Specifications

CP143 H1 / TCP/IP manual Software
Rev. 00/07 5-19
5.7.5 Master clock initialization
Every CP may assume the role of master provided that it has been configured as a master.
You may mix and match VIPA CPs and Siemens CPs. Please ensure that you use the MMS-timing
format as Siemens supports only this format.
From Init you can use Uhr-Init to access the following initialization window:
Fig. 5-10: Master clock initialization
Parameters for master clock initialization
Master clock
When a high level master clock fails the module configured by means of this parameter may
assume the role of dynamic master. However, the CP can only become the dynamic master if
it has the highest priority and if you have ticked master clock.
master clock: you must supply the target address (broadcast or multicast) and, in the case
of multicast, the target ethernet address and the mandatory time-format and
cycle time.
Slave: enter the mandatory time-format and the cycle time
Target address
Broadcast
Timing messages are sent to every station on the LAN. The address is set automatically to
FFFFFFFFFFFFh. This can not be changed.
Multicast
Timing messages are only sent to stations on the LAN that are a member of the multicast
circuit specified by means of the address.
Address
This address is FFFFFFFFFFFFh when broadcast has been selected. For multicast you must
specify a single address or a multicast circuit by means of the address.
Cycle time for SYNC messages
Here you may determine the cycle time for the transmission of synchronization messages in
the range of 1...60 seconds.
The synchronization message is transferred in MMS- or in BCD format.