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Operation
■ Bits
Name
Symbol
Input bits
I
Expansion input bits
X
Output bits
Q
Expansion output bits
Y
Work bits
M
Holding bits
H
Timers
T
Holding timers
#
Counters
C
8-digit counter
F
Weekly timers
@
(See note 3.)
*
Calendar timers
(See note 3.)
Display bits
D
(See note 3.)
Analog comparator bits A
Timer/counter
P
comparator bits
8-digit counter
G
comparator bits
Button input bits
B
(See note 3.)
Note: 1. For details, refer to the indicated item numbers on the following pages.
2. CPU Units with 10 I/O points have 6 input bits (I0 to I5) and 4 output bits (Q0 to Q3). Output bit Q3 of Communications-type CPU Units,
however, cannot be output externally. It can be used as a work bit.
3. These input bits are not supported by LED-type CPU Units without display.
1.
Additional Bit Output Functions
[: Normal
I0
[Q0
I0
Q0
Q0 will turn ON or OFF depending
on the ON/OFF status of the
execution condition I0.
Bit
No. of
addresses
points
I0 to Ib
12
Reflect the ON/OFF status of the input devices connected to the input
(See note 2.)
terminals on the CPU Unit.
X0 to Xb
12
Reflect the ON/OFF status of the input devices connected to the input
terminals on the Expansion I/O Units.
Q0 to Q7
8
The ON/OFF status of these output bits is used to control the output devices
(See note 2.)
connected to the output terminals on the CPU Unit.
Y0 to Yb
12
The ON/OFF status of these output bits is used to control the output devices
connected to the output terminals on the Expansion I/O Units.
M0 to Mf
16
Work bits can be used only within the ZEN program. I/Os for external devices
cannot be made (i.e., all I/O is internal).
H0 to Hf
16
Used the same as the work bits. However, if the power to the ZEN is turned
OFF, these bits also maintain the previous ON/OFF status.
T0 to Tf
16
X: ON-delay timer
■: OFF-delay timer
O: One-shot pulse
timer
F: Flashing pulse
timer
W: Twin timer
#0 to #7
8
Hold the present value being counted even if the trigger input or power supply
is turned OFF and continue timing when the trigger input or power is restored.
C0 to Cf
16
Reversible 4-digit counters that can be incremented and decremented.
F0
1
Reversible 8-digit counters that can be incremented and decremented.
CPU Units with DC power supply support a high-speed counter up to 150 Hz.
For details, refer to 8-digit Counter Operation on page 21.
@0 to @f
16
Turn ON and OFF during specified times on specified days.
*0 to *f
16
Turn ON and OFF between specified dates.
D0 to Df
16
Display user-specified messages, times, timer/counter present values, or
analog-converted values.
A0 to A3
4
Used as program input conditions to output analog comparator comparison
results. These bits can be used only for CPU Units with DC power supply.
P0 to Pf
16
Compare the present values of timers (T), holding timers (#), and counters
(C). Comparison can be made between the same two counters or timers, or
with constants.
G0 to G3
4
Used to compare the present values of 8-digit counters (F) and output the
comparison results.
B0 to B7
8
Used as program input conditions and turn ON when operation buttons are
pressed in RUN Mode.
Set/Reset operation
S: Set
I1
SQ1
I1
Q1
Q1 will stay ON once the execution
condition I1 has turned ON once. A
reset is used to turn Q1 OFF.
Operation
Functions are
Time units can be selected
selected from the
from the following:
screen when
0.01-s unit: 0.01 to 99.99 s
parameter settings
min/s unit: 00 min 01 s to
are made.
h/s unit:
R: Reset
I2
RQ1
I2
Q1
Q1 is forced OFF when the
execution condition I2 is turned
ON.
ZEN V2 Units
Details
(See
note 1.)
---
1
2
99 min 59 s
00 h 01 min to
99 h 59 min
3
4
5
6
7
8
9
10
11
12
A: Alternate
I3
AQ2
I3
Q2
Q2 alternates between turning ON
and OFF when the execution
condition I3 turns ON.
19
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