Motrona AX 342 User manual

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AX 342
Process Indicator with 2 Analogue Inputs,
2 Presets, Relay Outputs and
Serial RS232 / RS485 Interface
Two analogue inputs with independent scaling, each +/- 10V or 0/4 –20 mA
Operating modes for display of input A or input B or the combinations
[A + B], [A - B], [A x B] and [A : B]
Useful supplementary functions like Tare function, programmable averaging
functions, programmable linearization etc.
Aux. output 24 V DC / 100 mA for sensor supply
Operating Instructions

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Safety Instructions
This manual is an essential part of the unit and contains important hints about
function, correct handling and commissioning. Non-observance can result in
damage to the unit or the machine or even in injury to persons using the
equipment!
The unit must only be installed, connected and activated by a qualified electrician
It is a must to observe all general and also all country-specific and application-
specific safety standards
When this unit is used with applications where failure or mal-operation could cause
damage to a machine or hazard to the operating staff, it is indispensable to meet
effective precautions in order to avoid such consequences
Regarding installation, wiring, environmental conditions, screening of cables and
earthing, you must follow the general standards of industrial automation industry
- Errors and omissions excepted –
General instructions for cabling, screening and grounding can be found in the
SUPPORT section of our website http://www.motrona.com
Version:
Description:
AX34209a/tj/hk/05_2011
First edition

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Table of Contents
1. Introduction..........................................................................................................................................4
2. Electrical Connections..........................................................................................................................5
2.1. Power supply ................................................................................................................................6
2.2. Aux. voltage output ......................................................................................................................6
2.3. Analogue measuring inputs..........................................................................................................6
2.4. Relay Outputs ...............................................................................................................................6
2.5. Serial RS232 / RS485 interface (AX 348 only).............................................................................7
3. Jumper settings ...................................................................................................................................8
4. How to Operate the Keys ...................................................................................................................10
4.1. Normal display state ..................................................................................................................10
4.2. Parameter settings .....................................................................................................................11
4.3. Teach operation..........................................................................................................................12
4.4. Set all parameters to “Default“ .................................................................................................12
4.5. Code Locking of the Keypad.......................................................................................................12
5. The Parameter Menu .........................................................................................................................13
5.1. Overview of Basic Parameters: ..................................................................................................13
5.2. Overview of Operational Parameters.........................................................................................14
6. Setting of Parameters ........................................................................................................................ 15
6.1. Basic Parameters........................................................................................................................15
6.2. Operational parameters..............................................................................................................16
6.3. Modes of operation ....................................................................................................................17
6.4. Additional settings for the Preselections and Relays................................................................20
6.5. Parameters for the Serial Interface............................................................................................23
7. Commissioning...................................................................................................................................27
8. Special Functions...............................................................................................................................28
8.1. Tare / Offset function .................................................................................................................28
8.2. Linearization ...............................................................................................................................28
8.3. Manual input or „Teaching“ of the interpolation points ...........................................................30
8.4. Overflow and Underflow Control ...............................................................................................32
9. Technical Appendix............................................................................................................................33
9.1. Parameter Lists...........................................................................................................................33
9.2. Dimensions .................................................................................................................................35
9.3. Technical data ............................................................................................................................36
9.4. Commissioning Form ..................................................................................................................37

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1. Introduction
Some of the general demands to an up-to-date process controller for automation industry are
always high flexibility, combined with easy and simple operability.
Many applications require two separate analogue inputs for use with single or combined
operation.
Also it may be important to display and evaluate both, linear and non-linear analogue inputs at
an acceptable accuracy, which requires programmable linearization functions.
Process controllers of series AX 342 have been designed for this kind of requirements.
Moreover, these units also provide 2 programmable presets with relay outputs and a serial
RS232 / RS485 interface.

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2. Electrical Connections
Terminal assignments and wiring example
GND
17-30VCDIN
1 2 3 4 5 6 7 8 9 10
InputA
+24VDCOUT
TXD/B(-)
RXD/A(+)
GND
GND
1 2 3
1 2 3
X1 X2
X3
C NO NC
C NO NC Rel. 1
Rel. 2
GNDanalogue
InputB
Rel. 2
Rel. 1
TxD
RxD
GND
+
-
A
B
C
NC
NO
C
NC
NO
*)
RS232
Sensor 1
Sensor 2
*) Contact positions are shown in powerless state

