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FX3G/FX3U/FX3UC Series Programmable Controllers
Programming Manual - Basic & Applied Instruction Edition
7 Basic Instruction
7.4 OR, ORI
7.4 OR, ORI
Outline
OR and ORI instructions are used to connect one contact in parallel.
If two or more contacts are connected in series, use ORB instruction described later to connect such a serial circuit
block to another circuit in parallel.
A step containing OR or ORI instruction is connected in parallel to a preceding step containing LD or LDI instruction.
There is no limitation in the number of times of parallel connection.
1. Instruction format
→ For the number of instruction steps, refer to Section 7.15.
2. Applicable devices
S1: Special auxiliary relays (M) and 32-bit counters (C) cannot be indexed with index registers (V and Z).
S2: State relays (S) cannot be indexed with index registers (V and Z).
S3: "D.b" is available only in FX
3U and FX3UC PLCs. However, index modifiers (V and Z) are not available.
S4: This function is supported only in FX
3U/FX3UC PLCs.
Explanation of function and operation
1. OR instruction (parallel connection of NO (normally open) contacts)
Instruc-
tion
Bit Devices Word Devices Others
System User Digit Specification System User
Special
Unit
Index
Con-
stant
Real
Number
Charac-
ter String
Pointer
XYMTCSD.b KnX KnY KnM KnS T C D R U\G VZModifyKH E ""P
OR 33
S
1
3
S
1
S
2
S3 S4
ORI 33
S
1
3
S
1
S
2
S3 S4
OR
OR
Basic Instruction
OR
−
Continuous
Operation
Pulse (Single)
Operation
Mnemonic Operation Condition
ORI
OR Inverse
Basic Instruction
ORI
−
Continuous
Operation
Pulse (Single)
Operation
Mnemonic Operation Condition
Timing chart
OR instruction
LD instruction
X000
Y000
X001
Circuit program
List program
LD
OR
OUT
0000
0001
0002
X000
X001
Y000
Y000
X001
X000
ON ON
ON
ON ON
ONON