Schweitzer Engineering Laboratories SEL-701-1, Instruction Manual

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SEL-701-1 Monitor
Date Code 20011009
Modbus
®
RTU Communications Protocol
Controlling Output Contacts and Remote Bits Using Modbus
C.14
Controlling Output Contacts
and Remote Bits Using Modbus
The SEL-701-1 Monitor Modbus Register Map ( Table C.18 on page C.18 )
includes three fields that allow a Modbus Master to control monitor output contacts and
Relay Word Remote Bits (see
Appendix B: SELogic® Control Equations and
Monitor Logic ). Use Modbus function codes 06h or 10h to write the appropriate
command codes and parameters into the registers shown in Table C.14 .
Table C.15 defines the command codes, their function and associated parameters,
and the function code used to initiate the code.
Table C.14 SEL-701-1 Monitor Modbus Command Region
Address Field
0030h Command Code
0031h Parameter 1
0032h Parameter 2
Table C.15 Modbus Command Codes
Command
Code Function Parameter Definition
Modbus
Function
Code
01
a
Start No Parameters 06h, 10h
02
a
Stop No Parameters 06h, 10h
03
a
Emergency
Restart
No Parameters 06h, 10h
04
a
Reset Trip,
Targets
No Parameters 06h, 10h
05
Pulse Output
Contacts Parameter 1:
1
TRIP
2 OUT1
3 OUT2
4 OUT3
5 ALARM
Parameter 2:
1-15; Pulse duration in minutes
Default to 1 second if not supplied10h
Default to 1 second if not supplied10h
10h