The following table shows I/O read/write actions of an HTB.
| Object (Hex) | Sub index | Bit | Description | Parameter | 
| 6000 | 1 | 0 ... 7 | Input 0 ... Input 7 | 8 bit word | 
| 2 | 0 ... 3 | Input 8 ... Input 11 | 8 bit word | |
| 4 to 7 | Disable | |||
| 6100 | 1 | 0 ... 11 | Input 0 ... Input 11 | 16 bit word | 
| 12 to 15 | Disable | |||
| 6200 | 1 | 0 ... 7 | Output 0 ... Output 7 | 8 bit word | 
| 6300 | 1 | 0 ... 7 | Output 0 ... Output 7 | 16 bit word | 
| 8 to 15 | Disable |