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6
6.1 _Preliminary checks
I.
Check whether the input wiring and/or extension cables are properly connected on FX
block
II.
Check that the FX
2N
does not exceed 8 and the total system I/O is equal or less than 256 I/O.
III. Ensure that the correct operating range has been selected for the application.
IV. Check that there is no power overload on either the 5V or 24V power sources, remember the loading on a FX
main unit or a powered extension unit varies according to the number of extension blocks or special function
blocks connected.
V.
Put the FX
main unit into RUN.
2N
6.2 Error checking
If the FX
-4AD special function block does not seem to operate normally, check the following items.
2N
•
Check the status of the POWER LED.
Lit
: The extension cable is properly connected.
Otherwise : Check the connection of the extension cable.
•
Check the external wiring.
•
Check the status fo the "24V" LED (top right corner of the FX
Lit
: FX
2N
Otherwise : Possible 24VDC power failure, if OK possible FX
•
Check the status fo the "A/D" LED (top right corner of the FX
Lit
: A/D conversion is proceeding normally.
Otherwise : Check buffer memory #29 (error status). If any bits (b2 and b3) are ON, then this is why
the A/D LED is OFF.
Guidelines for the safety of the user and protection of the FX
• This manual has been written to be used by trained and competent personnel. This is defined by
the European directives for machinery, low voltage and EMC.
• If in doubt at any stage during the installation of the FX
electrical engineer who is qualified and trained to the local and national standards. If in doubt
about the operation or use of the FX
distributor.
• Under no circumstances will Mitsubishi Electric be liable or responsible for any consequential
damage that may arise as a result of the installation or use of this equipment.
• All examples and diagrams shown in this manual are intended only as an aid to understanding
the text, not to guarantee operation. Mitsubishi Electric will accept no responsibility for actual
use of the product based on these illustrative examples.
JY992D65201A
system configuration rules have not been broken, i.e. the number of special function blocks
-4AD is OK, 24V DC power source is OK.
Manual number
Manual revision
Date
HEAD OFFICE:MITSUBISHI DENKI BLDG MARUNOUCHI TOKYO 100 TELEX:J24532 CABLE MELCO TOKYO
HIMEJI WORKS:840, CHIYODA CHO, HIMEJI, JAPAN
DIAGNOSTICS
-4AD).
2N
-4AD failure.
2N
-4AD).
2N
-24AD always consult a professional
2N
-4AD please consult the nearest Mitsubishi Electric
2N
: JY992D65201
: A
: JUNE 1997
-4AD analog special function
2N
-4AD special function block
2N
Effective JUN. 1997
Specifications are subject to
change without notice
2N
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