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TV check error

Article Id: #22     Viewed: 2838 times     Last updated on: 21 Oct 2011     Article Category: NCnet    

NATURE OF PROBLEM
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'TV check' error occurs when reading a program into the machine through DNC or flash card.


SOLUTION
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Set 'TV check' OFF in the Setting page. It is irrelevant, is relevant only when using punched tapes


FULL EXPLANATION
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TV (Tape Vertical) parity check
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If you wanted to make a program that would pass the TV parity check, you must be sure that every block of the program has an EVEN number of characters. For example, if the block has an even number of characters, like:
G00G90X.5000 (12 characters)
...then you won't get a TV alarm when you read it in.

If the block has an odd number of characters, like: G00G90X-.5000 (13 characters)
..then you must add a "space" character to the block so that it has 14 characters, and even number.

The programs that a Fanuc sends back to your PC always has an even number of characters. The odd numbered blocks will have the extra space at the end.

TV parity is seldom used, and it's usually turned off on the "Setting" screen as previous posts have mentioned.

TH (Tape Horizontal)parity check
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The TH alarm is generated when a wrong CHARACTER parity is read by the CNC. TH parity refers to the number of hole ACROSS a paper tape or (when downloading electronically) the number of binary bits in each character. Fanuc controls require even parity when reading ISO tapes (ASCII even parity) and odd parity when reading the old EIA tapes. Unlike TV parity checking, TH parity checking can not be turned off on a Fanuc. A TH alarm means that you have an illegal character in your program, or a problem with the RS232 transmission.

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