Document ID 7821 V1 20.4.2016
Firmware versions 1.0-1.0
PM20A chassis
Manual
Page 2 - Table of contents
Table of contents
Table of contents ............................................................................................................................................................ 2
Introduction .................................................................................................................................................................... 3
Assembling a new PM20A ............................................................................................................................................... 4
Mounting in a panel ........................................................................................................................................................ 6
Configuration menu overview ........................................................................................................................................ 7
Using the display ............................................................................................................................................................. 8
Display contents and pages ................................................................................................................................................................................... 8
Automatically configuring the display contents ................................................................................................................................................... 9
Manually configuring the display contents ......................................................................................................................................................... 11
Making the display to scan the pages .................................................................................................................................................................. 13
Configuring the colors globally ............................................................................................................................................................................ 14
Configuring the colors individually ...................................................................................................................................................................... 14
Making a color to change at an event .................................................................................................................................................................. 14
Using a dimmer .................................................................................................................................................................................................... 15
Configuring the page indicators .......................................................................................................................................................................... 16
Configuring and using the fault indicator ............................................................................................................................................................ 16
Using the indicators for other purposes .............................................................................................................................................................. 16
Selecting the color for the indicators .................................................................................................................................................................. 16
Attention light ...................................................................................................................................................................................................... 17
Protecting the configuration with a password .................................................................................................................................................... 17
Allowing the user to interact: The setpoints ........................................................................................................................................................ 18
Having auxiliary pages ......................................................................................................................................................................................... 20
Ambient light sensor ............................................................................................................................................................................................ 21
Temperature sensor ............................................................................................................................................................................................. 21
AnyFault register .................................................................................................................................................................................................. 21
Configuring the device using the front panel ............................................................................................................... 22
Beginning a configuration session ....................................................................................................................................................................... 22
Navigating in the menu ........................................................................................................................................................................................ 22
Editing a value ...................................................................................................................................................................................................... 23
Editing a reference ............................................................................................................................................................................................... 25
Ending the configuration session ........................................................................................................................................................................ 25
Using the USB port ........................................................................................................................................................ 26
Functions, tables, Elo… ................................................................................................................................................ 27
Maintenance .................................................................................................................................................................. 28
Troubleshooting ............................................................................................................................................................ 28
Problems .............................................................................................................................................................................................................. 28
Seeing information about the cards .................................................................................................................................................................... 28
Viewing fault messages ........................................................................................................................................................................................ 29
Viewing the registers ............................................................................................................................................................................................ 29
Specifications ................................................................................................................................................................ 30
Environmental...................................................................................................................................................................................................... 30
Dimensions and weight........................................................................................................................................................................................ 30
Warnings ........................................................................................................................................................................ 31
Manufacturer ................................................................................................................................................................. 31
Page 3 - Introduction
Introduction
PM10 is a modular panel-installed meter and controller family for industrial use. PM20A is one type of
chassis in this family. It is a 96x96 mm panel meter chassis consisting of an enclosure, motherboards,
and a display. Various types of input and output cards can be fitted inside.
This manual covers the PM20A chassis. Please supplement this manual with the PM10 system manual
and a manual for each card type used.
PM20A uses the FreeRTOS real-time operating system V8.0.1. The FreeRTOS source code is available
from Nokeval support on request.
Page 4 - Assembling a new PM20A
Assembling a new PM20A
This chapter may be skipped if the device is ordered pre-built.
The PM20A internals consist of two motherboards, support structures, the display board and the
optional cards:
Slot A
Slot E
Display board
PM20ADISP
Lower
motherboard
PM10BAS
Micro USB
connector
Detachable
connectors
Upper
motherboard
PM20EXT
Support plates
Slot F Slot J
To access the internals, pull off all the detachable connector blocks. Then do one of following:
Push the front bezel off. Place your fingers on
the left or the right side of the bezel and push. It
may be quite tight. Then slide the internals out.
This is possible only when the device is not
installed in a panel.
Unscrew the four small Phillips screws in the
back plate. Pull the internals out.
Page 5 - Assembling a new PM20A
If you need to add/remove/set up cards
in the upper floor, remove the two
screws holding the upper support plate
and then the plate itself.
If you need to add/remove/set up cards
in the lower floor, remove the two
screws at the bottom of the lower
motherboard. Then carefully lift the
upper motherboard until it disengages
and then slide it off the display board.
At reassembly, do the opposite,
carefully guiding the pin connector to its
counterpart.
Use ESD precautions – at least touch an earthed object before touching the cards. Avoid touching the
components on the cards, although it may be impossible.
Set the jumpers of the cards as described in the manuals of each card.
Insert the desired cards. The cards can be of any type and placed freely, except:
Use only one power supply card. Place it always in slot E – the back plate has a different
opening.
Do not place a relay card in slot A to keep hazardous voltages away from the USB connector.
When purchasing separate cards, they are accompanied with connector diagram labels. Attach the
labels on the top of the enclosure for the upper floor cards and on the bottom of the enclosure for the
lower floor cards.
Snap the appropriate back plate opening covers off by fingers or by a flat-bladed screwdriver.
