Fc_activate_config (fc byte = 0x1f), Fc_authentication_request (fc byte = 0x20), Fc_authentication_request_nr (fc byte = 0x21) – Rockwell Automation 1766-Lxxxx MicroLogix 1400 Programmable Controllers User Manual User Manual
Page 271: Fc_response (fc byte = 0x81), Fc_unsolicited_response (fc byte = 0x82), Fc_authentication_response (fc byte = 0x83)

Rockwell Automation Publication 1766-UM001H-EN-P - May 2014
231
MicroLogix 1400 Distributed Network Protocol (DNP3) Appendix F
This applies only to MicroLogix 1400 Series B controllers.
FC_ACTIVATE_CONFIG (FC Byte = 0x1F)
31 - Activate Config
This function code is used to begin using the configuration or executable code
specified by the objects included in the request.
This applies only to MicroLogix 1400 Series B controllers.
FC_AUTHENTICATION_REQUEST (FC Byte = 0x20)
32 - Authentication Request
The master uses this function code when sending authentication messages to the
MicroLogix 1400 that require a response
This applies only to MicroLogix 1400 Series B controllers.
FC_AUTHENTICATION_REQUEST_NR (FC Byte = 0x21)
33 - Authentication Request No Resp
This function code is used by the master to send authentication messages when
no return response is required.
This applies only to MicroLogix 1400 Series B controllers.
FC_RESPONSE (FC Byte = 0x81)
129 - Response
All responses except for Unsolicited Response messages use this function code.
FC_UNSOLICITED_RESPONSE (FC Byte = 0x82)
130 - Unsolicited Response
Unsolicited Responses always use this function code regardless of which DNP3
objects are included.
FC_AUTHENTICATION_RESPONSE (FC Byte = 0x83)
131 - Authentication Response
This function code is used to issue authentication messages to the master. This
applies only to MicroLogix 1400 Series B controllers.