Mitsubishi Electric MELSEC FX3U Programming Manual page 200

FX /FX /FX Series Programmable Controllers
3G 3U 3UC
Programming Manual - Basic & Applied Instruction Edition
2. ORI instruction (parallel connection of NC (normally closed) contacts)
Circuit program
X000
X002
Timing chart
LD instruction
ORI instruction
3. Relationship with ANB instruction
LD
OR
OR
OR
*1
4. Indexing
Devices used in OR and ORI instruction can be indexed with index registers (V and Z).
(State relays (S), special auxiliary relays (M), 32-bit counters, and "D .b" cannot be indexed.)
Circuit program
X000
X001V0
*1. This function is supported only in FX
198
List program
Y001
ON
X000
ON ON
X002
ON ON
Y001
ANB
LD
OR
Before ANB
instruction
After ANB instruction
List program
0000
0001
Y000
0004
0000 LD X000
0001 ORI X002
0002 OUT Y001
ON
ON
ON
The parallel connection by OR or ORI
instruction is connected to the preceding LD
or LDI instruction in principle.
instruction, however, the parallel connection
by OR or ORI instruction is connected to the
second preceding LD or LDI instruction.
The index registers V0 to V7 and Z0 to Z7 are
available for indexing.
When a used device is an input (X) or output
(Y), the value of an index register (V or Z) is
LD X000
converted into an octal number, and then
OR X001V0
added.
OUT Y000
Example:When the value of V0 is "10", OR
/FX PLCs.
3U 3UC
7 Basic Instruction
contact is set to ON (becomes
conductive) or OFF (becomes non-
conductive) by X013.
7.4 OR, ORI
After ANB