Slide the motherboard and the cards in the enclosure guiding the cards in the grooves and refit the
front panel or the back plate.
Page 6 - Mounting in a panel
Mounting in a panel
Prepare a panel cut-out per IEC 61554: width and height 92.0…92.8 mm.
Place the gasket around the PM20A body.
Slide the device in the opening and fasten with two clamps, either on the sides or on top and
bottom.
The backside of the device may have hazardous voltages in the terminals. If this is the case,
the backside must not be accessible without tools. Also tie the wires so that if a wire comes
loose, it can’t contact the other connectors.
Page 7 - Configuration menu overview
Configuration menu overview
The configuration menu items of the display are explained in the relevant chapters. This is just a quick
overview. The other cards have menus of their own, not covered by this manual.
Display
Trunk
Defining the contents of the display.
Page 8.
Auto fill
Page1
Page2
Scan
Controlling how several pages alternate
on the display.
Page 13.
Colors
Selecting colors for the display.
Page 14.
Dimmer
Controlling the display brightness
externally.
Page 15.
Setpoints
Allowing the operator to adjust some
values easily, e.g. alarm levels.
Page 18.
Indicators
Defining the operation of the small
indicator lamps above the display.
Page 16.
Attention
Using the bright red attention light.
Page 17.
Tables
Linearization tables.
PM10 system manual.
Totalizers
Totalizers for accumulating flow.
PM10 system manual.
Funcs
Multi-purpose functions.
PM10 system manual.
Program
Elo program for advanced functionality.
PM10 system manual.
General
Password for the display.
Page 17.
Agents
Controlling the settings dynamically.
PM10 system manual.
Page 8 - Using the display
Using the display
Indicators
Can be used to indicate alarms, digital
input states, and which page is
currently displayed.
Fault indicator
Indicates that there is
something wrong.
Ambient light sensor
Convenient input for
testing purposes. Can be
used to dim the display.
Tag
Gives a hint what the
accompanying reading
is. Can be 1-3 letters or
digits.
Reading
A variable value, e.g.
input or function value.
Keys
For configuring the
device, and for
controlling its functions.
Attention light
Bright red light for
getting attention
when something
happens.
Display contents and pages
The display has three equivalent rows, each consisting of six 11-segment digits. The contents of the
rows are configurable. In practice, every row can contain one of the following options:
A tag
A reading
A tag and a reading
Two readings
Nothing
A tag, meaning some fixed text or numbers, can be used to clarify the contents of the display. Each row
can have a tag of its own. The top row is sometimes used as a title without a reading.
As this device may have more inputs (and other values) than fits on the display, it is possible to define
several pages, each having different tags and readings. The user may switch different pages to the
display using the v and ^ keys, or the device can be configured to scan the pages automatically.
In a newly built device, the display may be blank, as nothing has been configured. The display reading
may come from various sources not limited to the inputs. The display contents may be configured
manually or automatically.
Page 9 - Using the display
Automatically configuring the display contents
In most cases, the task of defining the display (page) contents may be left to PM20A. It will
automatically query the input cards and place their readings on the display, beginning from slot A
inputs. Since the inputs that are switched off are not included, configure the inputs first according to
the input card manuals.
Warning! This will override any manual configurations done in the Page menus.
To start the Auto fill, do one of the following:
Connect to the display (Master) with Mekuwin. Navigate to Display > Auto fill and click Execute.
Switch the device off, hold the < and > keys pressed, and switch the power on. “Autofill” is
displayed for a moment.
Use the Quick configuration menu on the front panel:
Slot A
Slot D
Slot E
Slot C
Master means the
display
Master Autofill
Cancel
Procee
v
TagColor
ValueColor
Brightness
Dec1
Dec2
*
*
^
v
* 1 sec
Conf
Regs
Faults
Info
>
QConf
Save
>
<
<
Use v^ to move
within a menu.
Use < to exit.
The display is now ready for use! Push the v and ^ keys to move among the pages.
The Auto fill may be re-run at any time. Its operation may be tuned with the following settings under
the Display > Auto fill configuration menu:
Layout
How the display is filled with tags and values. See options below.
Tag
How the tag is formed:
Retain: Preserve the previous tag.
None: Remove the tags.
Index: Sequential numbers 1, 2, 3… This is the factory default.
Letter: A letter A, B, C…
SlotReg: A combination of the card slot (A, B…E) and the number of the register on
the card, e.g. A1, A2, B1, B2.
Dec
The number of decimals to show. Each reading will get the same number of decimals, but
they may later be adjusted individually under each page settings.
Auto fill provides several layout options:
Layout setting
Description
Example
Title+Val
The top row has a tag. The middle row has a reading. The bottom
row is blank. This is a “compatibility mode” with Nokeval 538-8
panel meter.
Title+2Val
The middle and bottom rows have a reading. The top row has a tag
consisting of two channel numbers separated by a dash. Each
reading has six digits to use.
3Val
Each row has a tag and a reading. The readings can be up to five
digits long on channels 1-9 and four digits after that.
Page 10 - Using the display
Title+4Val
The middle and bottom rows have two readings each. Top row has
a tag consisting of the first and last channel numbers separated by a
dash. Each reading should have up to three digits.
