17
Appendix B
Modbus Register Formats
Register Formats
The following are the available register formats that are used throughout the register map.
•
MSW = most significant word (16 bits)
•
LSW = least significant word (16-bits)
Double Word Register
Table 6 - Double Word Register Format
Number Description
Start
MSW
Start + 1 LSW
Elapsed Time Register
•
Range: 0
–
3,599,999 seconds (1000 hours)
•
Write LSW first when writing in seconds format
•
Use the Time Format coil to switch the format
Table 7 - Elapsed Time Register Format
Number Description (Seconds Format)
Description(H:M:S Format)
Start
Seconds (MSW)
Hours
Start + 1 Seconds (LSW)
Minutes
Start + 2 Reserved
Seconds
