Mitsubishi Electric MELSEC-Q Structured Programming Manual page 89

FXCPU Structured Programming Manual
[Device & Common]
3) In FX PLC
3S
Counter type
Software counter
C235, C236, C241
1-phase
C237, C238, C239,
1-counting
C240, C242, C243,
input
C244, C245
C246
1-phase
C247, C248,
2-counting
C248(OP), C249,
input
C250
C251
2-phase
C252, C253,
2-counting
C253(OP), C254,
input
C255
*1. Number of axes used in the following positioning instructions:
PLSY, PLSR, DSZR, ZRN, PLSV, DRVI, DRVA
• Calculation of the total frequency
The total frequency is calculated using the following expression:
Total frequency ≥ (Sum of frequency used by 1-phase counters) + (Sum of frequency
used by 2-phase counters)
• Calculation example
Example: When DHSCS, DHSCR or DHSZ 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
<Counter No.>
C235 (1-phase 1-counting) :
C236 (1-phase 1-counting) :
C237 (1-phase 1-counting) :
C253 (2-phase 2-counting) :
Overall frequency determined by condition of instructions used
Response
When DHSCS, DHSCR or DHSZ
frequency
instruction is not used
60kHz
10kHz
60kHz
200 kHz - (Number of positioned axes
10kHz
30kHz
5kHz
<Contents of use>
50 kHz is input.
50 kHz is input.
10 kHz is input.
5 kHz is input.
Total 115 kHz
When DHSCS, DHSCR or DHSZ
instruction is used
*1
× 40 kHz)
60 kHz - (Number of positioned axes
120 kHz (Overall frequency)
2 Devices in Detail
2.7 High Speed Counter [C]
*1
× 5 kHz)
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