6Val
Every row has two readings, maximally utilizing the display. If
several pages are used, the indicators above the display can be used
to indicate which page is being displayed as there is no room for
tags.
Page 11 - Using the display
Manually configuring the display contents
Open a configuration connection to Master, either with Mekuwin or on the front panel.
Slot A
Slot D
Slot E
Slot C
Master Display
Setpoints
Indicators
Tables
Totalizers
Funcs
*
^
v
* 1 sec
Regs
Faults
Info
>
QConf
>
Use < to exit.
Conf
Trunk
Auto fill
Page1
Page2
Row1
Row2
Row3
AuxPage3
>
>
Edit the
value
Use < to exit.
Left
Right
Tag
Src
Local col
Alm1
Alm2
Dec
Src
Local col
Alm1
Alm2
>
Set Trunk according to the amount of pages needed. (The word trunk refers to a tree trunk. The pages
are arranged vertically as the user may move among them with the v^ keys. The tree may contain
branches, as demonstrated in “Having auxiliary pages” on page 20.) After setting Trunk, the
corresponding number of Page submenus will be revealed.
Each Page submenu has three submenus, one for each display row. These menus are further divided
into Left and Right submenus.
Configure the left side of a row in the Left submenu. Unless individual colors and alarms are needed, set
just Src, Tag, and Dec.
Src
If you want a reading on the left side of the row (in addition to another reading on the
right side), select the reading source here, typically one register of an input card. If you
don’t want two readings per row, set this to None.
Tag
If you want some fixed text or numbers on the row, write it here. It will appear beginning
from the left edge of the display. The right side of the row may or may not have a reading.
Set blank if desired.
If you want to ensure a gap between the tag and the reading, place a space after the tag.
If the tag is longer than the display, the display will scroll.
You can’t set a tag if there is a left side reading selected with the Src setting.
Dec
Set the number of decimals to show in the reading. A negative setting will round the
corresponding number of last digits to zero. Affects floating point numbers only. This
setting is hidden when Src is set to None.
Examples of 123.4567 on various Dec settings:
Dec
Display
3
123.457
2
123.46
1
123.5
0
123
-1
120
-2
100
Page 12 - Using the display
Configure the right side of the row:
Src
If you want a reading on the right side of the row, select the reading source here, typically
one register of an input card. If you don’t a reading, set this to None.
Dec
Set the number of decimals to show in the reading. A negative setting will round the
corresponding number of last digits to zero. Affects floating point numbers only. This
setting is hidden when Src is set to None.
Examples of 123.4567 on various Dec settings:
Dec
Display
3
123.457
2
123.46
1
123.5
0
123
-1
120
-2
100
Typical usage scenarios of a row and the settings to accomplish it:
Scenario
Example
Left config
Right config
A tag
Src=None
Tag=Inputs (example)
Src=None
A reading
Src=None
Tag=None
Src=some register
A tag and a reading
Src=None
Tag=P1 (example)
Src=some register
Two readings
Src=some register
Src=another register
Nothing
Src=None
Tag=blank
Src=None
Page 13 - Using the display
Making the display to scan the pages
Scanning means that PM20A automatically displays each page for a moment, then advances to the
next.
Conf
Master
Display
Setpoints
Indicators
Tables
Totalizers
...
Trunk
Tandem
Auto fill
Page1
Page2
Scan
Colors
Mode
Range
Interval
Src
Use the following settings under the Display > Scan menu:
Mode
Manual: User may move with v and ^ keys (factory default).
Auto: The pages will be automatically scanned.
Alarming: Like Auto, but the scanning is temporarily stopped if any of the
registers configured under the Alarm submenus are active in the Page
configuration.
External: The page to be displayed is controlled by some register.
Range
The number of pages to scan. The scanning is also limited by the Trunk setting;
the lesser one will define the range.
Interval
The interval in seconds between changing to the next page in Auto and Alarming
modes.
Src
The source controlling the page in External mode. Hidden otherwise.
Even in the Auto and Alarming modes, the user may use the v and ^ keys to move. After eight seconds,
or by pressing simultaneously v+^, the scanning will continue.
Page 14 - Using the display
Configuring the colors globally
For minimum effort, use “global” colors. Then every tag shares the same color. Every left side reading
shares the same color. As does every right side reading. To use global colors:
1. Go to the Display/Colors menu.
2. Go to the LeftValue menu, then to Normal menu. Adjust Hue and Brightness as explained below.
3. Do the same for the Tag and RightValue menus.
4. In each Row menu (under Display/PageX) set the Local color settings to No. The row will then
obey the global colors. By default, they are already set to No. If you used Auto fill, it did this for
you.
Conf
Master
Display
Setpoints
Indicators
Tables
Totalizers
...
Trunk
Dimmer
Auto fill
Page1
Page2
Scan
Colors
Normal
Alm1
Tag
RightValue
Hue
Brightness
Hue
LeftValue
Hue
Brightness
Alm2
Normal
Alm1
Alm2
Normal
Each color is defined by two settings:
Hue
0 = red, 30 = orange, 60 = yellow, 100 = green. Any
intermediate value may be used.
