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C0240111-04-05-GB
3.2.2 “MASTER-SLAVE” CONNECTION
Intelligence is distributed instead in the “master-slave”
connections. Suppose we have a unit with 4 cooling
circuits: t
he master card manages circuits 1 and 2 while
the slave card manages circuits 3 and 4
. In this case,
the additional card is not simply an input/output
expansion, but is fully involved managing part of the
unit. The card software is the same and identifies its
functions depending on the card address: the one with
address 1 (odd) will be the master and will
communicate with the card with address 2 (even and
greater). Pay special attention to card addresses for
this reason.
Connect the cards together with a 3-wire shielded
cable connected between terminals J11 of the cards,
as shown in figure 3.2.
Figure 3.2:
“master-slave” connection
3.2.3 “MIXED” CONNECTION:
The “mixed” connection is used in units with 3/4 cooling circuits where an increase in inputs/outputs is
required. The master card manages circuits 1 and 2 while the slave card manages circuits 3 and 4.
Additionally, depending on the required functions or the type of machine, cards used simply as
expansions can be connected. The expansions will be connected to both the master and the slave if the
required inputs/outputs are circuit functions (recovery valves, freecooling,…). They will only be connected
to the master if they are machine functions (pumps, external air temperature,…).
Figure 3.3 shows the connections between the cards and the expansions: a 3-wire shielded cable
connects terminals J11 of the master and slave cards, and a 3-wire shielded cable connects terminals J23
of the master and/or slave cards with terminal J3 or J11 of expansions “E” or “M”.
11
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