How to Calculate I/O Points of User I/O

The following formula shows the maximum number of user input/output points by setting the maximum input/output size.

Formula

Maximum Number of User Input Points

Standard allocation: Input size [byte] × 8 - 40

RC3 compatible allocation: Input size [byte] × 8 - 24

Maximum Number of User Output Points

Standard allocation: Output size [byte] × 8 - 32

RC3 compatible allocation: Output size [byte] × 8 - 32

Calculation Example

For example, if both the maximum input size and the maximum output size are set to "33" [byte], the maximum user input/output points will be the following.

• Standard allocation:
  Maximum number of user input points : 33 × 8 - 40 = 224
  Maximum number of user output points : 33 × 8 - 32 = 232
• RC3 compatible allocation:
  Maximum number of user input points : 33 × 8 - 24 = 240
  Maximum number of user output points : 33 × 8 - 32 = 232