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5. PULSE INPUT AND COUNTING METHOD
5.1 1-phase pulse input
In 1-phase pulse input, multiplication by one or two can be selected for counting.
(1) Relationship between phase A pulse input and down count command
The following diagram shows the relationship between phase A pulse input and
down count command.
Encoder
Down count command
{or RY(n+1)3 (RY(n+1)A) on}
(2) Counting mode setting
To use this counting mode, set the following value to the lower 8 bits of the remote
register {address RWwm+2 (RWwm+A)} using the sequence program.
When the value set is not the following set value, the initial value (1-phase
multiplication by one) is set.
Counting Mode
1-phase multiplication by one
1-phase multiplication by two
Address
15
RWwm+2(CH1)
0
0
0
RWwm+A(CH2)
External output hold/clear setting
0: Clear
1: Hold
(Refer to Appendix 1)
[Sequence program example]
• Counting in 1-phase, multiplied-by-two mode
Write command
×
: First I/O number of master module
◎
: Corresponding station register address of master module buffer memory
POINT
Exercise care when setting the pulse input mode, since the upper 8 bits are used
for the counter function selection register and external output hold/clear setting.
Pulse input
To A
To B
Set Value
00
H
01
H
Set in hexadecimal.
4 bits
8 bits
Counter function
Pulse input mode register
selection register
(Refer to Chapter 9)
MOV
H0001
×
◎
TO
H
H
D0
5 - 2
MELSEC-A
High-speed counter module
0
D0
K1
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