Lenze PC-based automation - Manual (Page 44)

Control technology| System manual
System architecture
IPC as gateway
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DMS 1.3 EN - 02/2011
6.1 IPC as gateway
The Engineering PC is not only required for commissioning the Industrial PC but also for
commissioning the subordinated field devices. To establish an online connection between
an Engineering PC and a field device, e.g. a controller, two ways are possible:
Direct coupling
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IPC as gateway
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6.1.1 Direct coupling
In case of direct coupling, the Engineering PC has a special interface module for the corre-
sponding fieldbus, e.g. a USB system bus adapter for coupling to the CANopen bus system.
Advantage:
The connection of the Engineering PC to the drive is totally independent from the control.
Thus, it is irrelevant whether the control is already available in the system, or already com-
missioned, etc.
The speed at data transmission is optimal with direct coupling. The IPCs are used as gate-
way, this optimal speed cannot be achieved.
Disadvantage:
A special interface connection is required for the Engineering PC
The communication of the Engineering PC with the field device may interfere with the bus.
It is, for instance, possible that the real-time capability of the control is disturbed by the En-
gineering PC since the Engineering PC overloads the bus or transmits telegrams at times
the control needs for transmission of synchronisation protocols.