Indicators and LEDs
The LED’s on the front panel allow you to quickly verify the operating status of the
module. The OK LED tells you the status of the backplane communication, and the STATUS LED
gives you information on the working state of the module itself.
OK LED
Solid Green - Module owned, two-way communication with PLC.
Blinking Green - PLC is in Program Mode, or one-way communication (module only sending
data).
Blinking Red - No communication between module and PLC.
Status 1 and Status 2 LEDS
(for resolver 1 and 2; Only the Status1 LED is present on the 1241)
Solid Green - Module and transducer are OK.
Blinking Green - Clearable transducer fault
Blinking Red - Non-clearable transducer fault
Solid Red - Module fault, such as no reference voltage
When the 1242 is configured for a dual-resolver transducer, only the STATUS 1 LED is used
to indicate the state of the transducer connection. Any problem with the module itself will
cause the STATUS 1 LED to turn on red. A problem with a transducer is indicated by blinking
the appropriate LED. When it blinks green, the transducer signals were temporarily lost but
the transducer is now working. This is most commonly caused by a loose connection or a burst
of electrical noise. If the LED blinks red, the transducer is not sending back correct
signals to the module. The most common causes of a non-clearable transducer fault are:
- Broken transducer cable
- Non-compatible transducer
- Improper wiring of the transducer cable
- Improper transducer cable installation
- Faulty transducer
- Faulty module
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