Omron ZEN User manual

OMRON ELECTRONICS, S.A. Page 1
ZEN
Quick Guide
THIS MANUAL CONTAINS:
1 FEATURES
2 FUNCTIONALITY
3 HANDLING THE EQUIPMENT
4 CONNECTIONS
5 I/O ADDRESSING
6 CREATING A PROGRAM
7 PROGRAMMING FUNCTIONS
8 TROUBLESHOOTING
9 ACCESSORIES

1 Features ZEN Programmable Logic Module
OMRON ELECTRONICS, S.A. Page 2
1 Features
The ZEN programmable logic module provides a total of 10 I/O points (6
inputs and 4 outputs). It has two types of controllers:
LCD type: with display screen and keypad.
LED type: without display screen and without operating keypad.
1.1 Main Features
The following are some of the most important features:
•Capacity to carry out small scale automatic control at low cost.
•Ladder diagram programming directly in the LCD type CPUs is possible.
•Maximum program capacity of 96 lines.
•Very small dimensions: 90 x 70 x 56 mm.
•Easy to set up and reduced wiring time.
•Upgradable up to 18 inputs and 16 outputs using 3 expansion modules.
•Protection against power supply faults (battery optional).
•Programs easily copied using optional memory cassette.
•Programming and monitoring by computer.
•Large switch capacity up to 8A /contact with 250 VAC.
•Direct AC inputs between 110 and 240 VAC.
•Equipped with 8 configurable timers in 4 operating modes and 3 timer
ranges.
•Also equipped with 8 counters which can work either inclined or declined.
•Clock-calendar functions.
•2 analog inputs in voltage mode (0 to 10 V).
•Possibility of configuring input filters to avoid noise influence.
•The program can be protected by a password.
•Screen menus displayed in 6 languages.
1.2 External Appearance
Output relays
Expansion
connector
Function keypad
•Peripherals port
•EEPROM memory cassette
LCD screen
InputsPower supply

1 Features ZEN Programmable Logic Module
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Output relays
Expansion
connector
•Peripherals port
•EEPROM memory cassette
InputsPower supply

2 Functionality ZEN Programmable Logic Module
OMRON ELECTRONICS, S.A. Page 4
2. Functionality
The display screen for the LCD type CPU and the different ZEN operation
buttons are as follows:
A series of icons giving information about the controller can be activated in the
display. The meaning of these icons is given in the following table:
Icon Meaning
RUN Displayed on screen when in RUN mode
ERR Shows an error
"Displayed on screen when there is a higher level on the menu or
in the ladder program
#Displayed on screen when there is a lower level on the menu or in
the ladder program
Displayed on screen when the password has been activated
Function keypad
FunctionKey Menu Overwriting the program Parameter Settings Associated
bit
DEL --- Deletes inputs, outputs,
connection lines and blank lines --- B6 to ON
ALT --- Switchs to normally open and
normally closed conditions. --- B7 to ON
Up B5 to ON
Down 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 B2 to ON
Left B3 to ON
Right --- Moves the cursor to the right
and left Moves the cursor to the right and left B4 to ON
ESC Returns to
previous screen Cancels operations carried out and returns to the previous
operation
Cancels operations carried out
and returns to the previous
operation
B0 to ON
OK Enters the
menu selected Confirms the settings Confirms the settings B1 to ON
LCD
DEL button
ESC button
ALT button
OK button

3 Handling the Equipment ZEN Programmable Logic Module
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3. Handling the Equipment
This section describes the handling of the display menu and its different
options, such as protecting ladder programs, installing filters on inputs,
adjusting the display contrast, setting the clock to summer time, etc.
3.1. Main Menu
The following screen is displayed as ZEN receives the power supply:
In the case of any expansion module being connected, pressing the ESC key
will monitor the status of the expansion bits.
Day Time (min:s)
Operating mode
Day Time (min:s)
Operating mode

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The main menu is displayed by pressing the OK key on the initial screen, as
shown below:
3.2. Selecting the Language
The ZEN menu is available in 6 languages, which can be selected as follows
(the default language is English)
3.3. Date and Time
Access to the date and time settings window can be gained by following the
menu sequence shown below:
The Up/Down keys switch from the
menu window to other options.
Select LANGUAGE and press OK. By doing this,
the language selection screen is displayed and by
pressing the OK key again, the language flashes,
making it possible to select another language
using the cursors.
Once the language has been selected, press OK
and this confirmation window will appear.

