Limit systems shall be applied to each bus in terms of absorption
and maximum wiring distance, as shown in the previous page.
Therefore, it is not possible to supply a system consisting of two
or more buses with only one power supply unit 035 60, connected
to each other by interfaces configured in “physical expansion”
mode even if the number and type of components connected to
the system do not exceed the set maximum absorption. Positions
I3 and I4 shall be configured according to the configuration of the
Automation devices in the two systems connected to each other.
With reference to the picture, let us suppose, for example, that
I3=2, I4=7:
• On the input bus (IN), the addresses of Automation devices No.
1 must be between A=1 / PL=1 and A=2 / PL=6;
• On the output bus (OUT), the addresses of Automation devices
No. 2 must be between A=2 / PL=8 to the address of the next
interface.
With very extended systems or with current absorption exceeding a limit of 1.2 A supplied by the power unit 035 60, it is necessary to
divide the system into several sections supplied with their own power supply unit and connected between each other with a special
interface (SCS/SCS gateway 035 62) configured in “physical expansion” mode.
PHYSICAL EXPANSION
Distances and maximum
number of devices
A/PL = 11 26
A/PL = 55 99
A/PL = 28 53
1
2
3
SCS/SCS
gateway
035 62
SCS/SCS
gateway
035 62
I1 = –
I2 = –
I3 = 2
I4 = 7
M = 1
I1 = –
I2 = –
I3 = 5
I4 = 4
M = 1
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