Brightness
0 = almost invisible, 100 = maximum brightness.
Configuring the colors individually
It is possible to override the global colors where needed. Set Local color to Yes in any Left or Right menu
under any Display/Page/Row menu. A new submenu will appear: Color. It contains the Hue and
Brightness settings explained above.
Slot A
Slot D
Slot E
Slot C
Master Display
Setpoints
Indicators
Tables
Totalizers
Funcs
Regs
Faults
Info
QConf
Conf
Trunk
Auto fill
Page1
Page2
Row1
Row2
Row3
AuxPage3
Left
Right
Tag
Src
Local color
Alm1
Alm2
Dec
Src
Local color
Alm1
Color
Color
Hue
Brightness
Hue
Brightness
Set to
Yes
Making a color to change at an event
PM20A can change the display colors to get user attention e.g. when an alarm is triggered.
Each reading (and tag) can have two alternative colors in addition to the normal color, e.g. for a
warning and an actual alarm, or for lower and upper alarms.
To use:
Page 15 - Using the display
1. Prepare a rule for the color change i.e. some register that changes its value when the color
should change. Typically this can is an alarm comparator on a relay card. You may also use one
Function for this purpose (use Greater or Less function, see PM10 system manual).
2. Go to the Alm1 submenu under the relevant Page/Row/Left or Page/Row/Right menu.
3. Set Src to refer to the rule prepared in step 1. E.g. to Slot D/Alm1 or This/Func1.
4. If the Local color setting is Yes, define the alarm color with Hue and Brightness. Otherwise the
color defined under Display/Colors/X/Alm1 will be used as the alarm color.
5. If you want another rule, do the same tricks for Alm2 submenu.
6. If you want the reading (or tag) to blink at alarm, set Blink to Yes in the same menu where the
color is defined (locally or globally).
If both Alm1/Src and Alm2/Src are alarming, Alm2 will win.
Using a dimmer
PM20A allows controlling the display brightness from various sources, typically from an external
potentiometer or control voltage, but it is also possible to use a setpoint for this. To use the dimmer:
1. Prepare the controlling signal. Some examples:
a. Set up an analog input in a PM10UNI2A card and scale it to 0-100.
b. Use the analog input in the PM10POW24SA card; it will measure raw volts. Use a Table
or a Function to convert the reading to 0-100.
c. Set up a Setpoint as described on page 18. Use lower limit 5 or so to prevent total
darkness, and upper limit 100.
d. Use the front panel Ambient light sensor (page 21). Set up a Table to shape its output to
optimal dimmer response.
2. Go to the display card configuration menu, then to Display menu.
3. Set the Dimmer setting to refer to the controlling signal, e.g. Slot A/In1 or This/Setp1 or
This/Table1.
To disable the dimmer, set the setting to None.
The dimmer will adjust the whole display. If you need to control the brightness or color of a single item,
you may use Agents (see PM10 system manual).
Page 16 - Using the display
Configuring the page indicators
As said in “Display contents and pages” on page 8, the
leftmost indicators can be used to indicate which
page is being displayed. It is possible to assign up to 5
leftmost indicators to this task.
When a single indicator is not enough to express the page number, PM20A will use multiple indicators
together. The user obtains the page number by summing the number values next to the indicators. E.g.
4+5 = 9.
If the page number is too high to be expressed with the channel indicators, all of them will be off.
Select the number of channel indicators with the Indicators/Channel indicators setting. Value 0 disables
them all.
Configuring and using the fault indicator
The PM10 display is continuously querying the other
cards if they have any problems. If any of them reports
any problems or faults, the Fault indicator will be on.
When this happens, use the Fault viewer to see the problem description as guided on page 28.
It is possible to adjust the sensitivity of the fault indicator. It can also be released for other use. This is
controlled with the Indicators > Fault indicator setting, that have the following options:
Off
The Fault indicator is not used. Can be used for other purposes with the Ind8 menu.
Suspicion
The fault indicator is on if any card reports a suspicion of a problem.
Warning
The fault indicator is on if any card reports a warning or a suspicion. A warning means
everything is working, but problems are foreseeable. This is the factory default.
Failure
A failure means that the device has detected a problem that could possibly be fixed by
the user, like a sensor fault.
Fault
A fault means that the device has detected a problem in itself, possibly needing service.
System
A system fault is something that compromises the operation of the whole device, e.g.
power supply overload.
Using the indicators for other purposes
The indicators that are not used as channel indicators nor as a fault indicator, can be configured to
indicate various events. To configure an indicator:
1. Under Indicators menu, there is a submenu for each indicator, e.g. Ind6. The leftmost indicator
is Ind1 and the rightmost is Ind8.
2. Set the Count setting to match the number of “reasons” why the indicator can be on.
3. For each Src, select a source, e.g. an alarm or an alarm group. If any of the sources is on, the
indicator will be on.
Selecting the color for the indicators
The color for the indicators is selected in the Indicators/Color menu. Hue and brightness are explained
on page 14. It is not possible to have individual colors for each indicator.
