Mounting and connection
4.4 Communication with S7-200
OP 73micro, TP 177micro (WinCC flexible)
Operating Instructions, 09/2007, 6AV6691-1DF01-0AB0
65
● Comment
This is where you can save a comment which describes the use of the area pointer, for
example.
Function
The PLC describes the data area of the "Date/Time PLC" area pointer. All specifications are
coded in BCD format.
The HMI device reads the data cyclically based on the configured acquisition cycle and
synchronizes itself.
Note
Do not configure an extremely short acquisition cycle for the date/time area pointer because
this will have a negative influence on HMI device performance.
Recommendation: Acquisition cycle of 1 minute, if the process allows this.
The HMI device time has a resolution of seconds, regardless of the acquisition cycle.
The date/time data area has the following structure:
DATE_AND_TIME format (in BCD code)
Most significant byte Least significant byte Data word
7 . . . . . . 0 7 . . . . . . 0
n+0 Year (80-99/0-29) Month (1-12)
n+1 Day (1-31) Hour (0-23)
n+2 Minute (0-59) Second (0-59)
n+3 Reserved Reserved Weekday
(1-7, 1=Sunday)
n+4 Reserved Reserved
n+5 Reserved Reserved
Note
Note that when you set a Year value, the system sets the years 1980 through 1999 when 80
to 99 is set and the years 2000 through 2029 when 0 to 29 is set.
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