Specifications

CP143 H1 / TCP/IP manual Software
Rev. 00/07 5-17
5.7 Real-time clock functions
5.7.1 General
Many practical situations require that the operations are synchronized and referenced to real time.
The real-time clock functions of the CP143 module may be used to synchronize up to 256 modules
with an accuracy of 10ms. The synchronization is maintained even if the time standard transmitter
should fail.
The real-time clock functions provide the following options
• The time of day is maintained by the system and a battery sustains it should the power supply
fall away.
• The time of the various CPs can be synchronized by means of synchronization messages. In
this way all CPs on the same network use the same time.
• Any CP can be designated as master clock to issue time synchronization messages.
5.7.2 Graphic representation of the real-time clock functions
Fig. 5-8:Graphic representation of the real-time clock functions