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17 LOCAL LAN NETWORK MANAGEMENT
17.1 Purpose of the local LAN network
Connecting the units to the LAN network (meaning the PCO boards mounted on each unit) allows the following functions to be
performed:
•
balancing the operating hours among the different units by rotating the reserve units (Stand-by);
•
turning on the reserve units in case other units should turn off due to an alarm, maintenance or power feed interruption;
•
turning on reserve units to offset the excessive thermal load;
•
checking up to 15 units with a single user terminal (shared user terminal);
•
operating with all units based on the average temperature and humidity values read by the temperature probes only in
the operating units.
OBLIGATION:
To allow the LAN to operate correctly, the units must have the same software version and revision (e.g.:
ME21r00).
If there is more than one version, update to the latest version or create two different LAN's.
WARNING:
The ME software is not compatible with the previous versions (LD).
17.2 Preliminary operations
17.2.1
Introduction
As the BIOS contained inside the control board is already fitted out to manage a local network connection of the board:
•
it cyclically performs a check-up of the hardware (of the local board) required for network communication and of its
settings (for example, the network address, which must be different from 0);
•
it cyclically performs a check-up of the connection status of the local unit with the rest of the LAN;
•
it cyclically performs a global checkup of the rest of the LAN which can be seen by the unit in question;
•
it cyclically performs the transmission and reception routine of the variables of the local unit involved in transmission.
For correct operation of the units connected to the local LAN network, it is necessary to perform the following operations.
17.2.2
Network cabling
For the purposes of setting a local LAN network among the units, it is necessary for the installer to lay an electrical connection
among the same by means of a screened cable (not included in the supply).
INFORMATION:
it is recommended to use twisted couple of AWG24 cabling (2 wires in total) + Belden 8723 or 8102 type
sheath.
WARNING:
The electrical connections must be installed by qualified staff, when the unit is off and not fed. The LAN
serial low safety voltage (SELV) cabling must be kept safely far from the power cables.
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