Datasheet

17
PICPLC16 v6 Development System
PICPLC16 v6 Development System
MikroElektronika
page
12.0. Relays and Optocouplers
12.0. Relays and Optocouplers
Industrial devices usually utilize more power than the microcontroller can provide via its I/O ports. To enable the microcontroller to be
connected to such devices, the development system is provided with 16 relays by means of which it is possible to provide up to 250V
power supply. Each relay has one normally-open (W0, W1...) and one normally-closed (NW0, NW1...) contact. Sixteen relays are
divided in four groups each consisting of four relays. Relays of one group are connected to one common contact. Accordingly, there
are COMA, COMB, COMC and COMD common contacts. Figure 12-3 illustrates the connection between one group of relays and the
relevant COMA common contact. In addition to relays, the development system also features optocouplers the function of which is to
galvanically isolate signals brought to the microcontroller inputs from industrial devices. As can be seen in Figure 12-3, optocouplers
are also linked to one common connector OCVCC.
Figure 12-3: Relays and optocouplers and microcontroller connection schematic
Optocouplers galvanically isolate microcontroller inputs from high voltage
Figure 12-1: Relays with relevant connectors
Figure 12-2: Optocouplers with relevant connectors