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10 Use of High-speed Counters
93
FX3S Series Programmable Controllers
User's Manual - Hardware Edition
1
Introduction
2
Features and
Part Names
3
Product
Introduction
4
Specifications
5
Version and
Peripheral
Devices
6
System
Configuration
7
Installation
8
Preparation and
Power Supply
Wiring
9
Input Wiring
10
High-Speed
Counters
10.7 Response Frequency and Overall Frequency
10.7 Response Frequency and Overall Frequency
1. Response frequency and overall frequency
When any of the following functions/instructions is used, the overall frequency is restricted without regard to
the operand of the instruction.
Consider this restriction when examining the system or creating programs, and observe the specified overall
frequency range.
• When two or more high-speed counters are used.
• When the HSCS instruction, HSCR instruction, HSZ instruction, PLSY instruction, PLSR instruction, DSZR
instruction, ZRN instruction, PLSV instruction, DRVI instruction or DRVA instruction is used.
*1. Number of axes used in the following positioning instructions:
PLSY (FNC 57), PLSR (FNC 59), DSZR (FNC150), ZRN (FNC156), PLSV (FNC157), DRVI
(FNC158), DRVA (FNC159)
2. Calculation of overall frequency
Obtain the overall frequency using the following expression:
Overall frequency [(Sum of used frequency of 1-phase counters) + (Sum of used frequency of 2-
phase counters)]
3. Example of calculation
Example 1:
When HSCS instruction, HSCR instruction or HSZ instruction is not used, and instructions related to
positioning (DRVI instruction [Y000] and DRVA instruction [Y001]) are used
Overall frequency : 200 kHz - (2 axes × 40 kHz) = 120 kHz
Example 2:
When HSCS instruction, HSCR instruction or HSZ instruction is used, and instructions related to positioning
(DRVI instruction [Y000]) is used
Overall frequency : 60 kHz - (1 axis × 5 kHz) = 55 kHz
High-speed counter type
Response
frequency
Overall frequency determined by condition of used instruction
When HSCS instruction, HSCR
instruction or HSZ instruction
is not used
When HSCS instruction, HSCR
instruction or HSZ instruction
is used
1-phase
1-count
input
C235, C236, C241 60 kHz
200 kHz -
Number of positioned axes
*1
× 40 kHz
60 kHz -
Number of positioned axes
*1
× 5 kHz
C237, C238, C239, C240,
C242, C243, C244, C245
10 kHz
1-phase
2-count
input
C246 60 kHz
C247, C248, C248 (OP),
C249, C250
10 kHz
2-phase
2-count
input
C251 30 kHz
C252, C253, C253 (OP),
C254, C255
5 kHz
<High-speed counter No.> <Contents of use>
C235 (1-phase 1-count input): 50 kHz is input.
C236 (1-phase 1-count input): 50 kHz is input.
C237 (1-phase 1-count input): 10 kHz is input.
C253 (2-phase 2-count input): 5 kHz is input.
Total 115 k Hz 120 kHz (Overall frequency)
<High-speed counter No.> <Contents of use>
C237 (1-phase 1-count input): 10 kHz is input.
C253 (2-phase 2-count input): 5 kHz is input.
Total 15 k Hz 55 kHz (Overall frequency)