Page 17 - Using the display
Attention light
The front panel has a bright red light for gathering
attention. The location of the light is marked in the
picture on page 7. The light is controlled by one or
more registers. When active, the light will blink to get
maximum attention.
To use the attention light:
1. Go to the configuration menu, Attention submenu.
2. Set Count to the amount of source registers, i.e. the number of “reasons” why the light would
be active. Up to four reasons can be used.
3. Corresponding amount of Src settings will be revealed. Set each of them to point to some
register, e.g. an alarm on a relay card.
To draw attention when there is some fault recognized by PM20A, set one of the Src settings to the
AnyFault register (page 21).
Protecting the configuration with a password
It is possible to prevent unauthorized persons from adjusting the settings in the configuration (and
quick configuration) menu. To do so:
1. Go to the General submenu.
2. Set Conf code. It is a series of six keypresses <v^> (viewed on the front panel) or a series of
numbers 1 to 4, e.g. 112234. In Mekuwin, it is possible to enter six letters; they will be converted
to numbers. The password can’t be <<<<<< = 333333.
3. When anyone tries to enter the configuration menu, he must enter the correct password.
The correspondence between the numbers (Mekuwin) and the keys (front panel):
1 ^ 2 v 3 < 4
>
This password applies to the display card only. The other cards may provide a password protection of
their own.
If the display password is forgotten, it must be reset as follows:
1. Power off the device.
2. Keep < pressed down.
3. Switch on the power.
4. is displayed shortly. Now release the key and enter the menu.
Conf
Master
Display
Setpoints
Indicators
Tables
Totalizers
...
Count
Src1
Src2
Src3
Attention
Page 18 - Using the display
Allowing the user to interact: The setpoints
The setpoints turn the “output” nature of the display to “input” from the user. The user may use the
keys to adjust the setpoint values, affecting the operation of PM20A in various ways. The setpoints in
this context are not directly related to alarms or controllers. They are merely something the user may
easily adjust. They do nothing more by themselves, but provide the value for the other functions.
PM20A provides different types of setpoints for different uses.
Event setpoint is “on” while the user keeps the * key pressed. It can be used to tare, reset an
alarm hold, and similar momentous activities.
Boolean setpoint can be toggled “on” and “off” with the * key. It can be used to start and stop
some activity.
Float setpoint is a user-adjustable floating point number with configurable limits. The setpoint
can adjust an alarm level, controller set value, affect the operation of an Elo program, etc.
ListIndex setpoint allows the user to select one item from a configurable list. The setpoint
output is the index of the selection, beginning from 0.
FloatList setpoint allows the user to select one number from a configurable list. The setpoint
output is the numerical value of the selected item.
StringList setpoint allows the user to select one string (a word) from a configurable list. The
setpoint output is the selected string.
To configure a setpoint, open the Setpoints menu, and then one of the Setp submenus, e.g. Setp1.
Configure it:
Type
See the explanations above.
Min
Max
The limits for the Float setpoint.
List
The user-selectable options for the list type setpoints. Enter the options separated
by linefeeds (enter key).
Preserve
If Yes, the value of the setpoint is retained when the device is powered off.
Startup
The value of the setpoint after power-up. If Preserve=Yes, this does not affect,
except if the stored value gets corrupted.
For a boolean setpoint, the value should be 0 or 1.
For any of the list setpoints, the value should be the 0-based index of the item.
Value
This is the value of the setpoint. With the float setpoint, the value can also be set
here.
The setpoint needs to be “made visible” in some of the display pages. Under the Display menu, select
one of the Page submenus (increase the Trunk setting to get more pages if necessary) and configure:
Tag
Some letters to describe the purpose of the setpoint. E.g. SV.
Src
Select Reg > Master > Setp1 (or which setpoint you did configure).
In Tandem mode, only the right half (Src) may have a setpoint, not the left half
(LSrc).
Dec
For a float setpoint, this defines the resolution along with the number of decimals
to show. Do not select unnecessarily many numbers, as it makes it slow to adjust
the value.
For the other setpoints, this setting does not matter.
Page 19 - Using the display
If it is not acceptable that anyone can adjust the setpoints, set a password in Setpoints > Code. The
user must enter it before adjusting a setpoint. Once entered, the setpoints are unlocked for 60 seconds.
The setpoint is ready for use. Move to the newly configured page on the display. Push * and the
following should happen:
With an event setpoint, an * is displayed as far as the * key is being pushed.
With a boolean setpoint, the displayed value toggles between * (on) and – (off).
With a float setpoint, the value begins to blink. Adjust the value with the v^ keys. The speed
accelerates if the keys are held pressed. When the desired value is reached, push *. The value
stops blinking and the v^ keys can be used to move among the pages again.
With any of the list setpoints, the value begins to blink. Select the desired option with v^ keys
and push *.
If there are several setpoints on a display page, push * repeatedly until the desired setpoint is blinking.
Don’t place other setpoints on a page that has an event or a boolean setpoint.
The value of the setpoint is available in the Setp1…Setp8 registers on the master card.
Page 20 - Using the display
Having auxiliary pages
The trunk pages are arranged vertically – the user may move between them with the v^ keys.
