Omron ZEN V2 - User manual

Programmable Relay ZEN V2 Units 1
Programmable Relay
ZEN V2 Units
Please read and understand this catalog before purchasing the
products. Please consult your OMRON representative if you have any
questions or comments. Refer to “Warranty and Application
Considerations” on page 36, and “Precautions for Safe Use” on page 34.
Even Broader Applications with Increased
Functionality and Higher Precision
• Increased functionality in a compact body (70 mm wide ×90 mm
high).
• Easy programming is available using the LCD and operation
buttons. (See note 1.)
• This single Unit easily provides relay, timer, counter, and time
switch functions.
• Expansion is easy with Expansion I/O Units, allowing up to 44
I/O points. (See note 2.)
• Economy-type and Communications-type CPU Units have been
added to series.
• Improved Weekly Timers (See note 1.)
Increased timing accuracy with a monthly deviation of ±15 s
max. Multiple-day operation and pulse output operation have
been added.
• Select from two power supply options:
100 to 240 VAC or 12 to 24 VDC.
Note: 1. Not supported for ZEN-@C2@@-@-V2 models.
2. When using CPU Units with 20 I/O points.
The information in this document applies to V2 Units.
Refer to page 28 for details on differences with previous
products.
Features
■Easy and Simple Programming for Automatic Small-scale Control
Saves Space, Wiring, and Installation Steps
•Versatile functionality in a compact body (70 mm wide ×90 mm
high).
•This single Unit easily provides relay, timer, counter, and time
switch functions. Wiring work is greatly reduced because separate
wiring is not required for devices such as timers and counters.
Easy Programming
The LCD screen comes with 8 operation buttons on the front panel to
enable programming in ladder view format. The LCD screen also has
a backlight, making it easier to see when the ZEN is used in dark
locations.
Note: Not supported for ZEN-@C2@@-@-V2 models.
90 mm
70 mm

2Programmable Relay ZEN V2 Units
Flexible Expansion Enables Up to 44 I/O
Points
Up to three Expansion I/O Units can be connected if there are not
enough I/O points. Expansion I/O Units are only 35 mm wide.
Note: CPU Units with 10 I/O points can be expanded to 34 I/O points.
Expansion I/O Units cannot be connected to Economy-type
CPU Units.
Support Software with Simulation Function
•Programs can be easily written, saved, and monitored by personal
computer.
•Programs can be simulated on the personal computer without
connecting to the ZEN.
Note: For notebook computers that do not have an RS-232C serial
port, connect the computer to the ZEN by connecting an
OMRON CS1W-CIF31 USB-Serial Conversion Cable to the
ZEN-CIF01 Connecting Cable.
Other Versatile Functions
•Use of a Memory Cassette makes it easy to copy and save
programs.
•Equipped with two analog input channels (CPU Units with DC
power supply only).
•Password function ensures security. (See note.)
•Multi-language display in six languages (English, Japanese,
German, French, Spanish, Italian). (See note.)
•Display user-set messages or analog-converted values. (See note.)
Note: Not supported for ZEN-@C2@@-@-V2 models.
■Enhanced Features of V2 CPU Units
Improved Weekly Timer and Calendar Timer
Functions
Note: Not supported for ZEN-@C2@@-@-V2 models.
•The time precision has been increased.
Conventional model: 2-min difference/month
↓
-V2 models: ±15-s difference/month (at 25°C)
•Multiple-day operation and pulse-output operation are now
possible.
•These improved functions are convenient for time-controlled
applications such as lighting and air conditioning control.
Economy-type Added to the Series
•Economy-type CPU Units with a more affordable price have been
added to the series, although Expansion I/O Units cannot be
added.
12 to 24 VDC Line Voltage Operation
Operation is now possible with 12 VDC.
Expansion I/O Units have been reduced to
half-size (35 mm wide).
RS-485 Communications Model Added to
Series
Production line conditions can be remotely monitored by monitoring
the ZEN control status.
More Precise Analog Input
Conventional model: ±10% FS →-V2 models: ±1.5% FS
DC power supply models are equipped with two analog inputs (0 to
10 V). There are four analog comparators. The increased precision
makes it even easier to use the Unit in simple control applications
with voltage, current, temperature, and other analog values.
8-digit Counter, 150-Hz Counter
•An 8-digit counter and 8-digit comparator have been added.
•The maximum count for DC power supply models is 150 Hz.
Twin-timer Operation Added
Twin-timer operation allows you to set ON and OFF times separately,
greatly simplifying intermittent operation.
Lighting control Air conditioning control
Office
Production line

Programmable Relay ZEN V2 Units 3
■Series Configuration
CPU Units
Power supply voltage: 100 to 240 VAC, 12 to 24 VDC, Output: Relay, transistor output
With LCD display, operation buttons, and calendar/clock function LED type
10 I/O points
Standard LCD type Economy type Standard LCD type Economy type
Communications type
20 I/O points 10 I/O points 20 I/O points
ZEN-10C1@ZEN-10C3@ZEN-10C4@ZEN-20C1@ZEN-20C3@
ZEN-10C2@
(10 I/O points)
ZEN-20C2@
This CPU Unit has no LCD,
operation buttons, or
calendar/clock function.
Expansion I/O Units
cannot be connected.
Expansion I/O Units
cannot be connected.
RS-485 communications
type.
E
xpans
i
on
I/O
U
n
i
ts
Only 35-mm wide.
4 input, 4 output points
P
ower
S
upp
l
y
U
n
i
t
Same shape and design as ZEN.
24 VDC, 30 W
S
upport
S
o
f
tware
Allows easy programming and
operation simulation.

