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FP Σ User's Manual
3.6 Clock/Calendar Function
35
3.6 Clock/Calendar Function
The clock/calendar function can be used if the backup battery (see page 95) is installed in the
FP
Σ
. There are no default clock/calendar settings, so the programming tool or another means
must be used to specify these values.
3.6.1 Memory Area for Clock/Calendar Function
With the clock/calendar function, clock and calendar data stored in special data registers
DT90053 to DT90057 can be read and used in sequence programs. To access special data
registers and special internal relays, use the PLC-independent system variables.
X: Available, –: not available
Special
data
register
FPWIN Pro
system variable
Upper byte Lower byte Reading Writing
DT90053 sys_w_RTC_HourMin
Hour data
16#00–16#23 Minute data
16#00–16#59
X –
DT90054 sys_w_RTC_MinSec
Minute data
16#00–16#59 Second data
16#00–16#59
X X
DT90055 sys_w_RTC_DayHour
Day data
16#01–16#31 Hour data
16#00–16#23
X X
DT90056 sys_w_RTC_YearMonth
Year data
16#00–16#99 Month data
16#01–16#12
X X
DT90057 sys_w_RTC_DayOfWeek –
Day-of-the-week data
16#00–16#06
X X
DT90058 sys_w_RTC_Set
Bit 15=TRUE (16#8000): activates
clock/calendar setting
Bit 0=TRUE (16#0): sets seconds to 0
X X
3.6.2 Settings for Clock/Calendar Function
The clock/calendar values are backed up using a battery. Therefore, the clock/calendar
function cannot be used unless a battery has been installed
.
There are no default clock/calendar settings, so the programming tool or another means must
be used to specify these values. There are two ways to set the clock/calendar function:
Using the programming software
1. Online → Online Mode
2. Monitor → Display Special Registers → Calendar Functions
3. Enter the desired date and time values