GE Multilin 745 Communications Manual page 77

CHAPTER 2: MODBUS PROTOCOL
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
F18: Maximum demand phase (16-bit enumeration)
Value Maximum demand
0 in phase A
1 in phase B
2 in phase C
F19: Command operation code (16-bit enumeration)
Value Command
0 No operation
1 Remote reset
2 Trigger trace memory
3 Clear maximum demand data
F20: Relay status (16-bit bitmask)
Bitmask Description
–––– –––– –––– –––1 Relay in service
–––– –––– –––– ––1– One or more self-test errors
–––– –––– –––– –1–– Test mode enabled
–––– –––– –––– 1––– Differential blocked
–––– –––– –––1 –––– Not used
–––– –––– ––1– –––– Not used
–––– –––– –1–– –––– Local mode on
–––– –––– 1––– –––– One or more active diagnostic messages
F21: System status (16-bit bitmask)
Bitmask Description
–––– –––– –––– –––1 Transformer de-energized
–––– –––– –––– ––1– Transformer overload
–––– –––– –––– –1–– Load limit reduced
–––– –––– –––– 1––– Not used
–––– –––– –––1 –––– Setpoint group 1 active
–––– –––– ––1– –––– Setpoint group 2 active
–––– –––– –1–– –––– Setpoint group 3 active
–––– –––– 1––– –––– Setpoint group 4 active
F22: Time (32 bits)
First block of eight bits (0000 0000 ---- ---- ---- ---- ----- ----): hours, 0 to 23 in steps of 1
Second block of eight bits (---- ---- 0000 0000 ---- ---- ---- ----): minutes, 0 to 59 in steps of
1
Third and fourth block of four bits (---- ---- ---- ---- 0000 0000 0000 0000): seconds in
format SS.SSSS (0 to 59999 in steps of 1). For example, 2.220 seconds stored as 2220.
Note: if the time has never been set, then all bits will be set to 1.
F23: Date (32 bits)
First block of eight bits (0000 0000 ---- ---- ---- ---- ----- ----): month, 0 to 12 in steps of 1
Second block of eight bits (---- ---- 0000 0000 ---- ---- ---- ----): day, 0 to 31 in steps of 1
Third and fourth block of four bits (---- ---- ---- ---- 0000 0000 0000 0000): year, 1990 to
2089 in steps of 1.
Note: if the date has never been set, then all bits will be set to 1.
Value Command
4 Clear event recorder
5 Not used
6 Clear trace memory
7 Clear energy data
MODBUS PROTOCOL
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