Activate a frame on an IO module

[power4]

Hi Everyone, I am using a IOX-024-020 module connecting to a MC024-021 microcontroller. The IO module default send out frames via CAN. The frame has CMD33, 65, 66, 67, 68, 97, 98, and 99. But The IO module has Digital Input pin. But there is no CAN message about Digital input value and status. The Digital Input message is CMD16, which has to be activated. Can anyone tell me how to activate the CMD16 frame on the IO module.
Thanks a lot.

[power4]

If I changed the AddrMode to 1, the controller can get the real-time value of the IO input pins. However, if the AddrMode is set to 2, which is fixed ID, then the analog input pin on IO_BUS is not the same as the pin on the IO module. So, what the controller needs to do in order to have the pin volt value on the IO_BUS?