Schweitzer Engineering Laboratories SEL-734 - Table F.14 SEL-734 Meter Output Coils (Fc05 H); Table F.15 Responses to 05 H Force Singe Coil Query Errors; Table F.16 06 H Preset Single Register Command; Table F.17 Responses to 06 H Preset Single Register Query Errors

F.7
Date Code 20090730 Instruction Manual SEL-734 Meter
Modbus RTU Communications Protocol
Modbus RTU Communications Protocol
Coil addresses start at 0000 (i.e., Coil 1 is located at Coil address 0000). If the
meter is disabled or the breaker jumper is not installed, it will respond with
error code 4 (Device Error).
In addition to Error Code 4, the meter responses to errors in the query are
shown in Table F.15.
06h Preset Single
Register Command
The SEL-734 uses this function to allow a Modbus master to write directly to
a database register. Refer to the Modbus Register Map in Table F.23 for a list
of registers that can be written using this function code. If you are accustomed
to 4X references with this function code, for six-digit addressing, add 400001
to the standard database addresses.
In Table F.16, the command response is identical to the command request.
The meter responses to errors in the query are shown in Table F.1 7.
Table F.14 SEL-734 Meter Output Coils (FC05h)
Output Coil Number Output Coil Name Note
1–3 OUT101–OUT103
4–7 OUT401–OUT404 Returns 0 if not installed
8–23 RB01–RB16
24–39 Pulse RB01–Pulse RB16
Table F.15 Responses to 05h Force Singe Coil Query Errors
Error Error Code Returned
Communication Counter
Increments
Invalid bit (coil) number Illegal Data Address (02h) Invalid Address
Illegal bit state requested Illegal Data Value (03h) Illegal Function
Code/Op Code
Format error Illegal Data Value (03h) Bad Packet Format
Table F.16 06h Preset Single Register Command
Bytes Field
Requests from the master must have the following format:
1 byte Slave Address
1 byte Function Code (06h)
2 bytes Register Address
2 bytes Data
2 bytes CRC-16
Table F.17 Responses to 06h Preset Single Register Query Errors
Error Error Code Returned
Communication Counter
Increments
Illegal register address Illegal Data Address (02h) Invalid Address Illegal Write
Illegal register value Illegal Data Value (03h) Illegal Write
Format error Illegal Data Value (03h) Bad Packet Format
Device Error Invalid Access Level (04h) None
Courtesy of NationalSwitchgear.com