4Programmable Relay ZEN V2 Units
Model Number Structure
■Model Number Legend
Note: This model number legend includes combinations that are not available.
Please check “List of Models” for availability.
CPU Units
1. Number of I/O points
10: 6 inputs and 4 outputs (See note.)
20: 12 inputs and 8 outputs
2. Type classifier
1: Standard LCD type with display
2: LED type without display
3: Economy type with display
(Expansion I/O Units cannot be connected.)
4: Communications type with display
3. Input type
A: AC input
D: DC input
4. Output type
R: Relay
T: Transistor
5. Supply voltage
A: AC power supply
D: DC power supply
Note: The Communications-type CPU Unit has 6 inputs and 3 outputs.
Expansion I/O Units
1. Number of I/O points
8: 4 inputs and 4 outputs
2. Unit version classifier
E1: Can connect to V2 CPU Units (See note.)
3. Input type
A: AC input
D: DC input
4. Output type
R: Relay
T: Transistor
Note: Use a ZEN-8E@@/-4E@ to connect to pre-V1 and V1 CPU Units.
ZEN-@C@@@-@-V2
1234 5
ZEN-8E1@@
1234
This data sheet is provided as a guideline for selecting products. Be sure to refer to the following user manuals for application precautions
and other information required for operation before attempting to use the product.
ZEN Operation Manual (Cat. No. Z211)
ZEN Communications Manual (Cat. No. Z212)
ZEN Support Software Operation Manual (Cat. No. Z184-E1-03)
The PDF versions of these manuals can be downloaded from the following website.
ZEN Website http://www.zen.omron.co.jp/eng/index.html

Programmable Relay ZEN V2 Units 5
Ordering Information
■List of Models
CPU Units and Expansion I/O Units
Note: 1. Programming is not possible using only the CPU in the LED-type CPU Unit. ZEN Support Software or a Memory Cassette is required.
2. Cannot be connected to pre-V1 and V1 CPU Units.
3. The ZEN-8E1AR cannot be connected to a CPU Unit with DC power supply.
Power Supply Unit
Note: Refer to the ZEN-PA03024 Datasheet (Cat. No. L103) for detailed specifications.
Unit Name No. of
I/O
points
LCD
display
Power supply
voltage
Inputs Outputs Buttons,
calendar,
and clock
Analog
input
Model
CPU
Units
Standard
LCD type
10 Yes 100 to 240 VAC 6 100 to 240 VAC 4 Relays Yes No ZEN-10C1AR-A-V2
12 to 24 VDC 12 to 24 VDC Yes ZEN-10C1DR-D-V2
Transistors ZEN-10C1DT-D-V2
20 100 to 240 VAC 12 100 to 240 VAC 8 Relays No ZEN-20C1AR-A-V2
12 to 24 VDC 12 to 24 VDC Yes ZEN-20C1DR-D-V2
Transistors ZEN-20C1DT-D-V2
LED type
without
display
(See note 1.)
10 No 100 to 240 VAC 6 100 to 240 VAC 4 Relays No No ZEN-10C2AR-A-V2
12 to 24 VDC 12 to 24 VDC Yes ZEN-10C2DR-D-V2
Transistors ZEN-10C2DT-D-V2
20 100 to 240 VAC 12 100 to 240V AC 8 Relays No ZEN-20C2AR-A-V2
12 to 24 VDC 12 to 24 VDC Yes ZEN-20C2DR-D-V2
Transistors ZEN-20C2DT-D-V2
Economy
type
(Expansion
I/O Units
cannot be
connected)
10 Yes 100 to 240 VAC 6 100 to 240 VAC 4 Relays Yes No ZEN-10C3AR-A-V2
12 to 24 VDC 12 to 24 VDC Yes ZEN-10C3DR-D-V2
20 100 to 240 VAC 12 100 to 240 VAC 8 Relays No ZEN-20C3AR-A-V2
12 to 24 VDC 12 to 24 VDC Yes ZEN-20C3DR-D-V2
Communica-
tions type
10 100 to 240 VAC 6 100 to 240 VAC 3 Relays No ZEN-10C4AR-A-V2
12 to 24 VDC 12 to 24 VDC Yes ZEN-10C4DR-D-V2
ZEN Kit Set containing CPU Unit (ZEN-10C1AR-A-V2), Connecting Cable, ZEN Support Software, and manual. ZEN-KIT01-EV4
Set containing CPU Unit (ZEN-10C1DR-D-V2), Connecting Cable, ZEN Support Software, and manual. ZEN-KIT02-EV4
Expansion I/O Units 8 --- 100 to 240 VAC 4 100 to 240 VAC 4 Relays --- ZEN-8E1AR
(See notes 2, 3.)
12 to 24 VDC 12 to 24 VDC ZEN-8E1DR
(See note 2.)
--- Transistors ZEN-8E1DT
(See note 2.)
Power ratings Input voltage Output voltage Output current Model
30 W 100 to 240 VAC 24 VDC 1.3 A ZEN-PA03024

