701 Motor Protection Relay
Date Code 20010719
Modbus
®
RTU Communications Protocol
Reading the Relay Status Using Modbus
C.16
Reading the Relay Status Using Modbus
The SEL-701 Relay Modbus Register Map provides fields that allow you to read
the present relay self-test results. Read the two registers starting with Modbus Map
address 160h.
shows how to interpret the results.
Table C.16
Relay Self-Test Result in Bit Definition
All bits, except Enabled/Disabled are defined: 0 = Okay; 1 = Failure. The
Enabled/Disabled bit is defined: 0 = Enabled; 1 = Disabled.
Table C.16
Relay Self-Test Result in Bit Definition
Definition
Bits (s)
Register 1
Register 2
0 IA
Offset
Temperature
1 IB
Offset
RAM
2 IC
Offset
ROM
3 IN
Offset
CR_RAM
4 VA
Offset
EEPROM
5 VB
Offset
Battery
6 VC
Offset
RTC
7
N Offset
Learned Cool Time
8
5 V PS
Thermal Capacity
9
–5 V PS
Enabled/Disabled
10
15 V PS
Not Used
11
28 V PS
Not Used
12–15
Not Used
Not Used
Summary of Contents for SEL-701
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