19
AC30 series General Purpose I/O Option
Real-Time Clock (7004-01-00 and 7004-03-00)
A real-time clock (RTC) is provided in the 7004-01-00 and 7004-03-00 for
the user to program the drive to perform functions at specified times.
The RTC is battery-backed, so continues to run when the drive is
unpowered. The battery recharges when the drive is powered.
NOTE: The clock may not hold the time if the drive is powered off until
the battery has been charged. The charging takes up to 48 hours.
The user can adjust the time and date.
The user can also adjust the RTC rate if it is found to run too fast or too
slow over a long period of time. Adjustment is achieved through an RTC
trim parameter. A positive value causes the RTC to run faster. A negative
value causes the RTC to run slower.
Each increment or decrement in RTC trim value causes the RTC to run
faster or slower respectively by 1 part in 1048576, or approximately 1 part
per million (ppm). 1ppm is equivalent to approximately 2.5 seconds per
month or 31 seconds per year.
Programming
Parameter Access
Value
Description
1186
Write or
read
See RTC
value format. RTC time and date.
1187
Write or
Read
0 ± 40
RTC trim. Allows the user to adjust
the RTC clock rate.
RTC value format
YYYY/MM/DD HH:MM:SS
YYYY = calendar year (Range 1970 to 2106)
MM = calendar month (Range 01 to 12)
DD = day of the month (Range 01 to 31)
HH = hour (Range 0 to 23)
MM = minutes (Range 0 to 59)
SS = seconds (Range 0 to 59)