6Programmable Relay ZEN V2 Units
Accessories (Order Separately)
Note: 1. Memory Cassettes created using a CPU Unit can be read to other CPU Units, regardless of which model is used. Restrictions, apply, however, to
the functions that can be used, depending on the CPU Unit version combination. For details, refer to “Memory Cassette and CPU Unit
Combinations” on page 33.
2. Standard LCD-type, Economy-type, and Communications-type CPU Units (i.e., excluding ZEN-@C2@@-@-V2 models).
3. LED-type CPU Unit without display (i.e., ZEN-@C2@@-@-V2 models).
Mounting Accessories (Order Separately)
System Configuration
Note: 1. Up to 3 Expansion I/O Units can be connected to any type of CPU Unit except for Economy-type CPU Units. Expansion I/O Units with AC Inputs,
however, cannot be connected to CPU Units with DC Power Supplies.
2. The Connecting Cable and Memory Cassette cannot be connected to the ZEN at the same time.
3. Programs cannot be written to LED-type CPU Units (i.e., ZEN-@C2@@-@-V2 models) without the ZEN Support Software or a Memory Cassette.
Name Specifications Remarks Model
Memory Cassette EEPROM (for data
security and copying)
Enables programs and parameter settings to be saved or copied to another
ZEN. (See note 1.)
ZEN-ME01
LCD-type CPU Unit with
display (See note 2.)
LED-type CPU Unit without
display (See note 3.)
Transfer from ZEN to
Memory
Supported Not supported
Transfer from Memory
Cassette to ZEN
Supported Automatic transfer when
power turned ON
Memory Cassette
initialization
Supported Not supported
Connecting Cable 2 m RS-232C (9-pin D-
sub connector)
--- ZEN-CIF01
Battery Unit 10 years min. Battery life
(at 25°C)
Ladder programs and parameter settings are saved to the CPU Unit EEP-ROM
but calendar, clock, and holding timer bits and holding timer/counter present
values are held by the capacitor. Therefore, if the power supply is interrupted
for 2 days or more (at 25°C), this data will be reset. Use a Battery Unit for
systems where the power supply may be interrupted for long periods.
ZEN-BAT01
ZEN Support
Software
Runs on Windows 95, 98,
2000, ME, XP, or NT 4.0.
Specifically designed for the ZEN (CD-ROM). ZEN-SOFT01-V4
Name Specifications Model
Mounting Track 50 cm (l) ×7.3 mm (t) PFP-50N
1 m (l) ×7.3 mm (t) PFP-100N
1 m (l) ×16 mm (t) PFP-100N2
End Plate PFP-M
Spacer PFP-S
CPU UnitPower Supply Unit
Connecting Cable
Support Software
Memory Cassette
Battery Unit
Expansion I/O Units

Programmable Relay ZEN V2 Units 7
Specifications
■Ratings
Note: 1. Can be mounted to 35-mm DIN Track.
2.
Item Specification
ZEN-@C@AR-A-V2/ZEN-8E1AR ZEN-@C@D@-D-V2/ZEN-8E1D@
Rated supply voltage 100 to 240 VAC, 50/60 Hz 12 to 24 VDC (DC ripple rate: 5% max.)
Operating voltage range 85 to 264 VAC 10.8 to 28.8 VDC
Power consumption CPU Units without Expansion I/O Units
•ZEN-10C1AR-A-V2/ZEN-10C2AR-A-V2/
ZEN-10C3AR-A-V2
100 V AC: 5 VA max.
240 V AC: 7 VA max.
•ZEN-10C4AR-A-V2
100 V AC: 6 VA max.
240 V AC: 8 VA max.
•ZEN-20C@AR-A-V2
100 V AC: 7 VA max.
240 V AC: 10 VA max.
CPU Units with three Expansion I/O Units
•ZEN-10C1AR-A-V2/ZEN-10C2AR-A-V2
100 V AC: 6 VA max.
240 V AC: 8 VA max.
•ZEN-10C4AR-A-V2
100 V AC: 7 VA max.
240 V AC: 9 VA max.
•ZEN-20C@AR-A-V2
100 V AC: 8 VA max.
240 V AC: 11 VA max.
Expansion I/O Units
•ZEN-8E1AR
100 V AC: 3 VA max.
240 V AC: 4 VA max.
CPU Units without Expansion I/O Units
•ZEN-10C@DR-D-V2
12/24 V DC: 3 W max.
(ZEN-10C3DR-D-V2: 2.8 W max.)
•ZEN-10C@DT-D-V2
12/24 V DC: 2 W max.
•ZEN-20C@DR-D-V2
12/24 V DC: 4 W max.
•ZEN-20C@DT-D-V2
12/24 V DC: 2 W max.
CPU Units with three Expansion I/O Units
•ZEN-10C@DR-D-V2
12/24 V DC: 4 W max.
•ZEN-10C@DT-D-V2
12/24 V DC: 3 W max.
•ZEN-20C@DR-D-V2
12/24 V DC: 5 W max.
•ZEN-20C@DT-D-V2
12/24 V DC: 3 W max.
Expansion I/O Units
•ZEN-8E1DR
12/24 V DC: 2 W max.
Inrush current ZEN-10C@AR-A-V2: 4.5 A max.
ZEN-20C@AR-A-V2: 4.5 A max.
ZEN-8E1AR: 4 A max.
ZEN-10C@D@-D-V2: 30 A max.
ZEN-20C@D@-D-V2: 30 A max.
ZEN-8E1DR: 15 A max.
Ambient temperature 0 to 55°C (−25 to 55°C for ZEN-@C2@@-@-V2 models)
Ambient storage temperature −20 to 75°C (−40 to 75°C for ZEN-@C2@@-@-V2 models)
Ambient humidity 10% to 90% (with no condensation)
Ambient conditions No corrosive gases
Mounting method Surface mounting, DIN track mounting (standard (vertical) installation and horizontal installation) (See notes 1
and 2.)
Terminal block Solid-line terminal block (use solid wire or fine-stranded wire)
Terminal screw tightening
torque
0.565 to 0.6 N·m (5 to 5.3 in-lb)
Degree of protection IP20 (Mounted inside a control panel)
Standard (Vertical) installation Horizontal installation

