How are ELAPSED TIME or date/time values stored in Modbus registers in ETC controllers and sensors?

ETC controllers that support Modbus have multiple options for storing date/time as well as elapsed time. This allows you to configure our products to work best with your Modbus drivers and SCADA system.

To configure the format of these registers, set the Time Format coil in the appropriate device. This can be set to Seconds or H:M:S.

Elapsed Time Values

Elapsed time values are used for timers or settings that do not contain a date.

Seconds Format:

• Start: Seconds (MSW)
• Start +1: Seconds (LSW)
• Start + 2: Unused

H:M:S Format:

• Start: Hours
• Start +1: Minutes
• Start + 2: Seconds

Date and Time Values

Date and time values are used for the system time as well as for log events that have a specific moment in time captured.

Seconds Format:

• Start: Seconds since January 1, 2000 (MSW)
• Start +1: Seconds since January 1, 2000 (LSW)
• Start + 2: Unused
• Start + 3: Unused
• Start + 4: Unused
• Start + 5: Unused

H:M:S Format:

• Start: Year
• Start +1: Month
• Start + 2: Day
• Start + 3: Hours
• Start + 4: Minutes
• Start + 5: Seconds