EL6821 – connection

EL6821 – connection 1:Fig.4: EL6821

Terminal point

No.

Connection for

+24 V

1

Power supply connection +24 V

Input 1

2

Digital input 1

DA +

3

DALI-2 bus + (internally connected to terminal point 7)

DA -

4

DALI-2 bus - (internally connected to terminal point 8)

0 V

5

Power supply connection 0 V

Input 2

6

Digital input 2

DA +

7

DALI-2 bus + (internally connected to terminal point 3)

DA -

8

DALI-2 bus - (internally connected to terminal point 4)

Connection instructions

Notice Digital inputs "Input 1" (terminal point 2) and "Input 2" (terminal point 6)

  • The digital inputs only work if the supply voltage (24 V) is applied and the E-bus is supplied with voltage. The potential for the 24 V inputs is the potential of the electrically isolated input voltage.
  • Depending on the settings via the "FB_EL6821Communication" function block, other PLC-controlled DALI commands are blocked by activating the digital inputs (see Priority of the digital inputs).

Notice Topology, cable length and cable cross-section in DALI operation

  • The DALI bus can be configured in a line or star topology, or in a mix of the two.
  • The maximum cable length must not exceed 300 m!
  • The cable cross-section depends on the cable length:
    • for cable lengths up to 100 m: ≥ 0.5 mm2
    • for cable lengths up to 150 m: ≥ 0.75 mm2
    • for cable lengths up to 300 m: ≥ 1.5 mm2

Notice Further important boundary conditions derived from IEC 62386:

  • The electrically isolated input voltage of 24 VDC must be supplied to comply with the certification conditions
    • via the EL9562 power supply terminal (see connection examples) or
    • via the power supplies PS1111-2402-0002, PS1111-2403-0000 or PS1111-2403-0002 (see connection example).
  • The DALI cables must not be terminated with resistors.
  • The maximum voltage drop between the sender and the receiver must not exceed 2 V.
  • If the maximum cable length is utilized, it is not advisable to lay DALI in combination with the power cable.

Priority of the digital inputs

The digital Input 1 and Input 2 have priority over automatic control through the PLC program. If the digital inputs are operated, other PLC-controlled DALI commands are blocked. For release, a positive edge must be applied to the “bResetInactiveProcessImage” input of the “FB_EL6821Communication” function block (see documentation TwinCAT 3 | PLC libraries: Tc3_DALI). Alternatively, the priority rule can also be changed via the setting in TwinCAT 3 (do not lock process image).

Behavior of the digital inputs

The behavior of the digital inputs "Input 1" and "Input 2" can be changed via the library function blocks or via the settings in TwinCAT 3. To support commissioning, the following default behavior is assigned in the delivery state.

Signal

Broadcast
DALI command

Action

Comment

Rising edge at DI1

00hex

Turns OFF all control gears (without fading).

Factory setting

Rising edge at DI2

05hex

Switches all control gears to maximum brightness.
If a control gear is switched off, it is switched on.

Factory setting

Further Information