94 Rockwell Automation Publication 2080-UM002N-EN-E - November 2022
Chapter 6          Micro870 Controller Distributed Network Protocol
START_APPL (FC Byte = 0x11) 
17 – Start Application
This function code is used to start the user program which was downloaded by Connected 
Components Workbench software.
STOP_APPL (FC Byte = 0x12) 
18 Stop Application
This function code is used to stop the user program which was downloaded by Connected 
Components Workbench software.
ENABLE_UNSOLICITED (FC Byte = 0x14) 
20 – Enable Unsolicited Message
This function is used to dynamically enable unsolicited messages generated in the controller.
DISABLE_UNSOLICITED (FC Byte = 0x15) 
21 – Disable Unsolicited Message
This function is used to dynamically disable unsolicited messages generated in the controller.
DELAY_MEASURE (FC Byte = 0x17) 
23 – Delay Measurement, used for Non-LAN Procedure
This function code is used to measure the communication channel delay time.
RECORD_CURRENT_TIME (FC Byte = 0x18) 
24 – Record Current Time, used for LAN Procedure
This function code is used in the procedure for time synchronizing controllers that 
communicate over a LAN. 
OPEN_FILE (FC Byte = 0x19) 
25 – Open File
This function code is used to make a file available for reading or writing.
CLOSE_FILE (FC Byte = 0x1A) 
26 – Close File
After the file reading or writing operation, this function code used to unlock the file.
DELETE_FILE (FC Byte = 0x1B) 
27 – Delete File
A DNP3 master uses this function code to delete a file.
GET_FILE_INFO (FC Byte = 0x1C) 
28 – Get File Information
This function code is for the master to retrieve information about a file in the controller. 
AUTHENTICATE_FILE (FC Byte = 0x1D) 
29 – Authenticate File
This function code is used to obtain an authentication key that is needed to open or delete a 
file.