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. Table C .16 shows how to interpret the results.
Table C.16 Re lay Self-Test Resu lt i n 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
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