EDI 242E Manuel d'utilisation - Page 5

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1.4.2 OUTPUT MINIMUM PULSE WIDTH

If desired, the output pulse width for both channels can be set to 100 milliseconds minimum
by installing jumper SEL3.

1.4.3 INPUT PULSE FILTERING

Each channel can be individually configured to modify the default input pulse width
specifications described in section 1.8.5.
Polarity
Filter B
Switch
Switch
OFF
OFF
OFF
OFF
OFF
ON
OFF
ON
ON
OFF
ON
OFF
ON
ON
ON
ON

1.5 OUTPUT (OUT) AND FAULT (FLT) INDICATORS

Each channel provides an OUT and FLT indicator. The OUT indicator illuminates when the
input meets the Pulse Width Accept specifications of 1.8.5 (or as modified by the Filtering
settings of 1.4.2). This state is intended to produce the True (low) state to the controller
unit.
If a cabinet fault or isolator output failure causes the true electrical state of the output to
differ from the intended state, the FLT indicator will illuminate. This may be caused by a
failure of the Model 242E output circuit, a wiring malfunction in the cabinet, or an input
circuit malfunction in the controller unit.

1.6 THEORY OF OPERATION

Reference designators shown are for Channel 1. Designators for channel 2 are shown in
brackets [ ].

1.6.1 SYSTEM DESCRIPTION

The sensor circuitry can be broken down into seven major blocks. Each "Input Circuit" block
contains the electrical transient devices and the input biasing circuit. Although the Model
242E has two DC inputs, a single digital processing section is used to process both inputs.
The microcontroller unit "MCU" Block provides the input voltage threshold and input pulse
width filtering function on both channel 1 and channel 2 DC input circuits.
Eberle Design Inc.
Model 242E
Operations Manual
Polarity Switch
OFF
ON
Filter A
Input
Open  Closed
Switch
OFF
10 ms
ON
100 ms
OFF
100 ms
ON
200 ms
OFF
10 ms
ON
10 ms
OFF
100 ms
ON
10 ms
Input
Output
True
True
False
False
True
False
False
True
Input
Closed  Open
10 ms
10ms
100 ms
10 ms
10 ms
100ms
100 ms
200 ms
Minimum Input
Pulse Width
Accept
10 ms
100 ms
100 ms
200 ms
10 ms
10 ms
100 ms
10 ms
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