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3.4. Protecting Programs
ZEN has a password function, used to prevent incorrect use of the ladder
program or to prevent manipulation of settings made by the controller.
The password code may comprise the range 0000 to 9999 (4 decimal
numbers).
The password prevents entry to the following points:
•Editing ladder programs
•Monitorng ladder programs
•Changing or erasing the password
•Setting the input filter
•Setting the node number
The Password screen is displayed immediately any of the different options is
selected from the menu. If the password is correct, access to the screen
requested will be given. If not, access will be denied.
3.5. Setting a Password
Select OTHER on the main menu and then the
PASSWORD option.
Press the OK key so that the cursor flashes and
the password can then be entered
Set the Password.
Use the Left and Right keys to select the
digits that need to be changed.
Use the Up/Down keys to enter numbers
from 0 to 9.
Press the OK key. A confirmation message
will be displayed on the screen
The key symbol will be displayed in the
bottom left-hand corner of the screen when
the password has been recorded.

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3.6. Deleting Registered Passwords
3.7. Stabilizing Input Operations
If the ZEN external input fluctuates, it is possible that the operations will be
unstable. To solve this, ZEN is able to filter inputs to stablilize the signal.
The input filters can be set separately, either for the CPU inputs or for each
I/O expansion unit.
Press the OK key so that the cursor flashes
and then enter the password.
Enter the recorded password.
Use the Left and Right keys to change the
numbers of the new password
Use the Up/Down keys to enter numbers
between 0 to 9.
Press the OK key to display the message on
screen confirming deletion of the password.
If the input password does not match to the
original, the display will return to the
previous screen.
If the password is correct, press the OK key
to delete.
They key icon will disappear when the
password has been deleted.
If the input password does not match to the
recorded password, a ‘CHECK ERR’
message will appear on screen. The
password must be reentered.

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Note. The input filter time settings are as follows:
Input specifications Input filter
not used Input filter used
100 Vac 50 ms 70 msAC Input 240 Vac 100 ms 120 ms
DC Input 15 ms 50 ms
The input filter settings are read when ZEN starts the operation.
3.8. Backlight
The LCD backlight is automatically activated when the operation keys are
used. Depending on the setting (see below for more details), this light will
switch itself off 2, 10 or 30 minutes after the function keys have stopped being
used. The backlight can also be left activated (setting always in ON mode).
Press the OK key to display the input
filter setting menu.
Use the Up/Down keys to select from
the Menu the unit for which the input
filters will be set.
Press the OK key twice to make the
cursor flash, activating the input filter.
Use the Up/Down keys to switch
between ON/FF.
Press ON to confirm the settings.
Press ON again to complete the
settings.

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3.9. Adjusting LCD Screen Contrast
Use the following procedure to adjust the LCD contrast when it is difficult to
view the screens.
Press the OK key to view the current
contrast setting. This will be displayed in
the form of a bar graph (5 levels).
A blank level shows that this setting has
not been reached.
Press the OK key again to a flashing cursor
to vary the contrast. The contrast setting
can be changed using the Up/Down or
Right/Left keys.
Pressing the OK key once again requests
confirmation of the new setting. If pressed,
it will be confirmed. Pressing the ESC key
will exit the Contrast Menu with no
changes being made.
Press the OK key to display the current
backlight time.
Press the OK key again to a flashing
cursor to change this time.
Use the Up/Down keys to select
activation time.
Press the OK key to confirm the
settings. Press again to complete
the settings.

