2–34
745 TRANSFORMER PROTECTION SYSTEM – COMMUNICATIONS GUIDE
MODBUS PROTOCOL
CHAPTER 2: MODBUS PROTOCOL
0857
Event XX winding 3 ground current magnitude
---
---
A
F83
0 A
0858
Event XX winding 3 ground current angle
0 to 359
1
° Lag
F1
0° Lag
0859
Event XX winding 3 phase A 2nd harmonic
0.0 to 99.9
0.1
% ƒo
F2
0% ƒo
085A
Event XX winding 3 phase B 2nd harmonic
0.0 to 99.9
0.1
% ƒo
F2
0% ƒo
085B
Event XX winding 3 phase C 2nd harmonic
0.0 to 99.9
0.1
% ƒo
F2
0% ƒo
085C
Event XX winding 3 phase A 5th harmonic
0.0 to 99.9
0.1
% ƒo
F2
0% ƒo
085D
Event XX winding 3 phase B 5th harmonic
0.0 to 99.9
0.1
% ƒo
F2
0% ƒo
085E
Event XX winding 3 phase C 5th harmonic
0.0 to 99.9
0.1
% ƒo
F2
0% ƒo
085F
Event XX phase A differential current
0.00 to 655.35
0.01
×
CT
F3
0.00
×
CT
0860
Event XX phase B differential current
0.00 to 655.35
0.01
×
CT
F3
0.00
×
CT
0861
Event XX phase C differential current
0.00 to 655.35
0.01
×
CT
F3
0.00
×
CT
0862
Event XX phase A restraint current
0.00 to 655.35
0.01
×
CT
F3
0.00
×
CT
0863
Event XX phase B restraint current
0.00 to 655.35
0.01
×
CT
F3
0.00
×
CT
0864
Event XX phase C restraint current
0.00 to 655.35
0.01
×
CT
F3
0.00
×
CT
0865
Event XX system frequency
0.00 to 99.99
0.01
Hz
F3
0.00 Hz
0866
Event XX frequency decay rate
–9.99 to 9.99
0.01
Hz/s
F6
0.00 Hz/s
0867
Event XX tap changer position
1 to 50
1
---
F1
0 = n/a
0868
Event XX volts-per-hertz
0.00 to 4.00
0.01
V/Hz
F3
0.00 V/Hz
0869
Event XX ambient temperature
–51 to 251
1
°C
F4
0 °C
086A
Event XX analog input
0 to 65000
1
<Units>
F1
0 <Units>
086B
Reserved
086C
Reserved
↓
↓
↓
↓
↓
↓
↓
086F
Reserved
Communications actual values
0870
CoBox serial number
---
---
---
F22
Unknown
0884
MAC address
---
---
---
F22
Unknown
0898
CoBox firmware version
---
---
---
F22
Unknown
08AC
Ethernet status
---
---
---
F152
---
08AD Reserved
08AE
Reserved
↓
↓
↓
↓
↓
↓
↓
0FFF
Reserved
Common setpoints (addresses 1000 to 1FFF, read/write)
745 setup
1000
745 setpoints
---
---
---
F29
0 = Not Prog’d
1001
Encrypted passcode (4 registers, read only)
Note: From version 5.23 onward, relay
response to read request is 00000000.
---
---
---
F33
00000000
1005
Reserved
1006
Flash message time
0.5 to 10.0
0.5
s
F2
40 = 4.0 s
1007
Default message timeout
10 to 900
1
s
F1
300 s
1008
Reserved
1009
Slave address
1 to 254
1
---
F1
254
100A
COM1 baud rate
---
---
---
F31
5 = 19200 Bd
100B
COM1 parity
---
---
---
F73
0 = None
100C
COM1 communication hardware
---
---
---
F17
0 = RS485
100D
COM2 baud rate
---
---
---
F31
5 = 19200 Bd
Table 2–4: 745 memory map (Sheet 22 of 56)
Addr
Description
Range
Step
Units
Format
Default