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When earthing any of the GND terminals, please be aware that all terminals marked
GND or AGND will be earthed.
Multiple earthing on different positions of an installation may cause problems,
especially with poor overall performance of the whole earthing and screening system!
The minus potential of analogue inputs is internally connected to the minus of the DC
supply. When you like to loop current signals through several units, it is therefore
necessary to supply each unit from a separate, potential-separated DC source.
2.1. Power supply
The unit operates from a DC power with 17 to 30 VDC applied via terminals 1 and 2. The
consumption depends on the level of the supply voltage (typical 80 mA at 30V or 130mA at 17V,
plus current taken from the aux. output).
2.2. Aux. voltage output
Terminal 7 provides an auxiliary output of 24 V DC / 100 mA max. for supply of sensors and
encoders. This voltage is independent from the level of the input voltage.
2.3. Analogue measuring inputs
There are two analogue inputs with common minus potential available (Input A and Input B).
Both refer to the AGND potential of terminal 5 which is internally connected to terminals 1, 6
and GND.
The analogue inputs can be configured for voltage input (+/- 10 V) or current input
(0/4 –20 mA) by means of internal jumpers.
Ex factory, both inputs are always configured for current input.
(see section 3 for jumper settings)
2.4. Relay Outputs
The two output relays provide individually programmable switching characteristics. It is
recommended to use additional filter components for external coils when switching inductive
loads. The switching capability of the dry relay contacts is either 250 VAC / 1 A / 250 VA
or 100 VDC / 1 A / 100 W
The relays operate with a typical delay time of 60 ms (see chapter Fehler! Verweisquelle
konnte nicht gefunden werden.)

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2.5. Serial RS232 / RS485 interface (AX 348 only)
Ex factory the unit is set to RS232 communication. This setting can be changed to RS485
(2-wire) by means of an internal DIL switch. To access the DIL switch, you must remove the
screw terminal connectors and the backplane. Then pull the board to the rear to remove the
PCB from the housing.
ON
DIL-Switch
Removal of the back plane
Location of the DIL switch
Never set DIL switch positions 1 and 2 or DIL switch positions 3 and 4 to “ON”
at the same time!
After setting the switch, shift the print carefully back to the housing and avoid
damage of the front pins for connection to the front keypad plate.
2
3
5
RxD RxD
TxDTxD
GND
Screen
PC
AX 342 9
(Sub-D-9)
10
8
Connection of the RS232 interface
PLC
AX 342 9
10
A(+)
B(-)
A(+)
B(-)
Connection of the RS485 interface

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3. Jumper settings
When your input signal is a current of 0-20 mA or 4-20 mA, there is no need to change jumper
settings and you can skip this section.
Where however you intend to use one or both inputs for voltage signals, you must change the
internal jumper settings correspondingly.
To access the jumpers, you have to disconnect the rear screw terminal strips, remove the back
plane from the unit and pull the PCB out of the housing
=jumper inseredscrew terminal strip
locking tab
factory preset
A=current, B =current
A = voltage, B = voltageA = voltage, B = currentA = current, B = voltage
A
(mA) (V) B
(mA) (V)
A
(mA) B
(mA)
A
(mA) (V) A
(mA) (V)
A
(mA) (V)
B
(mA) (V) B
(mA) (V)
B
(mA) (V)
A
(mA) A
(mA)
A
(mA)
B
(mA) B
(mA)
B
(mA)
Wrong jumper settings may cause serious damage to the unit!
After setting the jumpers, please shift the print carefully back to the housing, in order not
to damage the front pins for connection to the keypad plate.

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Current inputs are automatically scaled to an input range of 0/4 –20 mA.
Voltage inputs use the standard range of +/- 10V.
You are free to measure voltages up to 120 volts DC by use of a remote resistance in series to
the input line (please observe applicable safety standards!). You can calculate the value from
the formula
Rx [ k] = 3 x Vx [ V ] - 30
R = resistance value
V = input voltage
Example: Desired input = 100 volts:
R = [ 3 x 100 ] –30 (k) = 270 k
With regard to the scaling procedure described later, the new maximum input with resistance
will work like a 10 volts signal with no resistance

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4. How to Operate the Keys
The unit uses 3 front keys for all setup operations. Subsequently, the key functions will be
named as shown in the table below.


ENTER
SET
Cmd
(Command)
The functions of the keys are depending on the actual operating state of the unit.
The following three operating states apply:
Normal display state
Setup state
a.) Basic setup
b.) Operational parameter setup
Teach operation
4.1. Normal display state
You can change over to the other states while the unit is in the normal display state only.
Change over to
Key operation
Basic setup
Keep ENTER and SET down simultaneously for 3 seconds
Operational
parameter setup
Keep ENTER down for 3 seconds.
Teach operation
Keep SET down for 3 seconds
The Cmd key is only used for execution of the Tare function, the Reset function and for
Teaching the interpolation points for linearization (see section 8).