8Programmable Relay ZEN V2 Units
■Characteristics
Note: 1. Up to 34 points for CPU Units with 10 I/O points. With Communications-type CPU Units, however, the CPU Unit has 6 inputs and 3 outputs, for a maximum
of 33 I/O points.
2. Not provided for LED-type CPU Unit without display (i.e., ZEN-@C2@@-@-V2 models).
■Communications Specifications (Communications-type CPU Units)
Item Specification
Control method Stored program control
I/O control method Cyclic scan
Programming language Ladder diagram
Program capacity 96 lines (3 input conditions and 1 output per line)
Max. No. of control I/O points 44 points (See note 1.)
CPU Units with 20 I/O points: 12 inputs and 8 outputs
Expansion I/O Units: 4 inputs and 4 outputs each, up to 3 Units.
LCD display (See note 2.) 12 characters ×4 lines, with backlight
Operation buttons (See note 2.) 8 (4 cursor buttons and 4 operation buttons)
User program backup Internal EEPROM, Memory Cassette (optional)
Power interruption hold Internal holding bit status, holding timer/counter present values, calendar and clock (year, month, day of month,
day of week, time)
•Super capacitor backup time: 2 days min. (25°C)
•Life of optional battery: 10 years min. (25°C)
Calendar and clock function
(See note 2.)
Accuracy: ±15 s/month (at 25°C)
Timer accuracy 0.01 s unit: −0.05% −10 ms max. (rate for set value)
min/s unit: −0.05% −1 s max. (rate for set value)
h/min unit: −0.05% −1 min max. (rate for set value)
Maximum counting speed 150 Hz: 8-Digit counter (F) set to high-speed operations (CPU Units with DC power supplies only)
(The counting speed may be less than 150 Hz depending on the cycle time of the program. See page 21.)
Insulation resistance 20 MΩ(at 500 VDC) min.:
Between power supply terminals and all output terminals.
Between terminals of different output circuits.
Between all terminals of CPU Unit and all terminals of Expansion I/O Unit.
Insulation • Reinforced insulation
Between power supply or input terminals and output terminals.
Between terminals of different output circuits.
Between all terminals of CPU Unit and all terminals of Expansion I/O Unit.
•No separation
Between power supply and input terminals of the same unit.
Between power supply terminals of CPU Unit and computer connector,
Battery Unit connector, or all Expansion Unit connectors (all interfaces are live parts).
Dielectric strength 2,300 VAC, 50/60 Hz for 1 min (leakage current 1 mA max.):
Between power supply terminals and all output terminals.
Between terminals of different output circuit.
Between all terminals of CPU Unit and all terminals of Expansion I/O Unit.
Vibration resistance Conforms to IEC60068-2-6, 5 to 9 Hz with 3.5-mm single amplitude, 9 to 150 Hz acceleration 9.8 m/s2,
10 sweeps each in X, Y, and Z directions (1 octave/min)
Shock resistance Conforms to IEC60068-2-27, 147 m/s2, 3 times each in X, Y, and Z directions.
Weight CPU Unit with 10 I/O points: Approx. 300 g max.
CPU Unit with 20 I/O points: Approx. 350 g max.
Expansion I/O Unit: Approx. 120 g max.
Item ZEN-10C4@R-@-V2
Communications RS-485 (two-wire, half duplex)
Synchronization method Start-stop synchronization
Baud rate 4800, 9600, or 19200 bps
Transmission code ASCII
Data bit length 7 or 8 bits
Stop bit length 1 or 2 bits
Error detection Vertical parity (none, even, odd), Block check character (BCC)
Flow control None
Interface RS-485
Retry function None
Node number 0 to 99 (default: 1), XX (broadcasting)

