ES4441.1 Compact Error Simulation Module with Breakout Frontpanel - User´s guide
45
ETAS
Hardware Features
4.2.2
Pin-to-Pin Resistance
There are underlying conditions for the error type ”Pin-to-Pin Resistance” –
depending on whether the load is connected and whether there is finite resis-
tance between the pins. Tab. 4-1 shows the underlying conditions for the possi-
ble configurations.
Tab. 4-1
Possible Configurations with Pin-to-Pin Resistance
The first column shows whether there is a finite resistance for the contact bet-
ween the lines or not; the second whether the load is connected during error
simulation or not.
The fourth column tells you whether a loose contact can be simulated or not in
each particular case.
4.2.3
Relay or MOSFET
Using MOSFETs has the advantage of disappearing switching times – minimal
leakage currents are usually no problem for most types of error. If, however, they
are, you can use relays to generate errors.
Please note, however, that error types which are switched via MOSFETs, can only
be realized individually (see Abb. 4-1 on page 44).
4.2.4
Duration of the Error State
The period of time for which an error is active can be of interest for measuring
latencies of the diagnostic system. For example, the ES4441.1 can simulate a
specific error for 20 ms, but the ECU software requires at least 30 ms to generate
an error memory entry.
The required duration of the error state is set in the PINCONTROL user interface.
The selectable duration is between 45 ms and 65534 s for relays and between
1
μ
s and 65534 s for MOSFETs – it can be set in intervals of 1 ms for relays or
1
μ
s for MOSFETs.
4.2.5
Simulating Loose Contacts
Certain types of error on error channels can not only be realized as errors with a
defined duration but also as loose contacts. These errors are controlled by a
pulse-width modulation with a switching frequency up to 25 kHz and a duty
cycle of 0% - 100%.
With the ES4441.1 Compact Error Simulation Module is possible to simulate a
loose ground contact (channel 340) and a loose power contact (channel 339).
Resis-
tance
Load
Connected
Swit-
ched
with
Loose Con-
tact
Finite
Yes
MOSFET
Possible
0
Ω
Yes
MOSFET
Possible
Finite
No
This configuration is not
possible
0
Ω
No
Relay
Not possible
