Logitech Electronics 200 MKII Series User manual

200 MKII SERIES™
Counters
Model 200C
User Guide!

Contents
Specification . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 3
General description . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 4
Special applications and customised functions . . . . . . . . . . . . . . . .4
Safety information for EU users . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 5
Transformer connections (230V/115V AC selection) . . . . . . . . . . . . . . . 5
Switches and connections . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Switch A . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .6
Switch B . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Mains Earth . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
DC Power Supplies . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 6
Rear panel terminals . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 7
Programming the instrument . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Calculating a scaling factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
Increasing the discrimination of the display . . . . . . . . . . . . . . . . . . 8
Setting a scaling factor . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 8
— On an instrument that has not been previously scaled . . . . . . . .8
— On an instrument that has been previously scaled . . . . . . . . . . .9
Operation . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Counting . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Adjustment of input signal sensitivity . . . . . . . . . . . . . . . . . . . . . . . 10
Power failure and stored count . . . . . . . . . . . . . . . . . . . . . . . . . . . . 10
Diagrams . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 11
Front & rear panel layout . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . .11
Connection diagrams — typical applications . . . . . . . . . . . . . . . . . 12
Additional information . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Electromagnetic Precautions . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 14
Low Voltage Directive . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
Warranty . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . . 15
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Specification
Display 4 decade 7-segment high brightness red LED, 14mm high
Decimal point Programmable via display board
Scaling Programmable via display board, retained in non-volatile memory.
Signal inputs
Standard (Count Up and Count Down)
Standard sensitivity 180mV to 10V- protected to 100V
Frequency Mode 0—100kHz maximum
Impedance 15kΩminimum
Optional
High sensitivity version 12mV to 1V — protected to 100V
Analogue input module (specified as 0–1V, 0–5V, 0–10V, 0–20mA, 4–20mA)
Control inputs Stop (SP) and Reset (RS)
Opto-isolated — require sink to 0V of 220Ωmaximum)
Outputs
Standard Transducer supply 10V DC nominal unregulated @ 80mA max
Optional Higher transducer supply voltage 24V DC @ 50mA max
Connections Screw terminals on rear panel.
Power requirement
AC Factory set to 115V or 230V AC 50/60 Hz, loading 3VA.
DC Mains Counters can also be powered by providing 10V to 15V DC @
250mA max via the 10V terminal. Alternatively, if specified at time of
order, they can be configured to operate from 24V DC only (refer to DC
Supplies on page 6).
Temperature range
Operating 0°C to +50°C
Storage -20°C to +80°C
Dimensions 96 x 48 x 110mm (panel cut-out 92 x 43mm).
Weight 400g (standard mains supply version)
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General description
200C MKII series™ Counters are 4-decade seven segment high brightness red LED display
instruments based on the industry standard Intel 80C51 series microprocessor. They are built into
half DIN (96 mm x 48 mm) panel mounting housings and can be supplied to operate on 115V or 230V
AC or 24V DC power supplies (see Transformer connections on page 4).
The circuitry is protected against mains-borne interference offering excellent noise immunity for
maximum reliability. The integral scaling factor allows conversion of the input pulse train to
engineering units such as mm or litres etc. Independent positioning of the decimal point gives
flexibility of presentation of displayed units.
Special applications and customised functions
200 MKII SERIES™Counters are available with factory fitted options which must be specified when
ordering, see Specification section for details. Additionally, Logitech will customise the operating
modes of these Counters to suit specialised applications. Many variations on the standard software
have been developed; please contact our Sales Office if this service is required.
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Safety Information for EU Users
WARNING This instrument must be earthed when powered from a mains supply (see also Mains
Earth on page 6). Refer to the rating label for the pre-set voltage and ensure that the instrument
voltage corresponds to the intended supply voltage.