Sometimes it may be convenient to have a horizontal motion too. E.g. when viewing a page that
contains an input reading, the user might want to see its peak hold value, or adjust an alarm level or a
controller set value. These can be accomplished with auxiliary pages. The user pushes > to move an
auxiliary page associated with the original page. The Aux setting on each page is used to define to
which page to go if the user pushes >. If Aux is 0, there are no (further) auxiliary pages, and the user will
return to the trunk. If the user will not touch the keys in one minute, the trunk page will be displayed.
The PM20A display has 18 configurable pages. Some of the first pages (e.g. pages 1 to 4) are used in the
trunk, but the rest are free to be used as auxiliary pages.
To set up an auxiliary page (an example):
1. In one of the trunk pages, say Page1, set Aux=10 (or any unused page outside the trunk).
2. Configure the Page10 to contain a peak hold value. Set its Src to a function that is configured as
a peak hold. Enter a short description, e.g. “PK” in the Tag.
3. To chain another auxiliary page, set Aux=11 in page 20.
4. Configure the Page11 to contain a setpoint (configured elsewhere). Src=Reg > This > Setp1.
Configure an alarm to use this setpoint as its externally controlled level (ExtLevel).
Page1
Src=Reg>Slot A>In1
Aux = 10
Page2
Src=Reg>Slot A>In2
Aux = 0 (not used)
Page3
Src=Reg>Slot B>In1
Aux = 0
This is the
trunk
v^
v^
Page10
Src=Reg>This>Func1
Aux = 11
Page11
Src=Reg>This>Setp1
Aux = 0
> > >
This is a branch, consisting of auxiliary pages
When in one of the auxiliary pages, the channel indicators (if used) will blink and indicate the
corresponding trunk page. In the example above, the channel indicator 1 will blink when the user is in
the branch.
Page 21 - Using the display
Ambient light sensor
The front panel includes a coarse non-calibrated ambient light sensor. The result is available in the
Amblight register. The reading varies from 0 to 100.
The light sensor may be used as a temporary input when testing the PM10 functions. The reading may
be affected by covering the sensor with a finger.
It is possible to control the display brightness according to the ambient light. Configure the Dimmer
setting to follow a Table, and the table to follow Amblight, and set suitable table points to generate
values 0 to 100.
Temperature sensor
The display board has a temperature sensor. It is not accurate, especially as it is inside the enclosure
near heat-generating components. But it may be used for demo purposes and very coarse temperature
measurement like an overheating alarm. Its output, in °C, is available in the Temperature register.
AnyFault register
The display board continuously queries all the cards (including the display itself) if they have any
problems. This serves two purposes:
1. The Fault indicator is light if problems are found.
2. The AnyFault register contain the result as well as a truth value (no/yes). It can be used to
control a relay or a digital output for simple remote monitoring.
Page 22 - Configuring the device using the front panel
Configuring the device using the front
panel
The device can be configured with the Mekuwin software, or using the front panel display and keys. This
chapter instructs the latter.
Each PM10 card, including the display card, is an independent “device” performing its tasks.
Consequently, each card has a configuration menu of its own.
Actually each card has two configuration menus. The full configuration menu (Conf) contains all the
setting and unleashes all the power of the card. For reduced complexity, each card has also a Quick
configuration menu (QConf) that provides the most basic settings only. If you want a panel meter that
measures a couple of inputs, displays the readings and retransmits the values with an analog signal,
you can set them up using the quick configuration menu. Both menus are operated similarly, just select
either Conf or QConf on the menu. The contents of the quick configuration menus are described in the
PM20A quick manual.
Beginning a configuration session
Slot A
Slot D
Slot E
Slot C
Master Display
Setpoints
Indicators
Tables
Totalizers
Funcs
^
v
* 1 sec
Regs
Faults
Info
>
QConf
>
<
<
Conf Trunk
Tandem
Auto fill
Page1
Page2
Tag
Src
Dec
Alarm
Aux
Page3
>
>
Setp1
Setp2
Setp3
Setp4
Undo
Save
<
Enter the Main
menu with
*
.
Use v^ to select
Conf (or Qconf)
and push >.
Select the card
and push >.
You are now in the
Conf menu of the
selected card.
Navigating in the menu
The graph shows the truncated menu of the display (Master) as an example. The manual of each card
depicts the menu structure of that card. The display rows are used as follows:
The top row has the name of the menu where you are.
The middle row has the menu item name that is being viewed or edited.
The bottom row has the value of the item.
Page 23 - Configuring the device using the front panel
Display
Setpoints
Indicators
Tables
Totalizers
Funcs
*
Trunk
Tandem
Auto fill
Page1
Page2 Tag
Src
Dec
Alarm
Aux
Page3
>
>
Edit the
value
Setp1
Setp2
Setp3
Setp4
Use v^ to move
within a menu.
^
v
Push > to enter a
submenu.
Submenu of a
submenu
Push * or > to
edit a setting
value.
*
When done, push
* to return to the
menu.
<
Always use < to
return to the
parent menu.
Undo
Save
<
<
Moving in the menu Editing the value
While moving, the
middle row is
bright and
blinking, telling
where you are.
When editing the
value, the bottom
row is bright and
blinking.
