Lenze CANopen control technology - Manual (Page 38)

Control technology | CANopen communication manual
Preparing the field devices
Connecting the Engineering PC to the Industrial PC
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DMS 4.2 EN 07/2011 TD17
7.3 Connecting the Engineering PC to the Industrial PC
To commission the field devices, an online connection is required between the Engineering
PC and the field device. To establish an online connection between an Engineering PC and
a field device (like a controller), two ways are possible:
If the control is not started yet, directly connect the Engineering PC to the CANopen bus to
commission the field devices. To activate the Engineering PC, use e.g. the USB system bus
adapter (EMF2177IB). Then the download times are optimal and is it not necessary to
commission the control first.
As soon as the control has been commissioned, no direct coupling should be used anymore
since it may disturb the real-time capability of the bus. This especially applies to the bus
line CANopen Motion bus. Here, the transmission of the sync telegram on time can be
prevented so that an increased jitter on the fieldbus may be the result.
Moreover, each field device requires a second parameter data channel in case of an
independent bus access by two masters. For some device types, the parameter data
channel must be installed separately, e.g. in case of the 9400 Servo Drives.
As an option, some controllers can operate two independent CAN interfaces (e.g. ECS servo
system). In this case, one interface can be used for the connection with the control system,
the other for direct coupling of the Engineering PC. Thus, two buses are created which are
physically independent. In this case, the real-time capability of the nodes at the Motion bus
cannot be influenced even with direct coupling. However, the wiring effort increases.
Direct coupling IPC as gateway