Akytec MK210-312 User manual

akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
MK210-312
Digital I/O-Module
12 DI, 4 DO
User guide
MK210-312_2022_05_42468-1.11_EN
© All rights reserved
Subject to technical changes and misprints

akYtec GmbH · Vahrenwalder Str. 269 A · 30179 Hannover · Germany · Tel.: [phone] · www.akytec.de
1
Contents
1. Introduction.....................................................................................................................................................3
1.1 Terms and abbreviations .........................................................................................................................3
1.2 Symbols and key words...........................................................................................................................3
1.3 Intended use ............................................................................................................................................3
1.4 Limitation of liability..................................................................................................................................4
1.5 Safety.......................................................................................................................................................4
2. Overview..........................................................................................................................................................5
2.1 Basic features ..........................................................................................................................................5
2.2 Design and indication ..............................................................................................................................5
3. Specifications .................................................................................................................................................7
3.1 Specification tables..................................................................................................................................7
3.2 Operating conditions................................................................................................................................8
4. Configuration and operation .........................................................................................................................9
4.1 Connection with akYtecToolPro ..............................................................................................................9
4.1.1 Connection over USB ..........................................................................................................................9
4.1.2 Connection over Ethernet ....................................................................................................................9
4.2 Real-time clock ......................................................................................................................................10
4.3 Battery....................................................................................................................................................11
4.4 Ethernet .................................................................................................................................................11
4.4.1 Network parameters setting using service button..............................................................................12
4.5 Modbus Slave ........................................................................................................................................12
4.6 Device status .........................................................................................................................................12
4.7 Data logging...........................................................................................................................................12
4.8 Digital inputs ..........................................................................................................................................13
4.8.1 Debounce filter...................................................................................................................................14
4.8.2 Low frequency counter ......................................................................................................................14
4.8.3 High frequency counter......................................................................................................................15
4.8.4 Frequency / period measuring ...........................................................................................................15
4.8.5 Encoder..............................................................................................................................................15
4.9 Digital outputs ........................................................................................................................................15
4.9.1 Output safe state ...............................................................................................................................16
4.9.2 Output diagnostic ...............................................................................................................................16
4.10 NTP protocol ..........................................................................................................................................17
4.11 MQTT protocol .......................................................................................................................................17
4.11.1 Basics ............................................................................................................................................17
4.11.2 Implementation ..............................................................................................................................17
4.12 SNMP protocol.......................................................................................................................................19

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4.12.1 Basics ............................................................................................................................................19
4.12.2 Implementation ..............................................................................................................................19
4.13 Password ...............................................................................................................................................20
5. Installation.....................................................................................................................................................21
5.1 Mounting ................................................................................................................................................21
5.2 Wiring.....................................................................................................................................................21
5.2.1 General information ...........................................................................................................................22
5.2.2 Digital inputs ......................................................................................................................................22
5.2.3 Digital outputs ....................................................................................................................................24
5.2.4 Ethernet .............................................................................................................................................24
6. Factory settings restoration........................................................................................................................26
7. Maintenance..................................................................................................................................................27
8. Transportation and storage.........................................................................................................................28
9. Scope of delivery..........................................................................................................................................29
Appendix A. Dimensions ..................................................................................................................................30
Appendix B. Galvanic isolation........................................................................................................................31
Appendix C. Battery replacement ....................................................................................................................32
Appendix D. Modbus application.....................................................................................................................33

Introduction
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1. Introduction
1.1 Terms and abbreviations
akYtecToolPro – configuration software
Modbus – application layer messaging protocol for client/server communication between devices
connected on different types of buses or networks, originally published by Modicon (now
Schneider Electric), currently supported by an independent organization Modbus-IDA
(https://modbus.org/)
NTP – Network Time Protocol
MQTT – Message Queuing Telemetry Transport, publish-subscribe network protocol to transport
messages between devices
SNMP – Simple Network Management Protocol, an Internet Standard protocol for collecting and or-
ganizing information about managed devices on IP networks and for modifying that infor-
mation to change device behavior
PWM – pulse-width modulation
RTC – real-time clock
UTC – Coordinated Universal Time, world-wide primary time standard
1.2 Symbols and key words
WARNING
WARNING indicates a potentially dangerous situation that could result in death or serious inju-
ries.
CAUTION
CAUTION indicates a potentially dangerous situation that could result in minor injuries.
NOTICE
NOTICE indicates a potentially dangerous situation that could result in
damage to property
.
NOTE
NOTE indicates helpful tips and recommendations, as well as information for efficient and trou-
ble-free operation.
1.3 Intended use
The device has been designed and built solely for the intended use described here, and may only be used
accordingly. The technical specifications contained in this document must be observed.
The device may be operated only in properly installed condition.
Improper use
Any other use is considered improper. Especially to note:
– The device may not be used for medical appliances applied to maintain human life or health, its con-
trol or other effect on them.
– The device may not be used in explosive environment.
– The device may not be used in atmosphere in which there are chemically active substances.

