352
FX3G/FX3U/FX3GC/FX3UC Series
Programming Manual - Basic & Applied Instruction Edition
13 High-Speed Processing – FNC 50 to FNC 59
13.6 FNC 55 – HSZ / High-Speed Counter Zone Compare
13.6 FNC 55 – HSZ / High-Speed Counter Zone Compare
Outline
This instruction compares the current value of a high-speed counter with two values (one zone), and outputs the
comparison result to three bit devices (refresh).
→ For the table high-speed comparison mode, refer to Subsection 13.6.2.
→ For the frequency control mode, refer to Subsection 13.6.3.
1. Instruction format
2. Set data
3. Applicable devices
S1: "D.b" is available only in FX3U and FX3UC PLCs. However, index modifiers (V and Z) are not available.
S2: This function is supported only in FX3U/FX3UC PLCs.
Explanation of function and operation
1. 32-bit operation (DHSZ)
The current value of a high-speed counter (C235 to C255) specified in is compared with two comparison points
(comparison value 1 and comparison value 2). Based on the comparison result, "smaller than the lower comparison
value", "inside the comparison zone" or "larger than the upper comparison value", one among , +1 and
+2 is set to ON regardless of the operation cycle.
In this instruction, the comparison processing is executed after the count processing in the high-speed counter.
Operand Type Description Data Type
Data to be compared with the current value of a high-speed counter or word device
number storing data to be compared (comparison value 1)
32-bit binary
Data to be compared with the current value of a high-speed counter or word device
number storing data to be compared (comparison value 2)
32-bit binary
Device number of a high-speed counter [C235 to C255] 32-bit binary
Head bit device number to which the comparison result is output based on upper and
lower comparison values
Bit
Oper-
and
Type
Bit Devices Word Devices Others
System User Digit Specification System User
Special
Unit
Index Constant
Real
Number
Charac-
ter String
Pointer
XYMTCSD
.b KnX KnY KnM KnS T C D R
U\G
VZModify K H E "
"P
33333333
S2
33 33
33333333
S2
33 33
33
33 3
S
1
3
Mnemonic Operation Condition
32-bit Instruction
17 steps DHSZ
Continuous
Operation
16-bit Instruction
Mnemonic Operation Condition
−
FNC 55
HSZ
D
S
1
S
2
S
D
S
1
S
2
S
D
S
D
D
D
→
Set to ON.
Comparison
value 2
Comparison
source
Output
destination
S
1
FNC 55
DHSZ
K2,147,483,647
>
+1
+2
S
Comparison
value 1
S
1
D
S
2
S
S
S
1
S
S
S
2
S
2
D
D
D
→
→
≤≤
>
Command
input
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