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FX Series Programmable Controllers Devices in Detail 4
4-25
4.11.3 Availability of High Speed Counters
on FX, FX
2C
PLC’s
The followin
g
device table outlines the ran
g
e of available hi
g
h speed counters on both the FX,
FX
2C
.
Ke
y
:
U
- up counter input
D
- down counter input
R
- reset counter (input)
S
- start counter (input)
A
- A phase counter input
B
- B phase counter input
- Counter is backed up / latched
Input assignment:
• X6 and X7 are also hi
g
h speed inputs, but function onl
y
as start si
g
nals. The
y
cannot be
used as the counted inputs for hi
g
h speed counters.
• Different t
y
pes of counters can be used at the same time but their inputs must not coin-
cide. For example, if counter C247 is used, then the followin
g
counters and instructions
cannot be used;
C235, C236, C237, C241, C242, C244, C245, C246, C249, C251, C252, C254, I0 ,
I1 , I2 .
• The inputs marked are 7 kHz inputs, while those marked are 10 kHz inputs.
I
N
P
U
T
1 Phase counter
user start/reset
1 Phase counter
assigned
start/reset
2 Phase counter
bi-directional
A/B Phase counter
C235 C236 C237 C238 C239 C240 C241 C242 C243 C244 C245 C246 C247 C248 C249 C250 C251 C252 C253 C254 C255
X0
U/D U/D U/D U U U A A A
X1
p
U/D R RDDDBBB
X2
U/D U/D U/D R R R R
X3
U/D R S R U S U A A
X4
p
U/D U/D D D B B
X5
p
U/D R RR RR
X6
SSS
X7
SSS
C235