Programmable Relay ZEN V2 Units 9
■Approved Standards
Note: EMC conforms to EN 61131-2 clause 8 except in the following cases.
•When Expansion I/O Units with DC inputs are connected to a CPU Unit with an AC power supply, the burst immunity between power
supplies will be 1 kv.
•When the signal wire for transistor outputs exceeds 10 m, the surge immunity of DC output signal lines will not conform.
■Input Specifications
CPU Units
AC Inputs (Not Isolated)
Note: Can be selected using the filter settings.
DC Inputs: I0 to I3 for Units with 10 I/O points, I0 to I9 for Units with 20 I/O Points (Not Isolated)
Note: Can be selected using the input filter settings, except when I0 is being used for an 8-digit counter with a high-speed input.
Item Specification
Safety standards cULus: UL508/CSA C22.2 No.142 Class I Div2
Conforms to EN/IEC 61131-2 clause 11, excluding 11.7.2.2 (Overvoltage category 2 and Pollution degree II
conforms to IEC 60664-1)
EMC
(See note.)
Radiation Field Emission CISPR11 Class A, Group 1
Noise Terminal Voltage Emission CISPR11 Class A, Group 1
Electrostatic Discharge Immunity IEC61000-4-2 In air: 8 kV, In contact: 6 kV
Electromagnetic Field Immunity IEC61000-4-3 10 V/m
Electrical Fast Transient/Burst Immunity IEC61000-4-4 Power line
AC I/O: 2 kV
DC I/O: 1 kV
Surge Immunity IEC61000-4-5 Normal Noise
AC power supply, AC I/O: 1 kV
DC power supply, DC I/O: 0.5 kV
Common Noise
AC power supply, AC I/O: 2 kV
DC power supply: 1 kV
DC I/O: 0.5 kV
Immunity to Conducted Disturbances Induced by Radio-frequency Fields
IEC61000-4-6 3 V
Momentary Power Interruption Immunity IEC61131-2 CPU Units with AC Power Supplies:
10 ms max.
CPU Units with DC Power Supplies:
2 ms max. (level: PS1)
Item Specifications Circuit drawing
Input voltage 100 to 240 VAC +10%, −15%, 50/60 Hz
Input impedance 680 kΩ
Input current 0.15 mA/100 VAC, 0.35 mA/240 VAC
ON voltage 80 VAC min.
OFF voltage 25 VAC max.
ON response time 50 ms or 70 ms at 100 VAC (See note.)
100 ms or 120 ms at 240 VAC (See note.)
OFF response time
Item Specifications Circuit drawing
Input voltage 12 to 24 VDC +20%, −10%
Input impedance 5.3 kΩ
Input current 4.5 mA (typ.)/24 VDC
ON voltage 8 VDC min.
OFF voltage 5 VDC max.
ON response time 15 ms or 50 ms (See note.)
OFF response time
100 to 240 VAC
N
L
IN
IN 330 kΩ300 kΩ
51 kΩInternal
circuit
12 to 24 VDC
5.1 kΩ1.8 kΩ
IN
IN
COM
Internal
circuit

10 Programmable Relay ZEN V2 Units
DC Inputs: I4 and I5 for Units with 10 I/O points, Ia and Ib for Units with 20 I/O Points
(Not Isolated)
Note: Can be selected using the input filter settings.
Expansion I/O Units
AC Inputs (Not Isolated)
Note: Can be selected using the input filter settings.
DC Inputs (ZEN-8E1DR: Not Isolated, ZEN-8E1DT: Photocoupler Isolated)
Note: 1. Can be selected using the input filter settings.
2. The ZEN-8E1DT has no +/- terminals. There is no need to supply power.
Item Specifications Circuit drawing
DC Inputs Input voltage 12 to 24 VDC +20%, −10%
Input impedance PNP: 5.5 kΩ/14 VDC min.
100 kΩ/14 VDC max.
NPN: 5.2 kΩ
Input current PNP: 4.3 mA (typ.)/24 VDC
NPN: 4.6 mA (typ.)/24 VDC
ON voltage 8 VDC min.
OFF voltage 3 VDC max.
ON response time 15 ms or 50 ms (See note.)
OFF response time
Analog
Inputs
Input range 0 to 10 V
External input
impedance
100 kΩmin.
Resolution 0.1 V (1/100 FS)
Accuracy ±1.5% FS (at ambient operating temperature within
rated range)
AD conversion data 0 to 10.5 V (in increments of 0.1 V)
12 to 24 VDC
IN
COM
6.2 kΩ
220 kΩ
5.6 kΩ
150 kΩ
47 kΩ
47 kΩ
27 kΩ
−
+
Internal circuit
Analog voltage output device
Item Specifications Circuit drawing
Input voltage 100 to 240 VAC +10%, −15%, 50/60 Hz
Input impedance 680 kΩ
Input current 0.15 mA/100 VAC, 0.35 mA/240 VAC
ON voltage 80 VAC min.
OFF voltage 25 VAC max.
ON response time 50 ms or 70 ms at 100 VAC (See note.)
100 ms or 120 ms at 240 VAC (See note.)
Off response time
Item Specifications Circuit drawing
Input voltage 12 to 24 VDC +20%, −10%
Input impedance 6.5 kΩ
Input current 3.7 mA (typ.)/24 VDC
ON voltage 8 VDC min.
OFF voltage 5 VDC max.
ON response time 15 ms or 50 ms (See note 1.)
OFF response time
IN
IN
100 to
240 VAC
N
L
330 kΩ
51 kΩ
300 kΩ
Internal circuit
12 to
24 VDC
6.2 kΩ
(See
note 2.)
1.8 kΩ
IN
IN
±
COM
Internal
circuit

