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Firmware update
The supply voltage L+ must be available on the I/O module at the start of firmware updates and
during the update.
The firmware can only be updated in the STOP mode of the F-CPU.
Recommendation: Internal sensor supply
We recommend to always use the short-circuit proof internal sensor supply of the F-module.
In the event of an error when using the internal sensor supply, the channel is passivated and the
diagnostics provide information about the cause.
If there are short-circuits in the wiring or at the sensor, the input is also protected.
To guarantee the correct channel-specific reaction in the event of an error of the internal sensor
supply, you must use the sensor supply assigned to the channel. If you do not observe this
assignment, channels that are not affected may be influenced or passivated.
Note
The internal sensor supply is switched off if there is a short-circuit to ground.
The sensor supply is also switched off when the channel detects an overflow.
A check is made as to whether the error is still persisting after about 30 seconds.
External/internal sensor supply
The pictures in "Applications cases of the I/O module (Page 37)" section show how you can
supply the sensors via an external sensor supply (e.g. via another module).
Short-circuit from L+ to I
If there is a short-circuit from I
selected type of circuit.
This can be avoided by an appropriate short-circuit-proof circuit or by using the internal sensor
supply. When using an external sensor supply, other suitable measures are required to protect
the input resistors (external 50 mA "Fast-acting" fuse in the input circuit of the F-module).
(FAIW-016)
F-AI 8xI 2-/4-wire HART HA
Equipment Manual, 09/2021, A5E50557845-AA
WARNING
+ or I
n
-
n
+ or I
-, the input resistors may be destroyed, depending on the
n
n
Connection
4.3 Schematic circuit diagram
19
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