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11 Use of High-speed Counters
11.7 Response Frequency and Overall Frequency
167
FX3G Series Programmable Controllers
User's Manual - Hardware Edition
11
High-Speed
Counters
12
Output Wiring
13
Wiring for
Various Uses
14
Test Run,
Maintenance,
Troubleshooting
15
Input/Output
Powered
Extension Units
16
Input/Output
Extension
Blocks
17
Extension
Power Supply
Unit
18
Other Extension
Units and
Options
19
Display Module
20
Terminal Block
11.7 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, HSCR, HSZ, PLSY, PLSR, DSZR, TBL, ZRN, PLSV, DRVI or DRVA instruction is used.
• When the pulse width/cycle measurement function is used.
*1. Number of axes used in the following positioning instructions:
PLSY(FNC57), PLSR(FNC59), DSZR(FNC150), TBL(FNC152), 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
Example1:
When HSCS, HSCR or HSZ instruction is not used, and instructions related to positioning (DRVI instruction
[Y000] and DRVA instruction [Y001]) are used
Overall frequency : 200kHz - (2 axes x 40kHz) = 120kHz
Example2:
When HSCS, HSCR or HSZ instruction is not used, and instructions related to positioning (DRVI instruction
[Y000]) are used, Number of pulse width/cycle measurement inputs(X003)
Overall frequency : 200 kHz - [(1 axes + 1 input) x 40 kHz] = 120 kHz
Counter type
Response
Frequency
Overall frequency determined by condition of used instruction
When HSCS, HSCR or HSZ
instruction is not used
When HSCS, HSCR or HSZ
instruction is used
1-phase 1-
count input
C235, C236, C238,
C239, C241
60kHz
200kHz
- (Number of positioned axes
*1
+ Number of pulse width/cycle
measurement inputs) x 40kHz
60kHz
- (Number of positioned axes
*1
x 5kHz) - (Number of pulse width/cycle
measurement inputs x 20kHz)
C237, C240, C242,
C243, C244, C245
10kHz
1-phase 2-
count input
C246, C248(OP) 60kHz
C247, C248, C249,
C250
10kHz
2-phase 2-
count input
C251, C253(OP) 30kHz
C252, C253, C254,
C254(OP), C255
5kHz
<Counter No.> <Contents of use>
C235(1-phase 1-count input): 50kHz is input.
C236(1-phase 1-count input): 50kHz is input.
C237(1-phase 1-count input): 10kHz is input.
C253(2-phase 2-count input): 5kHz is input.
Total
115kHz 120kHz (Overall frequency)
<Counter No.> <Contents of use>
C235(1-phase 1-counting): 50kHz is input.
C236(1-phase 1-counting): 50kHz is input.
Total
100kHz 120kHz (Overall frequency)