Introduction
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1.4 Limitation of liability
Our company does not bear any responsibility with respect to breakdowns or damages caused by using the
product in a manner other than described in the Manual or in violation of the current regulations and tech-
nical standards.
1.5 Safety
WARNING
Ensure the mains voltage matches the voltage marked on the nameplate.
Ensure the device is provided with its own power supply line and electric fuse.
WARNING
The device terminals may be under a dangerous voltage. De-energize the device before
working on it.
Switch on the power supply only after completing all works on the device.
NOTICE
Supply voltage may not exceed 48 V. Higher voltage can damage the device.
If the supply voltage is lower than 10 V DC, the device cannot operate properly but will
not be damaged.
NOTICE
If the device is brought from a cold to a warm environment, condensation may form in-
side the device. To avoid damage to the device, keep the device in the warm environment
for at least 1 hour before powering on.

Overview
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2. Overview
MK210-312 is an extension module with 12 digital inputs and 4 relay outputs.
The module operates as a slave in Ethernet network with Modbus TCP protocol.
The device is intended for use in industrial automation for creation of decentralized control systems.
The module can be configured with the configuration software akYtecToolPro (free) over USB or Ethernet
interface (Sect. 4). The software can be downloaded from our homepage akYtec.de.
2.1 Basic features
– 12 passive digital inputs (24 VDC) with counter function (Sect. 4.8)
– 4 relay outputs with pulse-width modulation option (Sect. 4.9)
– Device and I/O status indicators (Sect. 2.2)
– Open load and relay malfunction detection (Sect. 4.9.2)
– Dual Ethernet (Sect. 4.4, 5.2.4)
– Slave in Modbus network over Ethernet (Sect. 4.5)
– USB configuration interface (Sect. 4.1.1)
– Real-time clock (Sect. 4.2)
– Device diagnostic (Sect. 4.6)
– Data logging and archiving (Sect. 4.7)
– Error indication (Table 2.1)
– DIN rail or wall mounting (Sect. 5.1)
2.2 Design and indication
The device is designed in a plastic case for DIN rail or wall mounting (Sect. 5.1).
Plug-in terminal blocks enable quick and easy replacement of the device.
Fig. 2.1. Front view (closed cover) Fig. 2.2. Front view (open cover)

Overview
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On the device top:
1. Power supply terminals
2. 2 Ethernet connectors (Sect. 4.4, 5.2.4)
On the front cover:
3. LED indicators (Tab. 2.1)
4. Recess for a sticker with IP address
Under the front cover:
5. I/O plug-in terminal block (Sect. 5.2)
6. microUSB programming connector (Sect. 4.1.1)
7. Service button
The service button can be used for the following functions:
−IP address assignment (Sect. 4.4.1)
−Factory settings restoration (Sect. 6)
−Firmware update (Sect. 7)
Fig. 2.3. Top view
Table 2.1. LEDs
LED
Color
State
Description
green
Off Power off
On Power on
Eth 1 green Off Not connected
Flashing Data transfer over Ethernet 1 interface
Eth 2 green Off Not connected
Flashing Data transfer over Ethernet 2 interface
red
Off No errors
On Program / configuration error
Flashing (0.2 s / 2 s period) Low battery (Sect. 4.3, App. C)
Flashing (0.1 s / 0.5 s period) No requests from master. Safe state activated.
Flashing (0.9 s / 1 s period) Hardware peripherals error (Flash, RTC,
Ethernet Switch)
Input LEDs
(12) green Off LOW on the input
On HIGH on the input
Output
LEDs (4)
green Off Output relay off
On Output relay on
red On Fault status (Sect. 4.9.2)

