Response Frequency And Overall Frequency - Mitsubishi FX3G SERIES User Manual

FX Series Programmable Controllers
3G
User's Manual - Hardware Edition
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.
Counter type
C235, C236, C238,
C239, C241
1-phase 1-
count input
C237, C240, C242,
C243, C244, C245
C246, C248(OP)
1-phase 2-
C247, C248, C249,
count input
C250
C251, C253(OP)
2-phase 2-
C252, C253, C254,
count input
C254(OP), C255
*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
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
<Counter No.>
C235(1-phase 1-count input):
C236(1-phase 1-count input):
C237(1-phase 1-count input):
C253(2-phase 2-count input):
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 No.>
C235(1-phase 1-counting):
C236(1-phase 1-counting):
Overall frequency determined by condition of used instruction
Response
When HSCS, HSCR or HSZ
Frequency
instruction is not used
60kHz
10kHz
60kHz
- (Number of positioned axes
+ Number of pulse width/cycle
10kHz
measurement inputs) x 40kHz
30kHz
5kHz
[(Sum of used frequency of 1-phase counters) + (Sum of used frequency of 2-
Total
Total
11.7 Response Frequency and Overall Frequency
200kHz
*1
x 5kHz) - (Number of pulse width/cycle
<Contents of use>
50kHz is input.
50kHz is input.
10kHz is input.
5kHz is input.
115kHz 120kHz (Overall frequency)
<Contents of use>
50kHz is input.
50kHz is input.
100kHz 120kHz (Overall frequency)
11 Use of High-speed Counters
When HSCS, HSCR or HSZ
instruction is used
60kHz
*1
- (Number of positioned axes
measurement inputs x 20kHz)
137
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