2–86
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
MODBUS PROTOCOL
CHAPTER 2: MODBUS PROTOCOL
F56: Input assert flags (16-bit bitmask)
F57: Output relay operate flags (16-bit bitmask)
F58: Demand meter type (16-bit enumeration)
F59: Virtual output operate flags (16-bit bitmask)
Bitmask
Input flag
–––– –––– –––– –––x
Input 1 (0 = not asserted, 1 = asserted)
–––– –––– –––– ––x–
Input 2 (0 = not asserted, 1 = asserted)
–––– –––– –––– –x––
Input 3 (0 = not asserted, 1 = asserted)
–––– –––– –––– x–––
Input 4 (0 = not asserted, 1 = asserted)
–––– –––– –––x ––––
Input 5 (0 = not asserted, 1 = asserted)
–––– –––– ––x– ––––
Input 6 (0 = not asserted, 1 = asserted)
–––– –––– –x–– ––––
Input 7 (0 = not asserted, 1 = asserted)
–––– –––– x––– ––––
Input 8 (0 = not asserted, 1 = asserted)
–––– –––x –––– ––––
Input 9 (0 = not asserted, 1 = asserted)
–––– ––x– –––– ––––
Input 10 (0 = not asserted, 1 = asserted)
–––– –x–– –––– ––––
Input 11 (0 = not asserted, 1 = asserted)
–––– x––– –––– ––––
Input 12 (0 = not asserted, 1 = asserted)
–––x –––– –––– ––––
Input 13 (0 = not asserted, 1 = asserted)
––x– –––– –––– ––––
Input 14 (0 = not asserted, 1 = asserted)
–x–– –––– –––– ––––
Input 15 (0 = not asserted, 1 = asserted)
x––– –––– –––– ––––
Input 16 (0 = not asserted, 1 = asserted)
Bitmask
Output state
–––– –––– –––– –––x
Output relay 1 (0 = not operated, 1 = operated)
–––– –––– –––– ––x–
Output relay 2 (0 = not operated, 1 = operated)
–––– –––– –––– –x––
Output relay 3 (0 = not operated, 1 = operated)
–––– –––– –––– x–––
Output relay 4 (0 = not operated, 1 = operated)
–––– –––– –––x ––––
Output relay 5 (0 = not operated, 1 = operated)
–––– –––– ––x– ––––
Output relay 6 (0 = not operated, 1 = operated)
–––– –––– –x–– ––––
Output relay 7 (0 = not operated, 1 = operated)
–––– –––– x––– ––––
Output relay 8 (0 = not operated, 1 = operated)
–––– –––x –––– ––––
Self-test relay (0 = not operated, 1 = operated)
Value
Demand
0
Thermal
1
Block interval
2
Rolling demand
Bitmask
Output state
–––– –––– –––– –––x
Virtual output 1 (0 = not operated, 1 = operated)
–––– –––– –––– ––x–
Virtual output 2 (0 = not operated, 1 = operated)
–––– –––– –––– –x––
Virtual output 3 (0 = not operated, 1 = operated)
–––– –––– –––– x–––
Virtual output 4 (0 = not operated, 1 = operated)
–––– –––– –––x ––––
Virtual output 5 (0 = not operated, 1 = operated)