Lenze PC-based automation - Manual (Page 45)

DMS 1.3 EN - 02/2011
L
45
Control technology| System manual
System architecture
IPC as gateway
6.1.2 IPC as gateway
In the second case, the Engineering PC is not provided with a special fieldbus coupling. Only
the Ethernet interface available as standard is required. The implementation from Ether-
net to the fieldbus is made via the Industrial PC.
Advantage:
The Engineering PC does not require a special interface connection
The Engineering PC is the only master for the bus and can thus guarantee the real-time ca-
pability of the bus since it controls the access to the bus itself. Thus, it is ensured that the
bus is always free for the control if required.
Disadvantage:
The gateway can only be used if the basic configuration of the IPC and the bus has been
carried out.
The communication speed for a download to a field device using the Engineering PC is slo-
wer than with direct coupling. The extent of delay depends on whether the control is active
itself at this moment or only the gateway of the IPC is used.
Conclusion
Direct coupling is an appropriate means to commission field devices for the first time
(download). The download times are optimal and it is not required that the control has to
run.

Note!
• The "IPC as gateway" function is not available in combination with PROFIBUS.
• Thus, "Going online" with the »Engineer« or the »GDC« via the IPC as gateway
is not possible.