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3.10. Setting Summertime
In some countries like our own, the time is changed when a certain season of
the year comes around. ZEN contains this option, which is known as
summertime.
The following steps must be taken to carry out these changes:
Cancel Summertime settings not made.
Manual The clock is put forward one hour
EU Type Period :
From 2:00 am the last Sunday in March until 2:00 am the last
Sunday in August
US Type Period :
From 2:00 am the first Sunday in April until 2:00 am the last
Sunday in August
Once the start time (2:00 am) has
been reached, the clock is put
forward one hour 3:00 am). When
the stop time (2:00 am),the clock is
put back one hour (1:00 am).
Note. On entering the clock display screen, Summertime is activated and an
“S” is displayed in the top right-hand corner to show that this function has
been set.
Press the OK key to enter the
Summertime Menu.
If pressed again, the cursor
flashes, allowing the setting to be
changed.
Select one of the options in the
table using the Up/Down keys.
If OK is pressed, the selection is
confirmed and if the key is
pressed again, confirmation is
given.

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3.11. Reading System Information
Accessing this option will inform you about the CPU Software version, the
CPU unit number and I/O points in the expansion units.
U01.00 Software version (e.g.: 1.00)
010401 Date software created
INT: I06O04 No. of CPU I/O points
EX1:I04O04 No. of I/O points in the exp. unit 1
EX2:I04O04 No. of I/O points in the exp. unit 2
EX3:I00O04 No. of I/O points in the exp. unit 3
RMT:I00000 (for function expansion)
LCD:YES LCD screen selection
RTC:YES Clock-calendar selection
ADC:NO Analog input selection

4 Connections ZEN Programmable Logic Module
OMRON ELECTRONICS, S.A. Page 13
4 Connections
4.1 Input Stage
•Using AC power supply
•Using DC power supply
Note. Inputs 14 and 15 can also be used as analog inputs with an input range
of 0 to 10 V.
4.2 Output Stage
Note. The 4 outputs are completely independent and have no restrictions on
polarity.
I/O expansion unitCPU
I/O expansion unit
(AC inputs)
CPU
Input devices
I/O expansion unit
(DC inputs)
CPU
Input devices
250 VAC, 8A
24 VDC, 5A
ON ƒ16V
OFF 5V
ON ƒ80V
OFF 25V

5 I/O Addressing ZEN Programmable Logic Module
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5. I/O Addressing
The following tables show the I/O addressing, work areas, internal holding bits,
Timers, Counters and ZEN intelligent control screen bits.
I/O, Work and Internal Holding Bits
Area name Symbol Bit
addresses N°bits Function Ladder Program
Input bits I I0 to I5 6 Displays the ON/OFF status of the
input device connected to the CPU
input terminal
Expansion
input bits X X0 to Xb 12 Displays the ON/OFF status of the input device connected to the I/O
expansion unit input terminal
Button switch B B0 to B7 8 Displays the ON/OFF status of the
CPU operating switches (LCD-type
CPU)
Analog
comparator A A0 to A3 4 Outputs the comparison result for analog inputs. Only available for
models with a 24 Vcc power supply.
Comparator
bits P P0 to Pf 16 Compares the present value of timers (T), holding timers (#) and
counters (C) and outputs the
comparison result.
N.O. / N.C inputs
(see note 1)
Output bits Q Q0 to Q3 4 Displays the ON/OFF status of the
output deivces connected to the
CPU unit
Expansion
output bits Y Y0 to Yf 16 Displays the ON/OFF status of the output deivces connected to the I/O
expansion unit
Work relays M M0 to Mf 16 Can only be used with the ladder
program. Cannot output to an
external device.
Holding relays H H0 to Hf 16 The same as previous area but also
maintains its status even without
power supply on.
N.O. / N.C outputs
(see note 1.2)
Note
1 N.O. : Normally open N.C. : Normally closed
2 The following functions can be selected for output bits
[ Normal output Turns to ON or OFF according to the ON/OFF status of execution
condition
S Set When the condition is ON, the output turns to ON
R Reset When the condition is OFF, the output turns to OFF
A Alternative Alternates the output ON/OFFwhen the execution condition is in
ON