Important: The wires in the power lead fitted to mains instruments are coloured in accordance with
the following code:
Green and Yellow . . . . . . . . . . . . . Earth
Blue . . . . . . . . . . . . . . . . . . . . . . . Neutral
Brown . . . . . . . . . . . . . . . . . . . . . . Live
As the colours of the supply lead fitted to mains supply instruments may not correspond with the
coloured markings identifying the terminals in your plug, connections should be made as follows:
• Connect the green and yellow wire to the terminal marked with the letter E or identified with the #(earth) symbol.
• Connect the blue wire to the terminal marked with the letter N or coloured black.
• Connect the brown wire to the terminal marked with the letter L or coloured red.
The mains supply to this instrument must be protected with a 1 Amp fuse.
Transformer connections
200 MKII SERIES™instruments for use on mains power can operate on either a 230V or 115V 50/60Hz
AC supply.
Instruments are factory pre-set to operate from the mains voltage specified at time of ordering.
If, for any reason, the user needs to change the mains operating voltage the following procedure
must be adhered to:
1. Disconnect the Mains Supply.
2. Gently prise off the front panel bezel surround and allow the front panel to fall forward
and out.
3. Remove the four screws in the rear of the case, then gently pull the instrument out
from the rear. The display board will be pulled away from the main board and fall
forwards.
4. Pads which select the operating voltage are located on the under side of the printed
circuit board. The existing link(s) should be removed and new link(s) should be soldered
across the appropriate pads, and the instrument re-assembled (one link is used for 230V
AC, two links are needed for 115V AC).

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Switches and connections
200 MKII SERIES™instruments are available only with hidden function switches that are not accessible
until the bezel and front panel are temporarily removed. The programming instructions in this User
Guide assume that the front panel has been removed to gain access to these switches – see Fig 1
on opposite page.
Switch A and Switch B
These switches are located to the left and right of the display respectively. When the instrument is in
RUN mode and both switches are held down simultaneously the instrument is put into SET mode
(see Setting a scaling factor on page 8). Whilst in SET mode switch Ais then used to step to each
decade in turn so that the value programmed can be altered by using switch B.
In SET mode, switch Asteps through the parameters in the following sequence:
When the required program parameters have been entered, switch Amust be held down and switch
Bpressed twice to put the instrument into RUN mode ready for operational use.
Mains Earth
200 MKII SERIES™Counters supplied to operate on mains power (115V or 230V AC) are fitted with a
three core mains cable. The Earth is normally connected by an internal link to 0V. For applications
where it is found that the mains earth is of poor quality, or when it is essential that the signal input is
floating, it may be necessary to remove this link. In these cases, the user must determine the most
appropriate method of earthing the instrument and may need to remove the internal connection — if
this is found to be necessary please refer to our Sales Office for advice.
(See also Safety Information for EU Users on page 5 and Electromagnetic Precautions on page 13).
DC Power Supplies
Mains-powered Counters can be powered instead by feeding 10V to 15V DC into the 10V terminal on
the rear panel as long as there is no power on the 3-core mains cable. If you wish to use this facility
you must ensure that the supply is free from transient interference.
Alternatively, if specified at time of order, Counters can be configured to operate straight from a
nominal 24V DC supply (16V to 30V DC) via a 2-core cable (leaving the 10V terminal free for
operator use). 24V Tachometers should be connected to a supply protected with a 500mA fuse.
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1.
Scale
(Scaling factor)
2.
Decimal point
(for Scaling factor)
3.
Decimal point
(for final display)

Rear panel terminals
1
10V
+10V DC (unregulated) @ 80mA
2
A2
Not used on standard counter
3
A1
Not used on standard counter
4
0V
Common
5
CU
Count Up
6
CD
Count Down
7
0V
Common
8
RS
Reset (the display and stored count)
9
SP
Stop (the count)
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Programming the instrument
Calculating a Scaling Factor
The scaling factor in the 200 MKII SERIES™Counter is straightforward to calculate. For example, if for
each fifteen (15) pulses received you want the display to increment once, the scaling factor should be
set to fifteen (15). Similarly, if for each pulse received you want the display to increment by ten (10)
then a scaling factor of 0.1 should be set.
