Troubleshooting of Leuze electronic DDLS 200 optical transmission

Not following the above distance will lead to mutual interference between adjacent systems, manifested as an increase in bit error rate and unstable communication.

2.3 Quick Alignment Techniques

During the installation phase, it is recommended to first use rough visual alignment, and then power on for electronic fine alignment (see Chapter 4 for details).

Electrical connections: power supply, input/output, and INTERBUS wiring

3.1 Power Supply and Grounding

The power terminals Vin (+18... 30 V DC) and GND (0 V) use spring terminals at the bottom of the housing and provide dual terminals for cascading power supply.

It is necessary to connect the protective earth (PE), which can be done through dedicated PE terminals or shell grounding screws (maximum wire diameter 2.5 mm ²).

The power supply must use a double insulated safety transformer that complies with EN 60742.

Common error: Incorrect grounding can cause EMC interference, causing the received signal bar to bounce.

3.2 Switching input IN (transmit/receive off)

The IN terminal is used for remote shutdown of laser emission and bus drive. The logic is as follows:

0... 2 V DC: transmit/receive off, no infrared light output, bus output in high impedance state.

18... 30 V DC: normal transmission/reception.

Switch S1 is used to bypass this input:

S1=On: Ignoring the IN terminal, the transmission/reception always works (internally pulled up to Vin).

S1=Off: Controlled by the IN terminal voltage.

Typical application: When the stacker crane is changing lanes, the current optical path is temporarily turned off through PLC to avoid interference with adjacent lanes.

3.3 Switching output OUT Warning

When the received level drops to the warning threshold, the OUT Warning output becomes Vin-2 V (high level), which is 0... 2 V during normal operation. This output can be connected to the PLC input for remote monitoring of optical path contamination or alignment offset. The output has short-circuit protection, overvoltage protection, and overheating protection.

3.4 INTERBUS interface wiring (for INTERBUS models)

The INTERBUS version of DDLS 200 provides the following terminals:

Rx+/Rx -: receive line (from bus)

Tx+/Tx -: Transmission line (to bus)

COM: equipotential connection

Switch S4 is used to set the shielding connection method:

S4=In: Used for input bus, shield connected to PE through RC circuit (1 M Ω+15 nF).

S4=Out: Used for output bus, shielding direct connection to PE.

Important: The bus cable type, length, and shielding requirements in the INTERBUS standard EN 50254 must be followed.

Operation mode and fine tuning: using bar graphs to achieve optimal alignment

The DDLS 200 offers three operating modes, which can be switched through buttons and LEDs on the panel. Correctly understanding and using these patterns is the core of ensuring communication quality.

4.1 Definition of Three Modes

Meaning of Mode LED Light Transmission Status Bar Diagram Application Scenarios

Automatic (AUT) AUT lights up and activates to display the local receiving level (transmitted by the other party) and operates normally

Manual (MAN) MAN is activated to display the local receiving level, but the internal shutdown threshold is raised to the warning level to maintain communication during the adjustment process, but the performance margin is low

Adjust (ADJ) ADJ light interrupt to display the receiving level of the other party (i.e. the strength of the local transmission received by the other party). Align independently by one person

Switching rules:

From AUT to MAN: Press and hold the button (>2 seconds) to switch only the device being pressed.

From MAN to ADJ: Short press the button to require both devices to be in MAN mode, and press it to enter ADJ simultaneously.

From ADJ to MAN: Short press any device button and both devices will return to MAN simultaneously.

From MAN to AUT: Press and hold the button (>2 seconds) to switch only the device being pressed.

4.2 Fine alignment steps (single person operation)

The manual provides the following standard procedures:

Install the two devices in place and power on, confirm that the PWR/UL LED is always on. The initial distance is greater than 1 meter.

Press and hold any device button (>2 seconds) to switch it to MAN mode (MAN LED on). At this time, data communication is still maintained, but the performance margin is reduced.

Adjust the device to make the bar graph display as full as possible (10 LEDs are fully lit). If the bar chart is not satisfactory, it indicates poor alignment.

Intentionally moving the device until data communication is interrupted (only the first few LEDs in the bar are lit). This step is to find the critical point.

Short press the button to switch both devices to ADJ mode simultaneously (ADJ LED on). At this time, data communication is interrupted.

In ADJ mode, the bar graph displays the strength of the local transmission signal received by the other party. Adjust the azimuth and elevation angles of the device to maximize the bar chart (ideally fully offset). If there is only one person, they can walk to the opposite device and repeat the same operation, but usually the ADJ mode allows one person to adjust each device one by one.