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FX Series Programmable Controllers Devices in Detail 4
4-29
4.11.5 1 Phase Counters - User Start and Reset (C235 - C240)
These counters onl
y
use one input each.
When direction fla
g
M8235 is ON, counter
C235 counts down. When it is OFF, C235
counts up.
When X11 is ON, C235 resets to 0 (zero). All
contacts of the counter C235 are also reset.
When X12 is ON, C235 is selected. From the
previous counter tables, the correspondin
g
counted input for C235 is X0. C235 therefore
counts the number of times X0 switches from
OFF to ON.
Device specification:
• All of these counters are 32bit up/down rin
g
counters. Their countin
g
and contact
operations are the same as normal 32bit up/down counters described on pa
g
e 4-21.
When the counters current value reaches its maximum or settin
g
value, the counters
associated contacts are set and held when the counter is countin
g
upwards.
However, when the counter is countin
g
downwards the contacts are reset.
Setting range:
• -2,147,483,648 to +2,147,483,647
Direction setting:
• The countin
g
direction for 1 phase counters is dependent on their correspondin
g
fla
g
M8 ; where is the number of the correspondin
g
counter, (C235 to C240).
When M8 is ON the counter counts down,
When M8 is OFF the counter counts up.
Using the SPD instruction:
• Care should be taken when usin
g
the SPD applied instruction (FNC 56). This instruction
has both hi
g
h speed counter and interrupt characteristics, therefore input devices X0
throu
g
h X5 ma
y
be used as the source device for the SPD instruction. In common with
all hi
g
h speed processes the selected source device of the SPD instruction must not
coincide with an
y
other hi
g
h speed function which is operatin
g
, i.e. hi
g
h speed counters
or interrupts usin
g
the same input.
When the SPD instruction is used it is considered b
y
the s
y
stem to be a 1 phase hi
g
h
speed counter. This should be taken into account when summin
g
the maximum com-
bined input si
g
nal frequencies - see the previous section.
X12
K1234
C235RST
X10
X11
M8235
C235