Technology Option F01 08.2012
6SE7087-6QX70 (Version AN) Siemens AG
9-142 Compendium Motion Control SIMOVERT MASTERDRIVES
9.7.3 Synchronism with the virtual master axis by means of clock-
synchronized Profibus (suitable for private study)
The objective is to use the equidistance (clock synchronism) of the
PROFIBUS to achieve synchronism via the PROFIBUS only and to
dispense with SIMOLINK, which has been necessary to replace the
data for synchronous operation.
PROFIBUS operation is only possible with an external bus master e.g.
SIMATIC S7 (see MC Compendium Section 8.2.2. ff).
The "Drive ES Basic" tool is needed for configuring. A CBP2 is required
for the "clock synchronous PROFIBUS" mode. The number of (clock
synchronous) nodes is limited to max. 10..
Make sure that the baud rate of the PROFIBUS is set to 12 Mbit/s so
that the data of the technology are transmitted fast enough. Also, select
PROFIBUS as the synchronization source in parameter P744
(SIMOLINK board, function diagram 140).
Finally, activate the equidistance (clock synchronism) when configuring
the hardware under the S7 project.
To achieve this, make the following connections on the drive control
units:
1) Select PROFIBUS as the synchronization source (in function
diagram SIMOLINK Board FP140)
WRITE 744 1 0 ; Synchronization source PROFIBUS
WRITE 744 2 1 ; Synchronization source PROFIBUS
2) Provision of transmit data (function diagram 125) on the "master
axis" unit
The position and velocity setpoint of the virtual master axis (KK817
and KK820) and the generated sign-of-life signal (K255) are entered
in the transmit data (parameter 734).
WRITE 734 15 820 ; Velocity of the virtual master axis on
PROFIBUS
WRITE 734 16 820 ; Velocity of the virtual master axis on
PROFIBUS
WRITE 734 11 817 ; Position of the virtual master axis on
PROFIBUS
WRITE 734 12 817 ; Position of the virtual master axis on
PROFIBUS
WRITE 734 13 255 ; Sign-of-life signal on PROFIBUS
NOTE
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