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Entry type: FAQ Entry ID: 44045424, Entry date: 08/13/2010
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How do you configure a PC station as time master or time slave for time-of-day synchronization via Industrial Ethernet in SIMATIC mode?

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Configure a PC station as time master or time slave for time-of-day synchronization via Industrial Ethernet in SIMATIC mode

Time-of-day synchronization is supported by all three major product families in the SIMATIC range: SIMATIC S7, SIMATIC S5 and PC. This synchronization can be done both via Industrial Ethernet and via PROFIBUS and MPI. There are two modes available for time-of-day synchronization via Industrial Ethernet:

  • SIMATIC mode
  • NTP mode

Time-of-day synchronization via Industrial Ethernet with the SIMATIC mode
This mode is usually used in process automation in conjunction with ISO transport services and is precise to +/- 10ms between the communications processor and the synchronized CPU with a resolution of +/- 1ms.
Since SIMATIC mode is based on SNAP services (ISO Layer 2 service) and works with MAC addresses, it can only be used with local Ethernet networks. This mode does not work with IP networks via IP routers, that is with configured IP subnets.

Configuring time-of-day synchronization for a PC station
CP1613 (A2) and CP1623 are available for doing time-of-day synchronization with the PC. CPU 1613 can be configured with NCM PC as from SIMATIC NET PC software V6.0 (CD 07/2001). Go to the hardware configuration of the PC station and open the Properties dialog of the CP1613 (A2) or CP1623. Switch to the "Options" tab and enable the "Time of day" function. You can parameterize the CP1613 or CP1623 as time slave (receiver).


Fig. 01

The time-of-day synchronization is not automatically transmitted or received by the PC. This has to be realized in the form of an application that writes the time via function calls or reads it from the CP.

Note
More information on time-of-day synchronization via Industrial Ethernet

  • with the S7-400 is available in Entry ID: 18130164.
  • with the S7-300 is available in Entry ID: 44049612
  • with SIMATIC S5 is available in the manual "SINEC CP1430", section 6.6 "Setting and Reading the Time" in Entry ID: 12586144.


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