Response Frequency And Overall Frequency - Mitsubishi Electric MELSEQ FX3S Series User Manual

FX Series Programmable Controllers
3S
User's Manual - Hardware Edition
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.
High-speed counter type
C235, C236, C241
1-phase
1-count
C237, C238, C239, C240,
input
C242, C243, C244, C245
C246
1-phase
2-count
C247, C248, C248 (OP),
input
C249, C250
C251
2-phase
2-count
C252, C253, C253 (OP),
input
C254, C255
*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
<High-speed 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):
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 No.>
C237 (1-phase 1-count input):
C253 (2-phase 2-count input):
Overall frequency determined by condition of used instruction
Response
When HSCS instruction, HSCR
frequency
instruction or HSZ instruction
is not used
60 kHz
10 kHz
60 kHz
200 kHz -
Number of positioned axes
10 kHz
30 kHz
5 kHz
<Contents of use>
50 kHz is input.
50 kHz is input.
10 kHz is input.
5 kHz is input.
Total 115 k Hz ≤ 120 kHz (Overall frequency)
<Contents of use>
10 kHz is input.
5 kHz is input.
Total 15 k Hz ≤ 55 kHz (Overall frequency)
10 Use of High-speed Counters
10.7 Response Frequency and Overall Frequency
When HSCS instruction, HSCR
instruction or HSZ instruction
is used
60 kHz -
*1
× 40 kHz Number of positioned axes
1
2
3
4
*1
× 5 kHz
5
6
7
8
9
10
93