Specifications
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3. Specifications
3.1 Specification tables
Table 3.1 General specification
Electrical
Power supply
24 (10…48) V DC
Power consumption, max.
5 W at 24 V DC
Polarity protection
yes
Appliance class
II
Interfaces
Data transfer
Double Ethernet 10/100 Mbps
Protocols
Modbus TCP
MQTT
SNMP
NTP
Configuration interfaces
USB 2.0 (micro-USB)
Ethernet 10/100 Mbps
Digital inputs
Inputs
12
Input signal
Switch contact (24 VDC)
NPN transistor
PNP transistor
Functions
DI
1-DI2
Low frequency counter
Debounce filter (optional)
Period measuring (optional)
High frequency counter (optional)
Frequency measuring (optional)
DI
3-DI8
Low frequency counter
Debounce filter (optional)
Period measuring (optional)
High frequency counter (optional)
Frequency measuring (optional)
AB encoder (optional)
DI
9-DI12 Low frequency counter
Debounce filter (optional)
Pulse length, min.
DI1-DI8
5 ms (f ≤100 kHz)
DI9-DI12
1 ms (f ≤400 Hz)
Switching hysteresis
0.5 V
LOW level
current, max.
1.2 mA
voltage
0…6.1 V
HIGH level
current, max.
5.5 mA
voltage
8.8…30 V
Digital outputs
Outputs
4
Output type
Relay, NO
Control
On-Off or PWM
Switching capacity
AC
5 A, 250 VAC, resistive load
DC
3 A, 30 VDC
Switching current, min.
10 mA at 5 VDC
Switching time
15 ms
PWM frequency, max.
1 Hz with duty cycle = 0.05

Specifications
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PWM pulse length, min.
50 ms
Optional functions
Safe state
Output diagnostic
Service life, electrical
3 A, 30 VDC
35,000 switching cycles
5 A, 250 VAC
50,000 switching cycles
Service life, mechanical
5,000,000 switching cycles
Flash memory (log file storage)
File size, max.
2 kB
Number of files, max.
1000
Logging interval, min.
10 s
Real-time clock
Accuracy
±3 s/day at 25°C
±10 s/day at -40°C
Backup battery
CR2032
Mechanical
Dimensions
42 x 124 x 83 mm
Weight
approx. 260 g
3.2 Operating conditions
The module is designed for natural convection cooling. It should be taken into account when choosing the
installation site.
The following environment conditions must be observed:
−clean, dry and controlled environment, low dust level
−closed non-hazardous areas, free of corrosive or flammable gases
Table 3.2 Operating conditions
Condition Permissible range
Ambient temperature
-40…+55°C
Transportation and storage -40…+55°C
Relative humidity up to 95 % (at +35°C, non-condensing)
Altitude
up to 2000 m ASL
IP code IP20
Vibration / shock resistance conforms to IEC 61131-2
EMC emission / immunity conforms to IEC 61131-2

Configuration and operation
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4. Configuration and operation
The device parameters can be set with akYtecToolPro or by command from a network Master.
The complete parameter list is presented in Appendix D. You can also read it out from the device using the
toolbar item Parameter list in akYtecToolPro.
The modules of Mx210 series have the following parameter groups:
−Real-time clock (Sect. 4.2)
−Battery (Sect. 4.3)
−Network (Sect. 4.4)
−Modbus slave (Sect. 4.5)
−Device status (Sect. 4.6)
−Data logging (Sect. 4.7)
−I/O groups, depending on model (Sect. 4.8, 4.9)
4.1 Connection with akYtecToolPro
The connection with akYtecToolPro running on the PC can be established over the interfaces USB (Sect.
4.1.1) or Ethernet (Sect. 4.1.2).
For configuration over Ethernet, the device must be powered on. When being configured over USB, the de-
vice is powered by USB and the main power supply is not required.
4.1.1 Connection over USB
NOTICE
The device must be powered off before being connecting to PC over USB.
NOTICE
When the device is powered over USB, the inputs, outputs and the Ethernet interfaces are
disabled. If you need full control over the device, you have to connect the main power,
but you must observe the following:
There is no galvanic isolation between digital inputs and USB interface. Equipment con-
nected to these circuits must have the same ground potential or be galvanically isolated
to avoid damage to the device.
To configure the module over USB:
1. Connect the microUSB programming connector of the device (Fig. 2.2. Pos. 6) to PC over a USB-to-
microUSB connection cable (not included).
2. Start akYtecToolPro.
3. In a new project, click the toolbar item Add devices .
4. In an opened dialog, select the interface STMicroelectronics Virtual COM Port.
5. Select the protocol akYtec Autodetection Protocol.
6. Select Find device.
7. Enter the device address (factory setting: 1) and click Find.
8. If the correct device is found, select it and click the button Add devices to add the device to the project.
9. If the device is password protected, enter the correct password.
If you forgot the password, restore the factory settings (Sect. 6).
4.1.2 Connection over Ethernet
To configure the module over Ethernet:

