39
Switch input operation
If switch contacts are used for this Pulse Input (terminals 1 & 2), then and parallel resistors
must be fitted - see Section 6.1.2 for recommended values.
Simple or Legacy mode - SW4 - OFF
If simple “pulse-in/pulse-out” operation is required or, if a replacement for the earlier MTL5032
pulse isolator is required, then SW4 should be set to OFF. The input switching point voltage
(Vsp) thresholds can then be defined by Switches 1 & 2, and the LFD operation can be set with
Switch 3. When Switch 3 is ON, the Alarm output (terminals 11 & 12) become active.
Configurable mode - SW4 - ON
In this mode, analogue, alarm and pulse outputs are available but the module must be software
configured to define its operating mode. In this mode, software controls the LFD function and
Switch 3 has no effect. Switches 1 & 2 continue to define the switching point threshold (Vsp).
Configuration requires a personal computer, a PCL45USB interface and PCS45 software. See
Section 6.9 for details of the configurator.
Alarm inhibiting
The Inhibit input is provided to inhibit alarm output operation. This facility is useful, for example,
during power-up, when pulse rates are below the alarm threshold. When normal operational
values are established the inhibit can be disabled. Such a facility is sometimes referred to
as a start-up delay. Inhibit is enabled by connecting a switch or proximity detector between
terminals 6 and 3. If switch contacts are used for this input, then and parallel resistors must be
fitted - see Section 6.1.2 for recommended values.
LED indicators
Use the following LED information to understand the module status.
LED Description
PWR
Power (green)
ON - Power OK OFF - No power or insufficient voltage
O/P
Output (yellow)
The LED will follow the pulse output state. If the output is pulsing then
the LED brightness will pulse. If the pulsing is rapid or very short, the LED
may dim if it is unable to respond to such changes.
If the output is high, the LED will be ON.
STS
Status
(red - flashing)
In legacy mode a line fault will cause the LED to turn ON.
In mC mode, the LED is programmable to display a line fault or an Alarm
trip operation. In the event, it will also indicate a mC fault condition.
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