Rockwell Automation Publication 1766-UM001O-EN-P - September 2021 271
Appendix F MicroLogix 1400 Distributed Network Protocol
Function Codes These tables show the Application Layer Function codes implemented in the
controller.
35 85 135 Wait for Reply Event Counter for Max Invalid Replies Or Comm Failure Detected
36 86 136 Wait for Reply Event Counter for Max Invalid Replies Or Comm Failure Detected
37 87 137 Wait for Reply Event Counter for Rx Error Message
38 88 138 Wait for Reply Event Counter for Key Change Timeout
39 89 139 Wait for Reply Event Counter for Expected Key Change Timeout
40 90 140 Wait for Reply Event Counter for Expected Key Change Timeout
41 91 141 Wait for Reply Event Counter for Rx Key Status Request
42 92 142 Wait for Reply Event Counter for Rx Valid Aggressive Mode Request
43 93 143 Wait for Reply Event Counter for Rx Valid Aggressive Mode Request
44 94 144 Wait for Reply Event Counter for Rx Invalid Aggressive Mode Request
45 95 145 Wait for Reply Event Counter for Rx Valid Key Change
46 96 146 Wait for Reply Event Counter for Rx Invalid Key Change
47 97 147 Wait for Reply Event Counter for Rx Challenge
48 98 148 Wait for Reply Reserved
49 99 149 Wait for Reply Counter for Ignored events
Table 34 - Secure Authentication Diagnostics (Continued)
Word Offset
Current State Description
CH0 CH1 CH2
Table 35 - Function Codes for MicroLogix 1400 Series A Controllers
Message Type Function Code Name MicroLogix 1400 Support Description
Confirmation 0 (0x00) FC_CONFIRM Yes Controller parses/sends
Request 1 (0x01) FC_READ Yes Controller parses
Request 2 (0x02) FC_WRITE Yes Controller parses
Request 3 (0x03) FC_SELECT Yes Controller parses
Request 4 (0x04) FC_OPERATE Yes Controller parses
Request 5 (0x05) FC_DIRECT_OPERATE Yes Controller parses
Request 6 (0x06) FC_DIRECT_OPERATE_NR Yes Controller parses
Request 7 (0x07) FC_IMMED_FREEZE Yes Controller parses
Request 8 (0x08) FC_IMMED_FREEZE_NR Yes Controller parses
Request 9 (0x09) FC_FREEZE_CLEAR Yes Controller parses
Request 10 (0x0A) FC_FREEZE_CLEAR_NR Yes Controller parses
Request 11 (0x0B) FC_FREEZE_AT_TIME No
Request 12 (0x0C) FC_FREEZE_AT_TIME_NR No
Request 13 (0x0D) FC_COLD_RESTART Yes
Controller parses. Controller should not be in the executing mode and
any program and files should not be in open state.
Request 14 (0x0E) FC_WARM_RESTART No
Request 15 (0x0F) FC_INITIALIZE_DATA No Obsolete
Request 16 (0x10) FC_INITIALIZE_APPL Yes
Controller parses. Clears fault and changes the controller mode to
Remote Program. See Start and Stop User Programs (Mode Change)
via DNP3 Network on page 260.
Request 17 (0x11) FC_START_APPL Yes
Controller parses. Clears fault and changes the controller mode to
Remote Run. See Start and Stop User Programs (Mode Change) via
DNP3 Network on page 260.
Request 18 (0x12) FC_STOP_APPL Yes
Controller parses. Changes the controller mode to Remote Program.
See Start and Stop User Programs (Mode Change) via DNP3 Network
on page 260.
Request 19 (0x13) FC_SAVE_CONFIG No Deprecated.
Request 20 (0x14) FC_ENABLE_UNSOLICITED Yes Controller parses
Request 21 (0x15) FC_DISABLE_UNSOLICITED Yes Controller parses
Request 22 (0x16) FC_ASSIGN_CLASS No
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