Siemens SIMATIC NET CP 343-1 Manuel d'utilisateur télécharger pdf (Page 67)

9 Further Notes on Operation

B−67

CP 343-1 Advancedfor Industrial Ethernet / Manual Part B

Release 06/2008

C79000-G8976-C202-04

Forwarding the time-of-day message

You can configure the direction in which time-of-day messages are forwarded in

STEP 7 / NCM S7 in the properties dialog of the CP as follows.

S Configuration “from station to LAN”

The CP forwards time frames from the CPU to Industrial Ethernet when the

local CPU is time master (SIMATIC mode only) or when the time of day is

forwarded by a different CP on the K bus.

S Configuration “from LAN to station”

The CP forwards time frames from Industrial Ethernet to the CPU when one of

the following components is time master:

− In the SIMATIC mode:

− a remote CPU 41x

− a SIMATIC NET time transmitter

− a CP 1430 TF

− an NTP server when using the NTP mode

As default, time-of-day synchronization is not activated for the CP and it does not

therefore forward the time. However, the internal clock of the CP is synchronized

even in this case if a time-of-day frame is received from the communication bus or

from Industrial Ethernet.

Synchronization using one of the two modes described here must be configured in

STEP 7 in the properties dialog of the CP − “Time-of-Day Synchronization” tab.

For more detailed information on the parameters and options, please refer to the

online help in the properties dialog.

Coordinating forwarding of the time of day with several CPs

If there is more than one CP in a station connected to the same network, only one

of these CPs is allowed to pass on time-of-day messages.

You can therefore made the following settings in the configuration:

S Automatic

The CP receives the time-of-day message from the LAN or from the station and

forwards it to the station or to the LAN.

If several CPUs are being operated in the station, this automatic setting can

lead to collisions. To avoid this, you can specify the direction of forwarding with

the following options:

S From station to LAN

S From LAN to station

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Siemens SIMATIC NET CP 343-1 Manuel d'utilisateur Page 67