Real-time clock

Notes on real-time clock

The real-time clock is an optional function for AC500-eCo Basic processor modules (e.g. PM5012-x-ETH) and require a TA5131-RTC. All other AC500-eCo processor modules have an integrated real-time clock.

The real-time clock operates as a PC clock. It saves date and time to a DWORD in DT format (DATE AND TIME FORMAT), i.e., in seconds passed since the start time: 1 January 1970 at 00:00.

For AC500-eCo, Basic CPU with TA5131-RTC buffers the real-time clock for 7 days, and Standard/Pro CPU buffers the integrated real-time clock for 20 days. When the CPU is not powered over the buffering time, the real-time clock data will be cleared.

If a battery is connected and full, the real-time clock continues to run even if the control voltage is switched off.

If no battery is inserted or the battery is empty, the real-time clocks starts with the value 0 (=1970-01-01, 00:00:00).

When switching on the control voltage, the system clock of the operating system is set to the value of the real-time clock.

Real-time clock with PLC browser

The PLC browser/PLC shell commands ‎date‎ and ‎time‎ are used to set the real-time clock.

The commands ‎date‎ <ENTER> or ‎time‎ <ENTER> display the current date and time of the real-time clock.

The command: ‎date yyyy-mm-dd‎<ENTER> (year-month-day) sets the date.

The command: ‎time hh-mm-ss‎<ENTER> (hours-minutes-seconds) sets the time.

Example:

The real-time clock should be set to 22 February 2005, 16:50.

Enter the date:

‎ date 2005-02-22<ENTER>‎

Display: ‎date 2005-02-22 Clock set to 2005-02-22 08:01:07‎

The time remains unchanged.
Enter the time:

‎time 16:50<ENTER>‎

Display:‎ time 16:50 Clock set to 2005-02-22 16:50:00‎

Real-time clock with user program

The following function blocks located in the folder "Realtime clock" of the system library ABB_ExtUtils_AC500.lib can be used to set and display the real-time clock (RTC) with help of the user program:

Function block	Function
CLOCK “Library Manager ABB-AC500 Use Cases AC500 Utils PM<Version> (ABB) Function Blocks Realtime clock”	Sets and displays the real-time clock with values for year, month, day, hours, minutes and seconds. Also the day of week is indicated (Mo=1, Tue=2, Wed=3, Thu=4, Fr=5, Sa=6, Su=0). Note: The week of day cannot be set. It is given by the real-time clock. The input DAY_SET is ignored.
CLOCK_DT “Library Manager ABB-AC500 Use Cases AC500 Utils PM<Version> (ABB) Function Blocks Realtime clock”	Sets and displays the real-time clock in DT format, for example DT#2005-02-17-17:15:00.

Function block

Function

CLOCK “Library Manager ABB-AC500 Use Cases AC500 Utils PM<Version> (ABB) Function Blocks Realtime clock”

Sets and displays the real-time clock with values for year, month, day, hours, minutes and seconds.

Also the day of week is indicated (Mo=1, Tue=2, Wed=3, Thu=4, Fr=5, Sa=6, Su=0).

Note: The week of day cannot be set. It is given by the real-time clock. The input DAY_SET is ignored.

CLOCK_DT “Library Manager ABB-AC500 Use Cases AC500 Utils PM<Version> (ABB) Function Blocks Realtime clock”

Sets and displays the real-time clock in DT format, for example DT#2005-02-17-17:15:00.

Reference for function blocks, functions, structures etc.⮫ “Reference, function blocks”