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Serial communication, LON
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The HV/Control software module is intended to be used for control functions in REx
5xx terminals. This module contains the process picture, dialogues and process data-
base for the control application in the MicroSCADA.
The HV/REx 500 software module is used for setting and monitoring of the terminal
via the MicroSCADA screen. At use of this function the PST Parameter Setting Tool
(of v1.1 or higher) is required.
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The parameters for the LON communication are set via the local HMI. Refer to the
Technical reference manual for setting parameters and path in local HMI.
Use the LNT, LON Network Tool to set the LON communication. This is a software
tool applied as one node on the LON bus. In order to communicate via LON, the termi-
nals need to know which node addresses the other connected terminals have, and which
network variable selectors should be used. This is organised by the LNT.
The node address is transferred to the LNT via the local HMI by setting the parameter
ServicePinMsg=YES. The node address is sent to the LNT via the LON bus, or the LNT
can scan the network for new nodes.
The speed of the LON bus is set to the default of 1.25 MHz. This can be changed by the
LNT.
If the LON communication from the terminal stops, caused by setting of illegal com-
munication parameters (outside the setting range) or by another disturbance, it is possi-
ble to reset the LON port of the terminal.
By setting the parameter LONDefault=YES, the LON communication is reset in the ter-
minal, and the addressing procedure can start from the beginning again.
There are a number of session timers which can be set via the local HMI. These settings
are only for advanced use and should only be changed after recommendation from
ABB.
400
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