Maximum number of relays

[stAch]

max 10

1 lk board out1+ 1 LK out5 in board 

4 external OUT 1-4 releys on IDC10-2

4 external PWM 0-3 releys on IDC10-1

out 5 simple connect 2 wire for out5 and gnd and connect to the relay coil based by power you used
for pwm use releys as out or use boards https://www.ledats.pl/en/kontrolazasilan...ay-tr.html


if you use multiplexer CD74HC4067 [DIY] 4 uotputs control 16channel --> based by arduino  ==> max 34 releys or 96 bistable