Editing a value
The configuration menus contain different types of settings, each being edited differently as detailed
below. Common practices:
Use v and ^ to edit the value.
Use < and > to move the cursor.
Long-press * to see a pop-up menu, that provides additional options.
Exit with *.
Type
Examples
How to edit
On/Off or
Yes/No
Tandem setting in
the display
Use v and ^ to select. Exit with *.
List
Sensor selection
Use v and ^ to select. Exit with *.
Integer
Number of
decimals to show
Serial bus address
Use v to decrease and ^ to increase. Keep pressed for acceleration.
Advanced:
Use < and > to move the cursor.
Long-press * for a pop-up menu. Min = the smallest allowed value.
Max = the largest allowed value. Zero = zero value. Exit with *.
Floating
point
(decimal)
number
Input and output
scalings
Use v to decrease and ^ to increase the number at the cursor. Keep
pressed for acceleration.
Use < and > to move the cursor. Push the cursor against the edges
of the display to reveal more digits if necessary.
Long-press * for a pop-up menu. Zero = reset the value to 0. Negate
= toggle the sign.
Exit with *.
Page 24 - Configuring the device using the front panel
Type
Examples
How to edit
Reference
The source of an
analog output
The source of the
reading of a
display page
The references are explained below this table.
Text
(string)
Display tag
Setpoint lists
Use < and > to move the cursor. Push against the edges to scroll.
Use v and ^ to edit a character. If lost, long-press * and select N to
get capital N, a good starting point for any letter.
To truncate the string (discard the end including the cursor
location), long-press * and select End.
To insert a linefeed, as required when entering the setpoint lists,
long-press * and select Linefeed. The linefeed is displayed as ⸥ in
the editor.
The left edge of the middle row of the display indicates the location
of the cursor as a number. 1 means you are editing the first
character. The middle row has also the character code in
hexadecimal, e.g. 41 corresponds to capital A.
Password
(code)
Configuration
password
To set: Push *. The cursor blinks. Push six times the arrow keys to
enter the password. The password can’t be <<<<<<.
To disable: Push * twice. The bottom row says Off.
Page 25 - Configuring the device using the front panel
Editing a reference
The references are used to link the different, autonomous blocks of the system together. E.g. for an
analog output, the source must be configured, as the output may follow various sources (called
registers) from any of the cards. Similarly, the display contents are configured to come from
somewhere. These are done with a reference to an output register of some card. The reference consists
of three parts: 1) Whether the reference is active or not. 2) The card, or slot, producing the referred
register. 3) The register within the selected card.
To select a reference:
*
None
Reg
In2
CJ
Master
Slot C
Slot D
Slot E
v
>
>
<
<
Slot A
Select the slot
(card) and push >.
Select the
register.
In1
Exit with *.
PM20 confirms
”Stored”.
If the reference
was None, you
will begin here.
Select Reg and
push >.
Stored
If the reference was
already selected, you will
begin here.
Use < to change
the slot.
Sometimes it is necessary to “switch off” a reference. E.g. an unused analog output is disabled by
selecting None as its source. A display page containing a tag only is achieved by setting Src to None. To
switch off a reference, push < twice and select None (picture below), or long-press * and select None.
Reg
In2
CJ
Master
Slot C
Slot D
Slot E
^
<<
Slot A In1
None
*
Stored
2. Push < twice.
3. Select None and
push *.
1. You will
begin here.
Ending the configuration session
When all is done,
exit the conf
menu with <.
Select Save to keep
the changes, or Undo
to discard.
Slot A
Slot D
Slot E
Slot C
Master
Display
Setpoints
Indicators
Tables
Totalizers
Funcs
Regs
Faults
Info
QConf
<
Conf
Undo
Save
<
Select another
slot or exit with <.
<
<
Trunk
Tandem
Auto fill
Page1
Page2
Page3
Setp1
Setp2
Setp3
Setp4
Page 26 - Using the USB port
Using the USB port
A micro USB port is available at the back of PM20A. It can be used for configuring the device with the
Nokeval Mekuwin configuration software. The information below applies to PM20ADISP firmware V1.0.
When connected to a computer, PM20A appears as a virtual COM port, accepting Modbus RTU
commands. Technically the port is connected to the display card (Master).
To prepare the port for configuration purposes on a Windows computer:
1. Obtain the PM10 USB driver from Nokeval web site, under Support > Software and drivers.
Unzip it to some temporary folder.
2. Plug in PM20A. Windows tries to find a driver from Windows Update but fails.
3. Open the Device Manager (e.g. press Windows+R and type devmgmt.msc).
4. Locate PM10, with a yellow exclamation mark.
5. Right-click PM10 and select Update driver.
6. Point to the directory where the unzipped driver is.
7. Accept the warning. The downloaded driver is just a simple text file; the actual driver usbser.sys
is included in Windows already.
8. Check that there is a PM10ADISP Virtual port under the Ports branch of the Device manager.
Then:
1. Launch Mekuwin (available for free at www.nokeval.com).
2. Select the virtual port.
3. Select ModbusRTU protocol, and address 1. (The parity and baud rate should not matter, but
use 115200 and 8E1 if having issues.)
