Mect MPNC006 Series User manual

ME7084_05
07/21
User Manual
MPNC006 series
Modbus RTU interface
MANUALE D’USO

RTU Modbus interface : MPNC006 Mect srl
ME7084_05 07/21

RTU Modbus interface : MPNC006 Mect srl
1
ME7084_05 07/21
INDEX
INDEX...........................................................................................................................1
1Introduction ...........................................................................................................3
1.1 Staff qualification .............................................................................................3
1.2 Symbols.............................................................................................................3
1.3 Nomenclature....................................................................................................3
1.4 Security.............................................................................................................4
2Hardware Installation............................................................................................4
2.1 System description............................................................................................4
2.2 Features.............................................................................................................5
2.3 Installation ........................................................................................................7
2.3.1 Distances .................................................................................................7
2.3.2 Insertion and removal of components.....................................................7
2.3.3 Assembly sequence .................................................................................7
2.3.4 Proprieties of DIN rail and TBUS..........................................................8
3MPNC006 Wiring .................................................................................................9
3.1 Power supply.....................................................................................................9
3.1.1 Isolation...................................................................................................9
3.1.2 System power supply ..............................................................................9
3.1.3 Digital outputs power supply................................................................10
3.1.4 Fuses......................................................................................................10
3.1.5 Grounding..............................................................................................10
3.1.6 Cable screen ..........................................................................................10
3.2 The daisy chain...............................................................................................11
3.3 I/O Connection................................................................................................11
3.3.1 Analog input connection .......................................................................12
3.3.2 Digital inputs Connection.....................................................................12
3.3.3 Digital outputs connection ....................................................................13
3.4 Max Configuration..........................................................................................13
3.5 Modbus parameters configuration..................................................................14
3.5.1 Address (ID module).............................................................................14
3.5.2 Baud Rate settings.................................................................................15
3.5.3 Parity and stop bit configuration..........................................................16
3.5.4 Reset Configuration...............................................................................18

RTU Modbus interface : MPNC006 Mect srl
2
ME7084_05 07/21
3.6 ModBus Connection.......................................................................................18
3.7 Installation example TPAC1007 / TP1043.....................................................19
3.8 Installation example TPAC1008 / TP1070.....................................................20
3.9 Terminating resistence....................................................................................20
3.10 Watchdog.....................................................................................................21
4RTU ModBus registers map...............................................................................21
5Status led .............................................................................................................26
5.1 On Led ............................................................................................................26
5.2 Run Led...........................................................................................................26
5.3 Overflow/configuration Led...........................................................................26
5.4 Digital I/O Led................................................................................................27

RTU Modbus interface : MPNC006 Mect srl
3
ME7084_05 07/21
1Introduction
To ensure a quick installation of the device please follow carefully the information
given in this manual.
1.1 Staff qualification
Products described here are to be used exclusively by personnel with experience in
programming PLCs, or technician specialized in the use of electrical device for
automation. MECT S.r.l. declines any responsibility for malfunctions or damages
caused by improper use of MECT devices, due to the non-compliance with
information in this manual. In MECT S.r.l there is an help desk service.
1.2 Symbols
Danger
Follow these advices to avoid people injury.
Warning
Follow these advices to protect the device.
Caution
Follow this advice to have a more effective performance.
ESD (Electrostatic discharge)
Danger: possibility of components damage due to electrostatic
discharge
Note
Steps to follow for a correct installation
Additional informations
1.3 Nomenclature
Modbus RTU interface: MPNC006
Terminals: MPNC020; MPNC030; MPNC035
Operator Panel: TP1070
System: MPNC006 with terminals
TBUS: Internal bus for communication between MPNC006
and terminals