Programmable Relay ZEN V2 Units 11
■Output Specifications (CPU Units and Expansion I/O Units)
Units with Relay Outputs
Units with Transistor Outputs
Item Specifications Circuit drawing
Maximum switching capacity 250 VAC/8 A (resistive load: cosφ= 1)
24 VDC/5 A (resistive load)
Use the following values for the total of all outputs.
CPU Units with 10 I/O points: 20 A max.
(15 A max. for Communications-type CPU Units)
CPU Units with 20 I/O points: 40 A max.
Expansion I/O Units: 20 A max.
Minimum switching capacity 5 VDC/10 mA (resistive load)
Relay life Electrical Resistive load: 50,000 times (cosφ= 1)
Inductive load: 50,000 times (cosφ= 0.4)
Mechanical 10 million times
ON response time 15 ms max.
OFF response time 5 ms max.
Item Specifications Circuit drawing
Maximum switching capacity 24 VDC +20%, 500 mA Each circuit is configured with an independent common
circuit
Leakage current 0.1 mA max.
Residual voltage 1.5 V max.
ON response time 1 ms max.
OFF response time 1 ms max.
Q0 to Q3/OUT0 to OUT3
Q4/Q6
COM
Q5/Q7
Models with
20 I/O points
only
L
L
L
Internal circuit
1,000
300
100
10 02 4 6 810
Contact current (A)
30
50
500
250-VAC resistive load
24-VDC resistive load/
250-VAC inductive load
24-VDC inductive load
(t = 7 ms)
Life (×10
3
)
The life under the worst conditions, of the output contacts used in
ZEN relay outputs is given in the above table. Guidelines for the
normal life of the relays are shown in the diagram on the right.
Life-test Curve (Reference Value)
Usage: 360 times/hour
Note: The switching capacity, switching durability, and applicable
load area when actually using the relay depend on the type of
load, environmental conditions, and switching conditions.
Therefore, be sure to confirm these conditions for the actual
machine before use.
Q0 to Q3/OUT0 to OUT3
Models with
20 I/O points
only
390 Ω
COM
Q4/Q6
Q5/Q7
28.8 VDC max.
28.8 VDC max.
L
L
L
L
1 kΩ
+
Internal
circuit

12 Programmable Relay ZEN V2 Units
Connections
■Input Connections
Units with AC Power Supply
Note: 1. Supply power to both the CPU Unit and Expansion I/O Units from the same power supply and turn them ON and OFF at the same time.
2. The input circuit commons for CPU Units with AC power supply are internally connected to the N terminal of the power supply circuit.
Wire the L terminal to the power supply of the input device.
3. The input circuit commons for Expansion I/O Units with AC power supply are internally connected to the N terminal of the power supply
circuit. Wire the L terminal to the power supply of the input device.
CPU Units with 10 I/O Points and Expansion I/O Units
CPU Units with 20 I/O Points and Expansion I/O Units
Connecting Expansion I/O Units with DC Inputs
Note: When connecting Expansion I/O Units with DC inputs to a CPU Unit with an AC power supply, the burst noise immunity will be 1 kV
(IEC 61000-4-4).
L N IN0 IN1 IN2 IN3
L N NC I0 I1 I2 I3 I4 I5
100 to 240 VAC, 50/60 Hz
LN
Circuit
protector Input device
CPU Unit with 10 I/O points ZEN-8E1AR Expansion
I/O Unit
(
AC in
p
ut t
yp
e
)
L N NC I0 I1 I2 I3 I4 I5 NC I6 I7 I8 I9 Ia Ib
L N IN0 IN1 IN2 IN3
LN
Circuit
protector
CPU Unit with 20 I/O points ZEN-8E1AR
Expansion I/O Unit
(AC input type)
100 to 240 VAC, 50/60 Hz
Input device
L N NC I0 I1 I2 I3 I4 I5
COM IN0 IN1 IN2 IN3 COM IN0 IN1 IN2 IN3
LN
CPU Unit with 10 I/O points
100 to 240 VAC, 50/60 Hz DC power supply
Circuit
protector
Input
device
ZEN-8E1DR
Expansion I/O Unit
(DC inputs and
relay outputs)
Input
device
ZEN-8E1DT
Expansion I/O Unit
(DC inputs and
transistor outputs)

Programmable Relay ZEN V2 Units 13
Units with DC Power Supply
Note: 1. Be sure to connect the COM terminal before turning ON the power supply. If the COM terminal is disconnected, or if the wiring is changed
after turning ON the power supply, a malfunction may occur.
2. Apply the power supply voltage through a relay or switch in such a way that the voltage reaches the rated value within 4 s. If the voltage
is applied gradually, the power may not be reset or unstable output operations may result.
CPU Units with 10 I/O Points
For Connections to Negative (−) Common (PNP Connection)
COM
CPU Unit with 10 I/O points
Input device
12 to 24 VDC
For Connecting Analog Input Devices to Input Terminals I4 and I5
CPU Unit with 10 I/O points
12 to 24 VDC
COM
I0 I1 I2 I3 I4 I5
For Connections to Positive (+) Common (NPN Connection)
COM I0 I1 I2 I3 I4 I5
+−
12 to 24 VDC
CPU Unit with 10 I/O points
Input
device
Note: When connected to the positive (+) common, I4 and I5 cannot be used as analog inputs.
Note: When connecting an analog input device, always connect the negative side to the COM terminal.

