7 Operation
You can connect your constant temperature equipment directly to a PC
via the Ethernet interface or integrate it into a local network so that the
equipment can be controlled using a LAUDA command set.
The configuration for the Ethernet interface is stored in the con-
stant temperature equipment. If the interface module is installed in
a different device, the settings must be reconfigured there.
The command performance achieved via the Ethernet depends on multiple
factors, including the following criteria:
Ideally, the constant temperature equipment and control station / PC
should be located in the same (sub)network, otherwise the number of
interconnected routers or switches should be kept to a minimum.
A cable connection (LAN) to the control station / PC is usually more
reliable for data transmission than a wireless connection (WLAN).
Excessive network utilization can slow down the exchange of commands
considerably.
Data is exchanged between the constant temperature equipment and an
external application via the Ethernet interface in line with the command/
response principle. In other words, a new command is usually only issued
once the constant temperature equipment has responded to the previous
command.
Under ideal conditions, commands can be sent to the constant temperature
equipment every 100 ms. If the network load is high or a WiFi connection is
being used, commands may have to be issued at intervals of more than 1 s.
A transmission rate of 500 ms is appropriate for many periodic commands
(such as
Actual value of external temperature
). If this value is used as a control
variable in the constant temperature equipment, a slower transmission rate
will impair the control action.
Command performance
V2R4
Interface module LRZ 921
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