RTU Modbus interface : MPNC006 Mect srl
4
ME7084_05 07/21
1.4 Security
Attention
Switch off devices before connecting them .
Attention
MPNC006 must be mounted inside cabinet or electrical
switchboards whose access must be performed by qualified
personnel.
ESD (Electrostatic discharge)
Modules have electronic components that can be damaged by
electrostatic discharge. Be sure to be connected to ground when
handle the devices.
The instrument has no power switch and no internal fuse, but it powers on
immediately after the correct supply voltage has been supplied (check the value of
the supply voltage indicated on the instrument label under “Supply”). Provide a
power supply line as direct as possible and separate from the line that supplies the
power elements.
For safety regulations, it is necessary to provide a two-phase switch-disconnector
with fuse located near the instrument and easily replaceable.
Avoid the presence of power elements (contactors, motors, drives, etc.), excessive
humidity, heat sources and corrosive gases in the same panel.
Instruments must be powered by safety transformers or by SELV-type power
supplies.
2Hardware Installation
2.1 System description
The MPNC006 is a RTU Modbus bus coupler device. The device interfaces on an
internal bus with terminals for different types of signals, both digital and analog.
The RS485 ModBus/RTU slave interface allows the MPNC006 to communicate with
an operator panel for displaying PLC variables.
Analog and digital terminals (MPNC020; MPNC030; MPNC035) can be connected
to the MPNC006; communication between the terminals and the MPNC006 via an
internal bus called TBUS.

RTU Modbus interface : MPNC006 Mect srl
5
ME7084_05 07/21
2.2 Features
Table 1
Mechanics
Materials
Polycarbonate, Polyamide 6.6
Power supply
24Vdc +/-15% 3W
Dimensions W x H x L
22.5 mm x 108 mm x 115 mm
Installation
DIN 35
Environmental conditions
Operative temperature
0 °C ... 55 °C
Storage temperature
-20 °C ... +85 °C
Relative humidity
From 5 % a 95 % no condensation
Electric isolation
Air clearance
According to IEC 60664-1
Pollution according to IEC 61131-2
2
Degree of protecion
IP 20
Digital inputs
Input range 0V - 24Vdc +/- 15%
Max current for every digital output
500mAdc@24 Vdc
Analogue input number
2
Analogue input type
mA, V, PT100, TC: J, K, T, B, R, S
Power
2.0 W
Analog
inputs
N° 2
Input type
Resolution
Note
020 mA
0.005mA
Input impedance 9Ω
0V
0.003V
Input impedance 1M
Thermocouple:
J (0°C –600°C)
T (0°C –400°C)
K (0°C –800°C)
B (100°C –1800°C)
R (0°C –1500°C)
S (0°C –1700°C)
1°C
Cold junction
compensation
PT100 E:
-40°C +800°C
1°C
Degree resolution
PT100 r:
-40°C +200°C
0.1°C
Tenth of degree resolution
Configurable
Digital I/O
N°8
PNP
PLC cycle
time
Max 200mA for each
output. 2 A max all output.

RTU Modbus interface : MPNC006 Mect srl
6
ME7084_05 07/21
Electromagnetic Compatibility
The electromagnetic compatibility tests have been carried out at accredited
laboratories, according to EN 61326-1, EN 61131-2 and EN 61000-6-2standards.
Attention
Install the devices in electrical switchboards where temperature
doesn’t exceed 55 °C.
Dimensions
Figure 1: Dimensions

RTU Modbus interface : MPNC006 Mect srl
7
ME7084_05 07/21
2.3 Installation
2.3.1 Distances
The system must be installed in a way that there is enough space for heat dissipation
and cabling. Avoid cables superimposition to prevent EMC problems.
Figure 2
2.3.2 Insertion and removal of components
Attention
Before performing these operations make sure that devices are
not supplied.
2.3.3 Assembly sequence
The insertion or removal of a single terminal is carried out by acting on the
fastening hook to the DIN rail located at the base of the terminal itself as shown in
the figure. The sequence starts with the insertion of the MPNC006, then the
necessary terminals are inserted in sequence. The fixing to the DIN rail is
guaranteed by the hooking spring of each terminal.
Adding terminals Removing terminals
Figure 3: Insertion or removal of a terminal

RTU Modbus interface : MPNC006 Mect srl
8
ME7084_05 07/21
The instruments must be assembled on the TBUS with the sequence shown in the
figure.
Figure 4: Assembly
2.3.4 Proprieties of DIN rail and TBUS
All the modules must be hooked directly onto DIN rail of type EN 50022 (DIN 35)
on which the TBUS connection modules have been inserted, which creates the
internal communication bus between the Modbus RTU interface (MPNC006) and
terminals.
Figure 5: TBUS

