Specifications

Real-time clock functions CP143 H1 / TCP/IP manual
5-20 Rev. 00/07
Please note: the format for the time and the cycle time must be configured in
the same way throughout your system!
The last byte of the ethernet address of each CP must be different!
Time format
MMS format
This is the only format allowed for synchronizing foreign modules. The MMS formatted
timing message is formatted as follows:
---- tttt Byte 0 Time in ms, starting from 0:00 hours
tttt tttt Byte 1
tttt tttt Byte 2
tttt tttt Byte 3
dddd dddd Byte 4 Date in days, starting from 1.1.1984
dddd dddd Byte 5
vkkk kk-- Byte 6 Sign v: 0=+, 1=-; time difference steps of in 0,5 hrs.
---- --e- Byte 7 Flag e: 0=time from DCF; 1=from dynamic master
BCD-Format
The BCD format is a plain and readable alternative. If you are only employing VIPA CP143
modules the CPs can be configured to accept BCD formatted messages.
1/10s 1/100s Byte 0 Fractional seconds
10s 1s Byte 1 Seconds
10m 1m Byte 2 Minutes
ab10h 1h Byte 3 Mode a: 0=12h, 1=24h; b: 0=AM, 1=PM; hours
wwww ---- Byte 4 0=Monday ... 6=Sunday
10T 1T Byte 5 Day of Month
10M 1M Byte 6 Month
10J 1J Byte 7 Year
v--k kkkk Byte 8 Sign v: 0=+, 1=-; time difference in steps of 0,5 hours.
---- 1/1000s Byte 9 1/1000s
ssss --em Byte
10
Clock status s: (=clock status in ANZW);
Flag e: 0=time from DCF; 1=time from dynamic master
Module validity m: 0=valid, 1=not valid
The module validity indicates that the current master CP was configured successfully and
that it does not use default parameters.