2
0
1
8
-1
2
32
Installation
3.4
Maximum Number of I/O Modules
FB6210* - 6215*
I/O modules of type FB621* have separate auxiliary power connectors for electronics and field
circuits. The field circuits are supplied with auxiliary energy via booster terminals, the
electronics are supplied via the backplane connectors from the system power supplies
FB9206*(DC) and FB9215*(AC). With the advantage that the system power supplies will only
be exposed to the low power requirements of the electronics part. In the case of DC power
supply, the booster terminals are connected directly to the backplane power supply, and in the
case of AC to the output of an additional power supply type FB9205*. However, the total power
loss of FB621* modules and any additional FB9205* power supplies must be taken into
account when considering the heat of the surrounding enclosure.
Danger!
Explosion hazard through power overload
Excessively high power can cause the maximum permissible temperature within the enclosure
and the maximum permissible surface temperature of the surrounding enclosure to be
exceeded.
Perform a heat calculation to determine the maximum number of I/O modules. Do not install
additional loads if the maximum permissible number of I/O modules is installed in the
surrounding enclosure.
Note!
The maximum number of I/O modules that can be installed, taking into account the temperature
class, is determined by the permissible power dissipation in the surrounding enclosure. If, in
addition to the FB remote I/O, other loads are installed, their power consumption may reduce
the power available to the FB remote I/O.
The power consumption of the I/O modules, gateway, and power supplies can be found in the
associated datasheets. For some devices, the datasheet gives the power dissipation in addition
to the power consumption. This specifies the power that is converted into heat in the device
and is decisive for the calculation of heat in the surrounding enclosure. If the power dissipation
is not specified in the datasheet, it can be calculated using the power consumption.
