obstruction

Fault E: Short circuit/interference of transmitter

Solution: TEST reset or power off restart, still abnormal and needs to be repaired

Key issues

Question 1: What is the OSSD output of SLVA-4Kplus? What is its function?

Answer: OSSD (Output Signal Switching Device) is a dual channel safety relay output with 19-22 terminals of the controller. It is a passive normally open contact rated at 2A. Its function is to immediately disconnect and cut off the power circuit of the equipment when the light curtain is blocked, emergency stop is pressed, or there is a fault, achieving the highest level of safety shutdown.

Question 2: How does the Relay Monitoring (EDM) function work? What will happen if I make a mistake?

Answer: The relay monitoring monitors the normally closed contacts of the external contactor through terminals 23-24. If the controller does not detect any changes in the contact status within 200ms after switching to OSSD, the fault is determined and the machine is locked. Incorrect connection, disconnection, or contact adhesion can trigger fault F, causing the safety output to remain disconnected and the device to fail to start.

Question 3: What is the difference between static and pulse modes for dual channel emergency stop? How to choose?

answer:

Static emergency stop: Input 24V DC, no cross check, cables must be separated or mechanically protected.

Pulse emergency stop: Internal pulse self check, no need for cable protection, suitable for long-distance wiring.

Selection: Pulse mode for normal environment (DIP4=ON); When there is high interference, long-distance, and no protective casing, static mode must be used and wired separately.