Step 1: Make your common connections

The common connections required for LEDs on the Output Module differ slightly from those required for the commoning of switches on an Input Module. Instead of commoning upto 128 LEDs in one go, you must common up your LEDs in groups of 8 at a time.

This tutorial assumes you are wiring to the recommended common-anode polarity.

To form your commoned group of 8 LEDs, connect the positive legs of your 8 LEDs to each other using lengths of wire.

Step 3: Connect the negative LED legs

Now connect each individual leg of the group of 8 LEDs to the bottom pin marked "1" of each of the AxC1 to AxC8 blocks, one leg per block.

This means that the first LED negative leg connects to the bottom pin marked "1" of the AxC1 block, the second LED negative leg connects to the bottom pin marked "1" of the AxC2 block ... etc ... and the 8th LED negative leg connects to the bottom pin marked "1" of the AxC8 block.

Please refer to the Step 4 reference table below for a full connection list.

Step 4: Quick reference table

 

Group	LED numbers	Common +ve connection	Individual -ve connections
1	1 2 3 4 5 6 7 8	A1C1 top pin	A1C1 bottom pin A1C2 bottom pin A1C3 bottom pin A1C4 bottom pin A1C5 bottom pin A1C6 bottom pin A1C7 bottom pin A1C8 bottom pin
2	9 10 11 12 13 14 15 16	A2C1 top pin	A2C1 bottom pin A2C2 bottom pin A2C3 bottom pin A2C4 bottom pin A2C5 bottom pin A2C6 bottom pin A2C7 bottom pin A2C8 bottom pin
3	17 18 19 20 21 22 23 24	A3C1 top pin	A3C1 bottom pin A3C2 bottom pin A3C3 bottom pin A3C4 bottom pin A3C5 bottom pin A3C6 bottom pin A3C7 bottom pin A3C8 bottom pin
4	25 26 27 28 29 30 31 32	A4C1 top pin	A4C1 bottom pin A4C2 bottom pin A4C3 bottom pin A4C4 bottom pin A4C5 bottom pin A4C6 bottom pin A4C7 bottom pin A4C8 bottom pin
5	33 34 35 36 37 38 39 40	A5C1 top pin	A5C1 bottom pin A5C2 bottom pin A5C3 bottom pin A5C4 bottom pin A5C5 bottom pin A5C6 bottom pin A5C7 bottom pin A5C8 bottom pin
6	41 42 43 44 45 46 47 48	A6C1 top pin	A6C1 bottom pin A6C2 bottom pin A6C3 bottom pin A6C4 bottom pin A6C5 bottom pin A6C6 bottom pin A6C7 bottom pin A6C8 bottom pin
7	49 50 51 52 53 54 55 56	A7C1 top pin	A7C1 bottom pin A7C2 bottom pin A7C3 bottom pin A7C4 bottom pin A7C5 bottom pin A7C6 bottom pin A7C7 bottom pin A7C8 bottom pin
8	57 58 59 60 61 62 63 64	A8C1 top pin	A8C1 bottom pin A8C2 bottom pin A8C3 bottom pin A8C4 bottom pin A8C5 bottom pin A8C6 bottom pin A8C7 bottom pin A8C8 bottom pin

LEDs 65 to 128 are connected in the same manner but using the BxD1 to BxD8 pin blocks instead.

Step 5: Further connections...

Using the above steps 1 to 4, you can connect 8 groups of 8 commoned LEDs each (64 LEDs in total).

If your Output Module is capable of driving more than 64 LEDs, you can use the same procedure to group the next 8 groups of 8 LEDs each but instead making connections to the pin banks marked "BxD1" to "BxD8".