Usable LEDs

The EJ2564 EtherCAT plug-in module outputs the LED supply voltage PWM modulated. The current is not limited by the module. When selecting the LED or the LED strip, it is therefore important to ensure that appropriate series resistors are present or that some other current limiting device is connected upstream.

The module is particularly suitable for the use of multicolor lighting. Several differently colored LED chips are installed in one housing. Standard combinations are for example red, green and blue (RGB - Red, Green, Blue). For this combination, the EJ2564 module would need three channels, one for each color. But there are also RGB LEDs with an additional chip for white, the so-called RGBW (Red, Green, Blue, White) LEDs. All four channels of the module are then needed.

Besides the colored LEDs, there are also so-called CCT (correlated color temperature) LEDs. These are also known as "dual white" or "tunable white". Both warm white and cold white LEDs are interconnected to achieve a specific color temperature by mixing the two shades of white. This function can be used, for example, to simulate the course of the light color in the interior to the sunlight. This means that two LED chips (warm white, cold white) are installed in one housing. Therefore two channels of the EJ2564 EtherCAT plug-in module are required per CCT LED or CCT LED strip.

RGB+CCT describes a combination of the described RGB and the CCT LEDs. Five LED chips are combined in one housing (red, green, blue, warm white, cold white). RGB+CCT LEDs need two EJ2564 for control, because for the five different colors also five channels are needed.

For all color combinations it must be ensured that the LED or LED strip used has a common supply connection (anode) (so-called "common anode" LEDs), as the EJ2564 module is a ground switching PWM module.

An example of an RGB strip connected to the EtherCAT plug-in module is shown in the following figure.

Further information on the LEDs can be found in chapter Basics of LED technology.