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Timers and Counters
Area name Symbol Bit
addresses N°bits Function Ladder Program
Timer T T0 to T7 8 Can be activated between ON-delay,
OFF-delay, one-shot and flashing
pulse operation.
Holding
timer # #0 to #3 4 Maintains the timer value when the trigger input is in OFF mode. The
timer will continue even if turned to
ON mode again.
Clock
timer @ @0 to @7 8 Can be put into ON or OFF mode on a specified day or period.
Calendar
timer * *0 to *7 8 Can be put into ON or OFF mode on a specified date.
Counter C C0 to C7 8 Reversible counter
N.O. / N. C condition
(see note 1)
Note Timers can have the following functions.
X ON delay Time elapsed from the moment the input is triggered until the set timer bit
turns to ON mode.
n OFF delay The timer bit turns to ON mode from the moment the input is triggered
until the set time has elapsed on the timer.
O One-shot The set timer bit turns the selected time to ON mode when the trigger
input switches from OFF to ON mode.
F Flashing pulse The set timer bit constantly switches from OFF to ON mode while the
trigger input remains in ON mode
Display Bits
Area
name Symbol Bit addresses N°bits Function Ladder Program
Display D D0 to D7 8 Displays predefined messages relating to
timers, counters and their present values or
converted analog values.
Output
I/O Bit Addressing
The bit input addresses 10 to 15 and the bit output addresses Q0 to Q3 are
always allocated to the CPU unit.
Up to 3 I/O expansion units can be added, allocating these I/O points to the X0
to Xb input bits and Y0 to Yb as output bits, remembering the order of the
connected expansion units.

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Note
When the I/O expansion unit does not have I/O points, such as a 4-point input
or output unit as shown above, the unused bit addresses are not allocated in
the unit and can be used for the following expansion unit.

6 Creating the Program ZEN Programmable Logic Module
OMRON ELECTRONICS, S.A. Page 17
6. Creating the Program
This section gives a step-by-step explanation of how to implement a simple
contact diagram or circuit on ZEN, and the programming from the display. The
circuit to be used is the following:
6.1. I/O Wiring
6.2. Clearing the Programs
Clear the program before you start writing the
program. By using this option, neither the
language display, the date/time nor the other
settings will be initialized.
OK (1)
OK (1) + ⇓
⇓⇓
⇓(2)
OK (1)
OK (1)
•STOP Mode

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6.3. Writing the Program
Two circuit lines, up to a total of 96 program lines, can be displayed on the
screen at the same time and a maximum of 3 contacts and one output per
program line can be entered.
An example of a ladder diagram:
6.3.1. Writing Input Contacts
Once in the program editing screen, press “OK (1)”and the 0 (10) input
contact appears on the left-hand side of the first line of the program.
•STOP Mode
OK (1)
OK (1)
OK (1)
Shows the ladder program line number at
the cursor position.
Bit type
Address
Output Function
Program line number at cursor position
Connection
line
Bit type
Bit address
Indicates the presence of program lines
underneath the current line
Indicates the presence of program lines
above the current line
N.C. input
N.A. input

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6.3.2. Writing Outputs
First, before entering the output relay, the union line has to be inserted as
follows:
Once the line has been inserted, the cursor is situated on the right of the
program line and the output relay is entered:
Press “ALT (7)”to select the N.C. input.
Use the “♣
♣♣
♣(4)”key to move the cursor
and press “⇑
⇑⇑
⇑(5)”to change the bit
address to 1.
Press “OK (1)”again to enter another
N.A. contact in series with the previous
contact.
Press “OK (1)”to enter another new
N.A. contact in series with the previous
contacts. This creates the automatic
connection between the first two
contacts entered.
Press “ALT (7)”to enable entering the
connection line option.
The connection line is definitively set up
with the “♣
♣♣
♣(4)”key.
Press “OK (1)”to enter an initial Q0
output. The output type can be selected
using the “⇑
⇑⇑
⇑(5)”and “⇓
⇓⇓
⇓(2)”keys.
Press “OK (1)”twice to confirm writing
Q0 output. The cursor will automatically
go to the next line of the program.

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6.3.3. Writing a Parallel Line (OR)
6.3.4. Vertical Connection Lines
Press “OK (1)”.
Select Q (CPU output bit) using the “⇑
⇑⇑
⇑(5)”
key.
Confirm writing the contact by pressing “OK
(1)”twice.
Press “ALT (7)”to enable entering the
vertical connection line option.
The vertical and horizontal connection
lines are inserted using the “⇑
⇑⇑
⇑(5)”key.
The (+) symbol indicates the
intersection.
Pressing “OK (1)”confirms writing the
connection lines.