4. Use the Master, A, B… E buttons to open a configuration session for each card.
Page 27 - Functions, tables, Elo…
Functions, tables, Elo…
For processing the input signals and to allow tuning the device for many tasks, the display card
provides the following configurable operational blocks:
Functions take one or more inputs and do some simple operation on them, like subtracting two
inputs.
Tables allow entering several points to form a curve to shape a non-linear input to linear or
other similar tasks.
Totalizers cumulate the input value, allowing to calculate the mass of substance flown based
on a flow measurement.
Elo is a minimalist programming language allowing conditional execution, calculation, and
timing.
Agents allow linking some of the configuration settings to the functional blocks, varying them
without using the configuration menu.
These blocks are common to many PM10 family cards. That’s why they are explained in the PM10
system manual.
Page 28 - Maintenance
Maintenance
The device doesn’t need regular maintenance. The analog input and output cards can be recalibrated,
when maximum accuracy is desired.
Now and then check that the fault indicator is not on.
The enclosure, including the front panel, may be cleaned with a moist cloth. Use mild soap water or
isopropyl alcohol. Never allow water to go inside.
Troubleshooting
Problems
Problem: The Fault indicator is on (the rightmost indicator ).
Solution: Use the Fault viewer as described on page 29.
Problem: The configuration menu can’t be entered with *.
Solution: The display page may contain an Event setpoint. Try *+^.
Problem: The display is blank.
Solution: Enter the configuration menu or the quick configuration menu. Check that there is at least
one display page defined (under Master > Display) that has a tag or a reading. Check that the color
settings under Master > Display > Colors > Normal are valid (brightness is >10).
Problem: Now and then the display dims for a moment.
Solution: There are short dips or interruptions in the supply voltage. Enhance the quality of the
supply.
Seeing information about the cards
To see what kind of cards have been installed and their serial numbers and firmware versions, use the
Info viewer:
1. Long-press * key until a menu appears. (If not, try ^ and * together.)
2. Select Info with v^ and push > or *.
3. The top row has a word “Info” plus a letter indicating which card (slot) is being examined. *
means the display card. Use < and > to change the card.
4. The middle row indicates the type of information to be shown. The options are listed below.
Use v and ^ to change.
5. The bottom row displays the information, e.g. card type.
6. To exit, push * and you are back in the main menu.
The information available:
Type: Card type, e.g. PM10UNI2A.
Ver: Firmware version, e.g. V1.0.
SN: Serial number, e.g. P091201
Descr: Short description of the purpose of the card, e.g. Dual analog input.
Page 29 - Troubleshooting
Viewing fault messages
To see if any card has detected a problem, use the Fault viewer:
1. Long-press * key until a menu appears. (If not, try ^ and * together.)
2. Select Faults with v^ and push > or *.
3. The bottom row may have a message, accompanied with a letter indicating the card slot. E.g. “A
Sensor 1 break” means that the card in the slot A reports a sensor problem.
4. Use v^ to see if there are more messages.
5. Exit with < <.
Some common fault messages:
Source unavailable: some card can’t get the value from the linked source. E.g. if an analog
output in slot B has been configured to use slot C as its source and there is no card in slot C, this
message will appear.
Sensor fault or overrange: an analog or sensor input is exceeding its range or the sensor is
found to be faulty or incorrectly connected.
Conf corrupted: the checksum of the configuration data stored in a non-volatile memory does
not match. Check all significant settings on that card and exit by saving. If the problem
reappears later, the non-volatile memory has failed and needs to be replaced.
Cal corrupted: the factory calibration data has been found to be corrupted. It is best to send the
card to be checked and recalibrated.
Viewing the registers
The cards provide their readings and other values for the other cards. These
“outputs” are called registers. The principle is explained in detail in the PM10 system
manual. For troubleshooting, it is possible to view all the registers:
1. Long-press * key until a menu appears. (If not, try ^ and * together.)
2. Select Regs with v^ and push > or *.
3. Select the card (slot) to view with v^ and push > or *.
4. Select a register with v^; its name appears on the middle row.
5. View the value on the bottom row.
6. To exit, push <.
Page 30 - Specifications
Specifications
Environmental
Storage temperature -40…+70 °C
Operating temperature -30…+70 °C
Humidity, front panel 0…100 %RH
Humidity, rear 5…90 %RH non-condensing
Pollution degree, rear 2
Altitude 0…2000 m when hazardous voltages involved,
unlimited otherwise
Protection, front panel IP 65
Protection, rear IP 20
Dimensions and weight
96
96
105
6 10
Panel opening IEC 61554 (92.0 +0.8 -0.0 mm each side)
Digit height 14 mm
Weight 300 g without the optional cards
Page 31 - Warnings
Warnings
The device must not be disposed with household waste. Observe local regulations
concerning electronic waste recycling.
Manufacturer
Nokeval Oy
Rounionkatu 107
FI-37150 Nokia
Finland
Tel +358 3 342 4800 (Mo-Fr 8:30-16:00 EET)
WWW http://www.nokeval.com/
Email sales@nokeval.com,
support@nokeval.com
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