14 Programmable Relay ZEN V2 Units
CPU Units with 20 I/O Points
For Connections to a Negative Common (PNP Connection)
For Connecting Analog Input Devices to Input Terminals Ia and Ib
For Connections to Positive (+) Common (NPN Connection)
Note: When connected to the positive (+) common, Ia and Ib cannot be used as analog inputs.
Expansion I/O Units
Note: 1. Supply power to both the CPU Unit and Expansion I/O Units from the same power supply and turn them ON and OFF at the same time.
2. ZEN-8E1AR Expansion I/O Units with AC inputs cannot be connected to CPU Units with DC power supply.
3. The input circuit commons for ZEN-8E1DR Expansion I/O Units with relay outputs are each internally connected to one side of the power
supply circuit (COM terminal).
4. ZEN-8E1DT Expansion I/O Units with transistor outputs do not need to be connected to a power supply.
For Connections to Negative (−) Common
For Connections to Positive (+) Common
COM I5 I6NC I7 I8 I9 Ia IbI0 I1 I2 I3 I4
CPU Unit with 20 I/O points
Input device
12 to 24 VDC
CPU Unit with 20 I/O points
12 to 24 VDC
COM I5 I6NC I7 I8 I9 Ia IbI0 I1 I2 I3 I4
Note: When connecting an analog input device, always connect the negative side to the COM terminal.
+−COM I5 I6NC I7 I8 I9 Ia IbI0 I1 I2 I3 I4
12 to 24 VDC
CPU Units with 20 I/O
p
oints
Input devic
e
+−COM I5I0 I1 I2 I3 I4 ±COM IN0 IN1 IN2 IN3 COMNC IN0 IN1 IN2 IN3
12 to 24 VDC
CPU Unit with 10 I/O points ZEN-8E1DR
Expansion I/O Unit
(DC input, relay output)
ZEN-8E1DT
Expansion I/O Unit
(DC input, transistor output)
Input
device
Input
device
+−COM I5I0 I1 I2 I3 I4 ±COM IN0 IN1 IN2 IN3 COMNC IN0 IN1 IN2 IN3
12 to 24 VDC
CPU Unit with 10 I/O points ZEN-8E1DR
Expansion I/O Unit
(DC input, relay output)
ZEN-8E1DT
Expansion I/O Unit
(DC input, transistor output)
Input
device
Input
device

Programmable Relay ZEN V2 Units 15
■Output Connections
Units with Relay Outputs
All four relay output circuits in both CPU Units with 10 I/O points and Expansion I/O Units have independent contacts. CPU Units with 20 I/O points
have 4 independent contacts (Q0 to Q3) and the remaining four (Q4 to Q7) have 2 points/common. There are no restrictions for polarity.
Standard LCD-type CPU Units, LED-type CPU Units, and Economy-type CPU Units
Communications-type CPU Units Expansion I/O Units
Units with Transistor Outputs
For CPU Units with 10 I/O points and Expansion I/O Units, all 4 outputs in the transistor output circuits have independent circuits. The terminals of
output have polarity given on the terminal block, but no problem will result from reversing the connection positions of the power supply and load.
For CPU Units with 20 I/O points, outputs Q0 to Q3 in the transistor output circuits have independent circuits and outputs Q4 to Q7 have 2 points
per common. The terminals of output Q0 to Q3 have polarity given on the terminal block, but no problem will result from reversing the connection
positions of the power supply and load.
Note: Do not exceed a cable length of 10 m when connecting transistor outputs.
Standard LCD-type CPU Units and LED-type CPU Units without Display
Expansion I/O Units
Q0 Q1 Q2 Q3 Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
Load Load Load Load Load Load Load Load Load Load Load Load
CPU Unit with 10 I/O Points CPU Unit with 20 I/O Points
Q0 Q1 Q2
RS-485
B (+) A (−)
Load Load Load
Communications-type CPU Unit
OUT
0OUT 1
OUT
2OUT 3
Load Load Load Load
Expansion I/O Unit
Q0
+−+−+−+−
Q1 Q2 Q3 +−+−+−+−+−− +−− Q0 Q1 Q2 Q3 Q4 Q5 Q6 Q7
Load Load Load Load
Load
Load Load Load Load Load Load Load Load
CPU Unit with 10 I/O Points CPU Unit with 20 I/O Points
Q0 to Q3
Load
Q0 to Q3
Expansion I/O Unit
OUT2 OUT3
OUT0 OUT1
−
+−
+
−
+
−
+
OUT0 to OUT3
Load Load Load Load Load

16 Programmable Relay ZEN V2 Units
Nomenclature
■Standard LCD-type, Economy-type, and Communications-type CPU
Units (Except for ZEN-@C2@@-@-V2 Models)
Note: 1. With Communications-type CPU Units, the Q3 terminal is used as the RS-485 terminal. For details, refer to “Output Connections” on page
15.
2. Economy-type CPU Units are not provided with an Expansion Unit connector. Do not remove the cover.
Left side Front Right side
Display
screen
Power supply
terminals
Input
terminals
Operation
buttons
Output terminals
(See note 1.)
Battery Unit connector
(Remove the seal to
connect the Battery Unit.)
ZEN Support Software connector
(also used for Memory Cassette.)
Expansion Unit connector
cover (See note 2.)
Do not remove this cover until
connecting an Expansion Unit.
Left side Front Right side
Display
screen
Power supply
terminals
Input terminals
Output terminals
Battery Unit connector
(Remove the seal to
connect the Battery Unit.)
ZEN Support Software connector
(also used for Memory Cassette.)
Expansion Unit connector
cover (See note 2.)
Do not remove this cover until
connecting an Expansion Unit.
Q 4
I 6 I 7 I 8 I 9 I a I b
Q 6 Q 5 Q 7
20C1AR-A-V2
Operation
buttons
RUN ERR
CPU Units with 10 I/O Points
CPU Units with 20 I/O Points
Display Screen
Icon Meanings
Icon Meaning
RUN Display while in RUN mode.
ERR Indicates an error.
▲Displayed when there is a
higher-level menu or ladder
program line than the one
currently displayed.
▼Displayed when there is a
lower-level menu or ladder
program line than the one
currently displayed.
Displayed when a password
had been set.