The function is where Dis the displayed value, xis the total number of input pulses and
sis the scaling factor.
The Scaling Factor range is 0.001 to 9999 and it may be necessary to round off the calculated value
to fit within this range.
Once a scaling factor has been set it is retained in memory upon power down. When power is
reinstated the unit will immediately be ready for operation without need for a reset command.
Increasing the discrimination of the display
Once you have calculated the required scaling factor it may be advantageous to increase the
discrimination of the display. This can be achieved by moving the decimal point when setting the
scaling factor.
For example in a system where metres need to be displayed and where twenty (20) pulses = one (1)
metre the scaling factor would be twenty (20). If this factor was used the display would indicate
metres only. The discrimination can be increased by setting a scaling factor of 0.2 (effectively
multiplying the input pulses by five) and then altering the position of the displayed decimal point to
00.00 - this will increase the discrimination by a factor of 100. The display would now show up to
99.95 metres.
Setting a scaling factor
On an instrument that has not been previously programmed
Unless requested otherwise, Counters are normally supplied from the factory with all settings
programmed to zero.
On power up for the first time the display will show SET …. 0000 (.... signifies a one second delay
before the display changes) with the least significant decade blinking and the instrument will be in the
SET mode awaiting programming.
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D x s=

To enter the scaling factor, simply press Switch B to alter the value for the decade that is blinking
until the correct figure is displayed. To move to the next highest decade in turn just press Switch A to
move from right to left.
If it is necessary to enter a decimal point in the scaling factor you must use Switch A to step to the
most significant decade (even if the value for the higher decades is to remain at zero) and then press
Switch A once again to move on to the decimal point setting function.
At this point the decimal point will start to blink to show that you have reached this stage of the
scaling procedure. The decimal point should then be positioned as required by use of Switch B. At
this stage, each press of Switch B will move the decimal point one decade to the left.
If you want the display to show a decimal reading during normal operation (e.g. 15.75) you must
now set the position at which the decimal point must appear in the displayed reading. To do this,
press Switch A once and the display will change to show - - - - As when moving the decimal point in
the scaling factor, each press of Switch B will move the decimal one decade at a time from right to
left. With this example, after pressing the switch twice the display will now show - - . - -
Once the Counter has been programmed, to return to the RUN mode hold Switch A depressed and
momentarily press Switch B twice, then release Switch A. The instrument is now ready for
operation and the display will show 0until enough pulses are received that equate to the minimum
displayed value.
Note that leading zeroes are suppressed, so with the above example where a decimal reading to two
places is required, the display will start at 0.00
On an Instrument that has been previously scaled
Program factors are stored in non-volatile memory. Therefore if a Counter has been supplied with
factory programmed settings as requested, or once the user has programmed the settings and
returned the instrument to the RUN mode, on power-up the display will show zero. In this case, to
access the SET mode press and hold down both Switch A and Switch B at the same time (see Fig 1
on page 11) until the display changes to show SET, then release the buttons. The display will
change to show the current setting and the units decade will be flashing, you can now programme in
the new scaling factor and decimal point position as in section 1.
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Operation
Counting
Once a scaling factor has been set and the unit is in RUN mode the display will increment each time
the requisite number of pulses are received (either up or down dependent upon which input receives
the signal).
The count can be reset to zero at any time by momentarily connecting the reset (RS) input on the
back panel to 0V (see Fig 2 on page 11). The count can also be halted by connecting the stop (SP)
input to 10V. Once halted the count must be reset to zero before operation can be started again.
One or two input signals can be connected, these can be on CU for counting up or CD for counting
down, or on both (for example to deduct count of product diverted down a reject line).
