Calculation Of Response Frequency And Overall Frequency; Response Frequencies Of Hardware Counters; Response Frequencies And Overall Frequency Of Software Counters - Mitsubishi FX3U SERIES User Manual

FX Series Programmable Controllers
3U
User's Manual - Hardware Edition
11.9

Calculation of Response Frequency and Overall Frequency

11.9.1 Response frequencies of hardware counters

The maximum response frequencies of the hardware counters are shown in the following table.
Depending on the working conditions, the maximum response frequencies of hardware counters are the
same as those of the software counters, and limitations on overall frequency are set up.
→ For the conditions under which the hardware counters are handled as software counters,
Counter type
1-phase 1-count input
1-phase 2-count input
2-phase 2-count
input

11.9.2 Response frequencies and overall frequency of software counters

The maximum response frequencies and overall frequency of software counters are shown below.
When HSZ or HSCT instruction is used in the program, limitations are put on the maximum response
frequencies and overall frequency of all software counters regardless of the instruction operand.
When examining the system or creating the program, use the counters within the maximum response
frequency and overall frequency ranges suitable to the conditions in consideration of the limitations.
1. When FX Series special function units/blocks and analog special adapters are not used
3U
Examples of calculation are given in the heavy-line frame.
Software
counters
with
HSCS,
Counter
Counter type HSCR,
Nos.
HSZ or
HSCT
instruc-
tion
C235,
C241,
C236,
C242,
C237,
C243,
C238,
1-phase
C244,
C239,
1-count input
C245
C240
C244(OP),
−
C245(OP)
C247,
1-phase C248, C246,
2-count input C249, C248(OP)
C250
1 edge
2- count C252,
phase C253
C251,
2- (OP),
C253
4 edge
count C254,
count
input C255
*1. When an index register is added to a counter number specified by HSCS, HSCR, HSZ or HSCT
instruction, all hardware counters are switched to software counters.
*2. The high-speed counters C244(OP) and C245(OP) cannot count signals of 10kHz or more.
Counter Nos.
C235,C236,C237,C238,C239,C240
C244(OP),C245(OP)
C246,C248(OP)
1 edge count
C251,C253
4 edge count
Magni-
fication
for
Neither HSZ nor
calcu-
HSCT instruction
lation
Max.
of
Overall
response
overall
frequency
frequency
frequ-
(kHz)
(kHz)
*1 ency
×
40
1
×
10
1
80
×
1 40
×
1 40
×
10
4
11 Use of High-speed Counters (C235 to C255)
11.9 Calculation of Response Frequency and Overall Frequency
Response frequency and overall frequency depending
on conditions of instruction to be used
Only HSCT
Only HSZ instruction
instruction
Max.
Overall
response response
frequency
frequency frequency
(kHz)
(kHz) (kHz)
30
(number of
10
instruc-
60
30
30
number of
7.5
instruc-
tion) / 4
refer to the previous page.
Max. response frequency
Main unit FX -4HSX-ADP
3U
100kHz
10kHz 200kHz
100kHz
50kHz 100kHz
50kHz 100kHz
Both HSZ and HSCT
instructions
Max. Max.
Overall
response
frequency
frequency
(kHz)
(kHz)
40 - 30 -
(number of
instruc-
×
80 - 1.5
tion) tion)
(number of
*2 *2
instruc-
tion)
(40 - (30 -
number of
instruc-
tion) / 4
11
12
13
14
15
16
Overall
frequency
(kHz)
17
18
×
60 - 1.5
(number of
instruc-
tion)
19
20
195