用SFC1，但你的输出应该是一个范围（可以很小），否则输出控制的设备捕捉不到。例字：
Data Type Length (bits) Format
DATE_AND_TIME 64 Yr-Mo-Day-hr:min:s.ms
or
DT Format Example
DT#1995-02-02-08:30:01.999
The DATE_AND_TIME data type is stored in BCD format:

Byte Contents Range
0 Year 1990 to 2089
1 Month 01 to 12
2 Day 1 to 31
3 Hour 0 to 23
4 Minute 0 to 59
5 Second 0 to 59
6 2 MSD of ms 00 to 99
7 (4 MSB) LSD of ms 0 to 9
7 (4 LSB) Day of week 1 to 7 (1 = Sunday)
Display of bytes 6 and 7:

MSD: Most Significant Decade

LSD: Least Significant Decade