RTU Modbus interface : MPNC006 Mect srl
9
ME7084_05 07/21
3MPNC006 Wiring
3.1 Power supply
3.1.1 Isolation
There are no galvanic isolation zones.
Figure 6: logical wiring scheme
As you notice from the figure, on the MPNC006 there are no zones that create an
isolation between the main power supply and the internal bus (TBUS). Only on each
terminal has an isolation barrier been created which allows the masses of each
terminal to be separated from one another.
3.1.2 System power supply
The MPNC006 requires a 24VDC (±15%) power supply as shown in the figure. The
system is protected from the power supply polarity inversion.
Before turning on the device configure the Modbus setting , see chapter: Modbus
parameters configurations
Figure 7
Attention
wrong value for the power supply can cause a damage to the
device.

RTU Modbus interface : MPNC006 Mect srl
10
ME7084_05 07/21
3.1.3 Digital outputs power supply
The digital outputs of the MPNC006 can provide up to 2A maximum current at 24V.
The maximum allowable current per single output is 500mA. The current supplied
by the outputs is supplied by the power supply of the terminal itself: it is the
responsibility of the installer to correctly size the power supply to guarantee the
necessary current.
Figure 8
3.1.4 Fuses
The system has no fuses internally; however, for the protection of the input of the
MPNC006 power supply, it is recommended to insert a 1 A fuse, while for the
power it is necessary to put a 2,5A.
3.1.5 Grounding
The DIN rail on which are mounted the MPNC006 and the terminals must be
carefully grounded in order to increase the rejection of electromagnetic
disturbances.
3.1.6 Cable screen
To make the system less sensible to disturbances , the connection cable between the
operator panel and the MPNC006 should be screened and connected to both devices
GND.

RTU Modbus interface : MPNC006 Mect srl
11
ME7084_05 07/21
3.2 The daisy chain
The communication between the modules take place through a chain that propagates
from the MPNC006 till the last terminal. Make the connection as shown in the
figure.
Figure 9: Daisy chain wiring
3.3 I/O Connection
The MPNC006 can be used either alone or connected to a series of MPNC-series
terminals and connected via Modbus to a graphical terminal.
On MPNC006 are available:
8 Input –Output configurable via software
2 Universal analogue inputs configurable via software
The figure below shows the terminal blocks for the connections on the MPNC006.
Figure 10: Connections

RTU Modbus interface : MPNC006 Mect srl
12
ME7084_05 07/21
3.3.1 Analog input connection
The following figure shows the connections required to use the temperature sensors
and analog inputs to the MPNC006.
Figure 11: Analog inputs
3.3.2 Digital inputs Connection
If configured as inputs, the digital lines are PNP type.
Figure 12: Digital inputs

RTU Modbus interface : MPNC006 Mect srl
13
ME7084_05 07/21
3.3.3 Digital outputs connection
If configured as outputs, the digital lines are PNP type.
Figure 13: Digital outputs
ATTENTION: bring the 24VDC to terminal 2 of the black terminal block.
3.4 Max Configuration
The number of terminals that can be connected to the MPNC006 is limited by the
internal bus line, practically they can be connected to the most:
4 MPNC020-01 (digital inputs)
4 MPNC020-02 (digital outputs)
4 MPNC030 (analogue inputs)
4 MPNC035 (analogue outputs)
For a total of:
64 digital inputs
64 digital outputs
16 analogue inputs
16 analogue outputs
In addition, the MPNC006's own inputs/outputs must also be taken into account
which are: 2 analog inputs and 8 configurable digital lines.

RTU Modbus interface : MPNC006 Mect srl
14
ME7084_05 07/21
3.5 Modbus parameters configuration
The 8-position dip-switch is used to change the baud rate, the address on the
MPNC006 and the stop and parity bit.
Figure 14: Modbus parameters configuration
3.5.1 Address (ID module)
The address is set using switches 3to 8, so the valid addresses are 1 to 63.
It is important that the address setting is carried out before the
MPNC006 is turned on because one of the first operations carried out at
the turn-on is the reading of the DIP status and if it detects that the
address is zero it signals the error condition the four flashing LEDs.
The address is coded according to the following table:
S-3
S-4
S-5
S-6
S-7
S-8
ID node
0
0
0
0
0
0
Input in configuration
0
0
0
0
0
1
1
0
0
0
0
1
0
2
0
0
0
0
1
1
3
0
0
0
1
0
0
4
…
1
1
1
1
1
0
62
1
1
1
1
1
1
63
To set 1 on the DIP switch, the switch must be set to the ON side.