▪If the count up input is used, the instrument will increment the displayed count until it has filled
all the decades. After reaching 9999 the next increment will cause the display to read High.
▪If the count down input is used, the instrument will decrement the display until -999 is
reached. The next decrement will cause the display to read lo.
Any input signals that are received once either of these conditions have occurred will not be stored.
If this situation arises the counter must be reset (via the RS control on the rear terminals) before
operation can continue.
Adjustment of input signal sensitivity
The input signal sensitivity level is factory pre-set. However, if necessary (e.g. if a different type of
sensor is fitted) adjustment of sensitivity is with a potentiometer accessible via a hole in the panel to
the right of the terminal block – see Fig 2 on page 11.
Maximum sensitivity is obtained when the control is turned fully clockwise, but it is recommended that
the sensitivity level is increased only as far as necessary to obtain a steady signal; this minimises the
risk of detecting spurious signals. Additionally, too high a setting can result in saturation of the signal
with high output sensors.
Note that only one sensitivity level can be set and this is common to both input signals.
Power Failure and Stored Count
In the event of a power failure, the stored count will be retained and displayed again when power is
restored, but any pulses received after the power failed will be lost.
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Diagrams
Fig.1 Front Panel Layout
To access Switch A and Switch B remove the bezel and front panel
Fig. 2 Rear panel layout
Sensitivity Control
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Connection diagrams – typical applications
Single-input operation
Dual-input operation
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10V A2 A1 0V 0V
BAM2 M1
Sens
A
Magnetic Pick-up
Gear wheel
or
flowmeter
screen Black
Red
10V A2 A1 0V 0V
BAM2 M1
Sens
A
B
Gear wheels or flowmeters
Magnetic Pick-ups
screens
Red
Black

Additional Information
Electromagnetic Precautions
Logitech have designed in a great deal of noise immunity into the product in accordance with
EN5001-2 and EN5002-2 (radiated emissions, conducted emissions, ESD, radiated susceptibility and
fast burst transient testing)
However it is still vital to use good EMC (Electromagnetic Compatibility) techniques on installation of
both this and other associated electronic equipment and sensors in order to ensure reliable
operation.
It is important to note that if used with systems that radiate high levels of harmonic noise such as DC
Drives, AC Inverters and Servo Drives then the levels of imposed interference can greatly exceed
that of the European Standards.
In such cases it is important to ensure that mains leads are routed as far as possible from all cables
carrying power to such equipment and that the supply should, if viable, be taken from a clean source.
Where this is not possible, it is advisable to use a good quality mains filter mounted as close to the
instrument as possible, ensuring that the cable between the filter and the instrument is kept separate
from any cables carrying high levels of current or any fast switching transients.
All signal connections to the instrument should be made using screened lead with the screen
connected to mains earth at one end only.
Wherever possible, it is advisable to connect the 0V terminal to mains earth and therefore
instruments are normally shipped with this connection in place.
The exceptions to this are if it is found that the mains earth is of poor quality or when it is essential
that the signal input is floating.
In these cases, the user must determine the most appropriate method of earthing the instrument and
may need to remove the internal connection — if this is found to be necessary please refer to our
Sales Office for advice.
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Low Voltage Directive
It is essential that the mains supply to the instrument is fused externally to no more than 1A and that
the cabling supplying power to the instrument is rated for at least 3A.
Low voltage signal cables should not be run in the same conduit or twisted or tied to cables carrying
voltages in excess of 50V (AC or DC).
If the instrument is not installed fully in accordance with the instructions in this User Guide it may not
comply with the requirements of the Low Voltage Directive.
Warranty
200C MKII SERIES™Counters carry a two year warranty that is only valid where there is no damage
caused by accident, negligence, misapplication, or repairs/modifications attempted by unauthorised
personnel. The warranty only extends to the original user.
Copyright © Logitech Electronics Limited
1994 to 2017
Document No: 200C-MKII_hb v3.0 August 2017
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