ES4440.2 Compact Failure Simulation Module - User’s Guide 15
ETAS Introduction
the failure in the software to switching: MOSFET 200 μs, relay 5 ms). The disad-
vantage when using MOSFETs is to do with the leakage currents which occur;
these do not occur with relays.
If conventional relays are used for a failure mode, the delay between setting the
failure and closing the corresponding relay is measured on a reference relay and
then sent to the application. This enables the precise measuring of the time the
failure actually occurs and also, for example, the duration of the failure state.
Resistor Cascade
To simulate, for example, contact corrosion in a line and crosstalk between lines,
there is a resistor cascade with which the corresponding resistances (line resis-
tance and finite resistance between lines) can be simulated.
This is a 14-bit cascade with resistors from 2 to 16384 , with which resis-
tances from 2 to approx. 32 k can be displayed in 2 intervals. For more
information on the resistor cascade, refer to the section "Resistor Cascade"
on page 24.
1.7.2 Connectors, Displays and Fuses
Connectors on the Front Panel and Rear
The ES4440.2 Compact Failure Simulation Module has several connectors on the
front and rear for connecting the ECU and loads, addressing the ES4440.2 and
for master/slave operation.
The following connectors are on the front panel:
• Connector for synchronization signals when using several ES4440.2s in
master/slave operation ("”SYNC” Connector" on page 31)
• Connector for CAN bus ("”CAN” Connector" on page 32)
• Connector for Ethernet ("”Ethernet” Connector" on page 32)
• Connector for measuring currents between the two failure rails with the
failure modes ”Pin-to-Pin Resistance”, ”Inline Resistance” and ”Leakage
Current” ("”Current” Connector" on page 33)
The following connectors are on the rear:
• Connector for connecting the failure rails when using several ES4440.2s in
master/slave operation ("”Rail 1/2” Connector" on page 33)
• Connector for the 16 high-voltage ECU signals ("”ECU HV” Connector"
on page 33)
• Connector for the load to the channels above ("”LOAD HV” Connector"
on page 35)
• Connector for the 64 high-current ECU signals ("”ECU CH0-CH42” /
”ECU CH43-CH63” Connector" on page 36)
• Connector for the load to the channels above ("”LOAD CH0-CH42” /
”LOAD CH43-CH63” Connector" on page 40)
• Mains connection with integrated fuse
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