Power Losses For I/O Modules - GE VersaPoint IC220PBI002 User Manual

3
Interfacing to Functional Earth Ground (FE)
There is no interfacing to functional earth ground (FE) in the module, i.e. no
direct connection is made with FE when the module is mounted on a
grounded DIN rail.
Grounding
A module is grounded via the voltage jumper FE when snapping it onto the
previous module. Additional I/O module grounding is not required.
Electrical Isolation
Electrical isolation is not provided by VersaPoint I/O modules. A Power
Terminal module must be used for this purpose.
Voltage Ranges
Low-level signal terminals are available for different voltage ranges. To
utilize different voltage ranges within a station, a new power terminal must
be used for each range.

Power Losses for I/O Modules

Power Loss of the Electronics
The electronics power loss of an I/O module can be calculated following the
formula in the module's datasheet. The power loss of the module must not
exceed the power loss of the housing.
Power Loss of the Housing
The power loss of the housing indicates the maximum power loss allowed.
The maximum power loss is indicated in the module's datasheet. This power
loss can be dependent or independent of the ambient temperature. If the
power loss of the housing depends on the ambient temperature, a
permissible operating temperature range can be calculated using the
formula in the module's datasheet.
Permissible Operating Temperature Range
Depending on the power loss of the housing and the power loss of the
electronics at a certain current, the temperature up to which the module can
be operated with this current can be calculated. Please see the module
datasheets for specific information.
See appendix C for example calculations.
3-4 VersaPoint™ I/O System Profibus-DP NIU User's Manual – August 2005 GFK-1911B