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MELSEC-Q/QnA
5 SEQUENCE INSTRUCTIONS
AND, ANI
(1) AND is the A contact series connection instruction, and ANI is the B contact series connection
instruction. They read the ON/OFF data of the designated bit device (if a bit designation has
been made for a word device, the 1/0 status of the designated bit is read), perform an AND
operation on that data and the operation result to that point, and take this value as the
operation result.
(2) There are no restrictions on the use of AND or ANI, but the following applies with a peripheral
device used in the ladder mode:
(a) Write............When AND and ANI are connected in series, a ladder with up to 21 stages
can be generated.
(b) Read ...........When AND and ANI are connected in series, a ladder with up to 24 stages
can be displayed.
If the number exceeds 24 stages, up to 24 will be displayed.
OR, ORI
(1) OR is the A contact single parallel connection instruction, and ORI is the B contact single
parallel connection instruction. They read ON/OFF information from the designated device (if a
word device bit has been designated, this becomes the 1/0 status of the designated bit), and
perform an OR operation with the operation results to that point, and use the resulting value as
the operation result.
(2) There are no limits on the use of OR or ORI, but the following applies with a peripheral device
used in the ladder mode.
(a) Write................OR and ORI can be used to create connections of up to 23 ladders.
(b) Read................Up to 23 ladders connected with OR or ORI can be displayed.
The 24th or subsequent ladders cannot be displayed properly.
REMARK
Word device bit designations are made in hexadecimal
Bit b11 of D0 would be D0.0B.
See Section 3.2.1 for more information on word device bit designation.
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