COSMOS DRIVER SERIES 3000 - USE AND MAINTENANCE MANUAL
7.2.8 Sercos menu
The Sercos menu only exists in the Sercos II version
7.2.8.1
SERCOS™ standard features (CEI IEC 1491)
SERCOS™ in an international standard which defines an optical serial real-time interface, between a control unit (master)
and the devices connected to it (slave or drive).
This interface was designed for industrial machines with multiple drives; in this case, the use of the optical fiber is very
important, because it ensures immunity from electromagnetic interferences.
The connection between the control unit and the different drives follows a ring topology, as indicated in the following
picture:
The number of devices that can be serviced per ring depends one the communication cycle time, on the volume of data
to be transferred and on the transmission frequency. In normal operating conditions, with a cycle time of 1 ms and a
transmission frequency of 4 Mbit/s, it is possible to control up to 8 drives per ring. In standard SERCOS, the cycle time
can be selected within 0.062 ms, 0.125 ms, or integer multiples of 0.25 ms:
in our application it is set to 1 ms.
A control unit can service several ring structures thanks to a master for each ring. The master allows synchronizing and
controlling all communication activities concerning the devices in the ring. Direct data exchange between the drives is
not allowed.
7.2.8.2
SERCOS interface configuration
Menu
Entry
Lev.
Description
1.5
>SERCOS
-
It includes the SERCOS controller setting.
1.5.1
ADDRESS
3
Driver physical address. The address must be only
one for all devices in the SERCOS ring. Valid values
must be within a range from 1 to 254. If you set an
address not required by the control unit, the error
SERCOS 21 will occur.
1.5.2
MBAUD
Communication speed. In standard SERCOS, this
parameter is set to 4 MBit/s and 8 MBit/s.
7.2.8.3
SERCOS interface status
It is possible to know the SERCOS interface status at any time, as indicated in the table in paragraph
7.2.9 Analogue menu
Analogue menu is available only in Sercos II version.
Ver. 1.07
Pag. 72
SERCOS ring topology
ring 2
ring 1
Control unit
Master 1
Master 2
slave
slave
slave
slave
slave
single
drive
single
drive
single
drive
single
drive
single
drive
