| Horizontal Symbol | Vertical Symbol | Description |
 PLCIOI1T |
 PLCIOI1TV |
IN, 1st Point, 1 Wire |
 PLCIOI2T |
 PLCIOI2TV |
IN, 1st Point, 2 Wires |
 PLCIOO1T |
 PLCIOO1TV |
OUT, 1st Point, 1 Wire |
 PLCIOO2T |
 PLCIOO2TV |
OUT, 1st Point, 2 Wires |
 PLCIOI1 |
 PLCIOI1V |
IN, 2nd+ Child, one Wire |
 PLCIOI2 |
 PLCIOI2V |
IN, 2nd+ Child, 2 Wires |
 PLCIOO1 |
 PLCIOO1V |
OUT, 2nd+ Child, 1 Wire |
 PLCIOO2 |
 PLCIOO2V |
OUT, 2nd+ Child, 2 Wires |