Time Synchronization; Profibus-Dp Master - Siemens SIPROTEC 7SA522 Manual

4.4

Time synchronization

4.4.1

PROFIBUS-DP master

Parameterization
SIPROTEC PROFIBUS-DP - Communication profile
C53000-L1840-B001-03
The PROFIBUS-DP slave of the SIPROTEC devices can use time synchronization
messages via PROFIBUS System Management Service for time synchronization.
Preconditions:
• the PROFIBUS-DP master must be able to send time synchronization messages
and must have a corresponding parameterization,
• only one master station may send time messages in the PROFIBUS net,
• the evaluation of time synchronization messages in the PROFIBUS-DP slave is
enabled,
• PROFIBUS has to be selected for "Source of time synchronization" in the SIPRO-
TEC device.
The following PROFIBUS-DP masters can e.g. transmit time synchronization mes-
sages via PROFIBUS System Management Service:
• SIMATIC S7 CPU 412-2DP...CPU 416-2DP, CPU 414-3DP, CPU 416-3DP with
firmware from V3.0 respectively,
• SIMATIC S7 400 PLC Series with Communication Processor Module CP 443-5
Extended V2.0 or higher (6GK7 443-5DX02-...),
• WinCC Version 5 with Service Pack 2 or higher, Communication Processor Card
CP 5613 and WinCC Option Basic Process Control (BPC).
A PLC S7-400 system with Communication Processor Module CP 443-5 Extended
and parameterization software STEP7 is used as an example for the parameterization
of a master station:
1. The CPU has to be defined as master for time synchronization.
Select the following settings in HW Config of STEP7 in the dialog window
Properties CPU 4xx (ref to Figure 4-8):
• Synchronization in the PLC: "As master"
• Time Interval: "1 minute", "10 seconds"
• Correction Factor to compensate deviation of the master clock (if necessary).
2. The PROFIBUS-DP master (CP 443-5 Extended) has to be configured to relay the
time synchronization messages to the PROFIBUS-DP slaves.
Select the following settings in HW Config of STEP7 in the dialog window
Properties CP 443-5 Ext (ref. to Figure 4-9):
• Pass on time-of-day frames: "From station to LAN"
1 Time intervals of less than 1 minutes are supported with PROFIBUS-DP communica-
tion module firmware version 03.01.03 or higher, see notes on page 4-76.
PROFIBUS-DP - Parameterization in DIGSI
1 1
or "1 second"
75