1 . M P U U n i ts
MN05003006E For more informat ion visit :
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3. For additional information concerning error codes (in D1004), see the “ELC Programming
Manual.
“Input” indicator
There is an LED indicator for each input. If the LED is not ON when the input device is ON,
check the input status using the programming software. If the input status also indicates the
input is Off, check the following:.
1. Check the wiring of the input devices.
Check that power is properly supplied to the input terminals and that the input device is
properly wired to the input.
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At this point, if the power is properly supplied to the input terminal and the wiring is proper,
there is probably a problem with the ELC’s input circuit.
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If power is not present at the input circuit, there is most likely a problem with the input
device or the power source. C
2. Check the input condition if the input LED is ON when the input device is OFF.
Monitor the input condition using the programming software.
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If the input status is OFF, but the input LED is ON there is probably a problem with the
ELC’s input circuit.
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If the input status is ON, but the LED is OFF, check the leakage current at the input
device. There could also be a problem with the input circuit.
“Output” indicator
Output LED indicates if the output signals are turned On or Off by the program. Check the
following when the LED On/Off indication does not correspond to the program:
1. Check that the output is not used in the program in multiple locations. The outputs states
are written to the actual outputs at the end of each program scan. Therefore, the last
occurrence of each output in the program determines whether it is turned On or Off at the
terminal. It is recommended that all logic controlling each physical output be placed on a
single rung with that output rather than using a particular output multiple times in the
program.
2. Check the wiring and verify that the screws are tight.
3. Check the voltage at the output terminals and at the load to determine if the output circuit
or the load are the problem.
“RS-232, RS-485” indicators (ELC-PC/PA/PH/PV)
“RS-232” LED will flash when the RS232 port is receiving data. The “RS-485” LED will flash
when the RS-485 port is transferring data.
“A
D” indicator (ELC-PA)
The A
D LED indicator will blink if the PA controller is running.
“ALARM” indicator (ELC-PA)
The “ALARM” LED will blink if AD/DA conversion data exceeds its range when the PA controller
