Operation
■ Bits
Name
Symbol
Bit
No. of
Operation
Details
(See
note 1.)
addresses points
Input bits
I
I0 to Ib
12
12
8
Reflect the ON/OFF status of the input devices connected to the input
terminals on the CPU Unit.
(See note 2.)
---
Expansion input bits
Output bits
X
Q
Y
M
H
T
X0 to Xb
Reflect the ON/OFF status of the input devices connected to the input
terminals on the Expansion I/O Units.
Q0 to Q7
(See note 2.)
The ON/OFF status of these output bits is used to control the output devices
connected to the output terminals on the CPU Unit.
Expansion output bits
Work bits
Y0 to Yb
M0 to Mf
H0 to Hf
T0 to Tf
12
16
16
16
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.
1
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).
Holding bits
Timers
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.
X: ON-delay timer
Functions are
selected from the
screen when
parameter settings
are made.
Time units can be selected
from the following:
0.01-s unit: 0.01 to 99.99 s
min/s unit: 00 min 01 s to
99 min 59 s
■: OFF-delay timer
O: One-shot pulse
timer
2
h/s unit:
00 h 01 min to
99 h 59 min
F: Flashing pulse
timer
W: Twin timer
Holding timers
#
#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.
3
4
Counters
C
F
C0 to Cf
F0
16
1
Reversible 4-digit counters that can be incremented and decremented.
8-digit counter
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.
5
Weekly timers
(See note 3.)
@
*
@0 to @f
*0 to *f
16
16
16
4
Turn ON and OFF during specified times on specified days.
6
7
8
9
Calendar timers
(See note 3.)
Turn ON and OFF between specified dates.
Display bits
(See note 3.)
D
D0 to Df
A0 to A3
P0 to Pf
Display user-specified messages, times, timer/counter present values, or
analog-converted values.
Analog comparator bits A
Used as program input conditions to output analog comparator comparison
results. These bits can be used only for CPU Units with DC power supply.
Timer/counter
comparator bits
P
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.
10
8-digit counter
comparator bits
G
B
G0 to G3
B0 to B7
4
8
Used to compare the present values of 8-digit counters (F) and output the
comparison results.
11
12
Button input bits
(See note 3.)
Used as program input conditions and turn ON when operation buttons are
pressed in RUN Mode.
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
Set/Reset operation
A: Alternate
S: Set
R: Reset
I0
I1
I2
I3
[Q0
SQ1
RQ1
AQ2
I0
I1
I2
I3
Q0
Q1
Q1
Q2
Q0 will turn ON or OFF depending Q1 will stay ON once the execution Q1 is forced OFF when the
Q2 alternates between turning ON
and OFF when the execution
condition I3 turns ON.
on the ON/OFF status of the
execution condition I0.
condition I1 has turned ON once. A execution condition I2 is turned
reset is used to turn Q1 OFF. ON.
Programmable Relay ZEN V2 Units
19
OMRON [ OMRON ELECTRONICS LLC ]