Programmable Relay ZEN V2 Units 17
Operation Buttons
ESC Button OK Button
DEL Button ALT Button
Cursor
Buttons
Operation Button Names and Operations
Button Function
Menus Writing ladder program Setting parameters Button input
bit
(See page 24.)
DEL --- Deletes inputs, outputs, connection
lines, and blank lines.
--- B6 ON
ALT --- •Switches between normally open
and normally closed conditions.
•Changes to connection line write
mode.
•Inserts a line.
--- B7 ON
Up Moves the cursor
up and down.
•Moves the cursor up and down.
•Selects bit types and functions.
•Moves the cursor up
and down.
•Changes numerals
and parameters.
B5 ON
Down B2 ON
Left --- Moves the cursor right and left. Moves the cursor right
and left.
B3 ON
Right B4 ON
ESC Returns to the
previous screen.
Cancels the setting and returns to
the previous operation.
Cancels the setting
and returns to the
previous operation.
B0 ON
OK Selects the
menu item at the
cursor position.
Confirms the setting. Confirms the setting. B1 ON

18 Programmable Relay ZEN V2 Units
■LED-type CPU Units without Display (ZEN-@C2@@-@-V2)
■Expansion I/O Units (ZEN-8E1@@)
Precaution when Using Expansion I/O Units:
Up to three Expansion I/O Units can be connected.
When removing the Expansion Unit connector cover from the side of the CPU Unit, use a
Phillips screwdriver to remove the cover screw, and then insert a flat-blade screw driver in
the cover gap to remove the cover, as shown at the right.
Left side Front Right side
LED indicators
Power supply
terminals
Input
terminals
Output terminals
Battery Unit connector
(Remove the seal to connect
the Battery Unit.)
ZEN Support Software connector
(also used for Memory Cassette.)
Expansion Unit connector
cover
Do not remove this cover until
connecting an Expansion Unit.
LED indicators
Front
Left side Right side
Power supply
terminals
Input terminals
Output terminals
Battery Unit connector
(Remove the seal to
connect the Battery Unit.)
ZEN Support Software connector
(also used for Memory Cassette.)
Expansion Unit connector cover
Do not remove this cover until
connecting an Expansion I/O Unit.
I 6 I 7 I 8 I 9 I a I b
20C2AR-A-V2
Q 4 Q 6 Q 5 Q 7
CPU Units with 10 I/O Points
CPU Units with 20 I/O Points
LED Indicators
Name LED Status
POWER Green Lit Power is ON.
Not lit Power is OFF.
RUN Green Lit Operating
(RUN)
Not lit Stopped
(STOP)
ERROR Red Lit Error
occurred.
Not lit Normal
Left side Front Right side
Input terminals
Power supply terminals
Output terminals
Expansion I/O Unit connector
Expansion I/O Unit connector cover
Do not remove this cover until connecting
an Expansion I/O Unit.
Phillips screwdriver Flat-blade screwdriver

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

20 Programmable Relay ZEN V2 Units
2. Using Timers and Holding Timers
3. Using Holding Timers
X: ON-delay timer
Turns ON after set delay after the trigger input turns ON.
Basic Operation
Main Applications
When delayed operation or a time lag is required.
■: OFF-delay timer
Stays ON while the trigger input is ON and turns OFF after a set delay
after the trigger input has turned OFF.
Basic Operation
Main Applications
Useful for OFF delay circuits for lights or fans
O: One-shot pulse timer
Turns ON for a set period after the trigger input turns ON and regardless
of how long the trigger input remains ON.
Basic Operation
Main Applications
Useful for set operations where operation is always required during a
regular period only.
F: Flashing pulse timer
Repeatedly turns ON and OFF in a set cycle while the trigger input is ON.
Basic Operation
Main Applications
Useful for flashing emergency lights or sounding buzzers as the output
for an alarm circuit.
W: Twin timer
Repeatedly turns ON and OFF in a set cycle while the trigger input is ON.
Independent ON- and OFF-time settings are possible.
Basic Operation
Main Applications
Useful for intermittent (ON/OFF) operation, such as that used for fans.
Trigger input
Reset input
Setting
Present value
0
Timer bit
Timing
Trigger input
Output
0
Trigger input
Reset input
Setting
Present value
Timer bit
Timing
Trigger input
Output
0
Trigger input
Reset input
Setting
Present value
Timer bit
Timing
Trigger input
Output
0
Trigger input
Reset input
Setting
Present value
Timer bit
Timing
Trigger input
Output
Timing Timing Timing
0
OFF-time
ON-time
Trigger input
Reset input
Present value
Timer bit
Trigger input
Output
Timing
(OFF-time)
Timing
(ON-time)
Timing
(OFF-time)
Timing
(ON-time)
X: ON-delay timer
Turns ON after set delay after the trigger input turns ON. The present
value is held while the trigger input is OFF.
Main Applications
To continue operation after momentary power loss or power interruptions.
Also can be used when delayed operation or a time lag is required.
0
Trigger input
Reset input
Setting
Present value
Timer bit