RTU Modbus interface : MPNC006 Mect srl
15
ME7084_05 07/21
Figure 15: Node address settings (ID)
Turn the device off and on again to make the changes effective.
3.5.2 Baud Rate settings
On the MPNC006 you can set 4 different baud rates. The baud rate is set via the DIP
switches 1 to 2. The permitted baud rate values are shown in the following table.
Switch settings
Baudrate
S-1
S-2
0
0
9600
0
1
19200
1
0
38400
1
1
57600
Figure 16: Baud rate setting
Turn the device off and on again to make the changes effective.

RTU Modbus interface : MPNC006 Mect srl
16
ME7084_05 07/21
3.5.3 Parity and stop bit configuration
If at the start the address dips (module ID) are all zero, the procedure for
reading/setting the configuration of the stop, parity and data bits is accessed.
The selection of the configuration type is made by reading dips 1and 2.
In this condition the LED_On flashes.
Switch settings
Configuration
S-1
S-2
0
1
Parity bit
1
0
Stop bit
Depending on the type of configuration chosen, dips 1 and 2 select the configuration
to be programmed.
Parity bit: S1=0; S2=1
Procedure:
- Set all dip switches to 0 except dip 2;
- Power up the instrument;
- Wait a few seconds until the LED_On flashes;
- Carry out the desired programming (see below);
- Set dip 2 to 0 and wait for the LEDs: Run, Ain1 and Ain 2 to light up;
- Switch off the instrument;
- Set the Baud rate and the desired address;
- Power up the instrument.
As long as dips 3 to 8 are at 0, the LEDs LED_Run, LED_Ain1 and LED_Ain 2
indicate the current parity configuration according to the following table:
Configuration
LED
LED_Run
LED_Ain1
LED_Ain 2
No parity
ON
OFF
OFF
Even Parity
OFF
ON
OFF
Odd parity
OFF
OFF
ON

RTU Modbus interface : MPNC006 Mect srl
17
ME7084_05 07/21
The parity programming is done by setting:
Dip settings
Configuration
S-7
S-8
0
1
No parity
1
1
Even Parity
1
0
Odd parity
To save the configured value, bits S1 and S2 must be set to OFF.
Stop bit: S1=1; S2=0
Procedure:
- Set all dip switches to 0 except dip 1;
- Power up the instrument;
- Wait a few seconds until the LED_On flashes;
- Carry out the desired programming (see below);
- Set dip 1 to 0 and wait for the LEDs: Run, Ain1 and Ain 2 to light up;
- Switch off the instrument;
- Set the Baud rate and the desired address;
- Power up the instrument.
As long as dips 3 to 8 are at 0, the LEDs LED_Run, LED_Ain1 and LED_Ain 2
indicate the current stop configuration according to the following table:
Configuration
LED
LED_Run
LED_Ain1
LED_Ain 2
1 stop bit
ON
OFF
OFF
2 stop bit
OFF
ON
OFF
The stop programming is done by setting:
Dip settings
Configuration
S-7
S-8
0
1
1 stop bit
1
0
2 stop bit
To save the configured value, bits S1 and S2 must be set to OFF.
ATTENTION: It is not possible to set the "data bit" differently from the 8 bits as the
Modbus RTU protocol requires data in this format.

RTU Modbus interface : MPNC006 Mect srl
18
ME7084_05 07/21
3.5.4 Reset Configuration
If at the start all the dips are at 0, it is possible to restore the configuration to the
default values, the LEDs LED_On, LED_Run, LED_Ain1 and LED_Ain 2 are
flashing until the bits from S3 to S8 are brought to 1.
This causes the device to be configured as:
Stop bit: 1
No parity
To activate the default configuration it is necessary to turn ON all bits from S3
to S8.
3.6 ModBus Connection
The ModBus interface on the MPNC006 is a 2-wire RS485 serial port, built on
removable terminals.
Figure 15: ModBus serial port