Configuration and operation
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1. Connect the Ethernet connector of the device to PC over the Ethernet connection cable (not included).
2. Connect the power cable to the removable 2-terminal block and plug it into the device.
3. Power on the device.
4. Start akYtecToolPro.
5. Click the toolbar item Add devices.
6. In the opened dialog select the interface Ethernet.
7. Select Find device.
8. Enter the IP address (Factory setting: 192.168.1.99) and click Find.
9. If the correct device is found, select it and click the button Add devices to add the device to the project.
10. If the device is password protected, enter the correct password.
If you forgot the password, restore the factory settings (Sect. 6).
4.2 Real-time clock
The module has a real-time clock (RTC) with a back-up battery (Sect. 4.3). The RTC time is counted as UTC
in seconds, starting from 01/01/2000, 00:00.
To set the time, click the toolbar icon Real-time clock (Fig. 4.1).
Use the button Synchronize with PC to synchronize the RTC with the PC clock.
Select your time zone from the drop-down list below. You can also set the time zone in the range -720...+840
min. with a 60 min. step in the parameter group Real-time clock.
Use the button Save to save the parameters in the device memory.
Fig. 4.1. Real-time clock parameters
The RTC is used for calculation of measuring timestamps (Sect. 4.8.5) and of Time (ms) parameter.
Time (ms) is a cyclic time in milliseconds that starts with turning on and stops with turning off of the device. It
is reset to zero at the end of cycle (4294967295 ms). The parameter is used for device diagnostic purposes.
To set the RTC time over Modbus network, proceed as follows:
1. Write the new time in the parameter New time.
2. Set the parameter Apply new time = 1 and hold the value for at least 1 second.
3. Set the parameter Apply new time = 0 and hold the value for at least 1 second.

Configuration and operation
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The time value cannot be changed more than once per second.
4.3 Battery
The RTC is powered by the supply voltage. When the device is powered off, RTC is powered by a replacea-
ble battery of type CR2032.
A fully charged battery can power the RTC for 5 years. At the temperatures near the permissible limits (Tab.
3.2), the battery life time is reduced.
The parameter Voltage in the group Battery shows the battery voltage in mV.
The battery status is updated each time after powering on and then every 12 hours.
The battery should be replaced if at least one of the following events has occurred:
– LED indicator lights up for 0.2 s with a period of 2 s, which means that UB≤2 V and the battery
has to be replaced as soon as possible, but the RTC can still work for about 2 weeks without power
supply.
– The battery was last time replaced 6 years ago.
For battery replacement, see App. C.
NOTE
If the battery voltage is less than 1.6 V, the configuration parameters are written to the
battery-backed RAM and then transferred to the flash memory. The recording interval
depends on the load of the module processor (at least 2 minutes).
Since the number of erase cycles of the flash memory is limited, it is not recommended to
record the configuration parameters cyclically when the battery is low.
4.4 Ethernet
To configure the Ethernet interface, open the node Network > Ethernet in the parameter tree.
Table 4.1. Ethernet parameters
Parameter
Description
Default value
Access
IP address
IPv4 Internet Protocol address
192.168.1.99
R
Subnet mask
IP address recognition area in the subnet
255.255.255.0
R
Gateway
IP address of the gateway
192.168.1.1
R
DNS server 1
Primary DNS server
77.88.8.8
RW
DNS server 2
Secondary DNS server
8.88.8.8
RW
New IP address
Enter new value
−
RW
New subnet mask
Enter new value
−
RW
New gateway
Enter new value
−
RW
DHCP
On / Off / Service button
Service button
RW
The Ethernet parameters can be set using:
−only main toolbar
−service button on the device (recommended if you need to configure several devices at once) (Sect.
4.4.1.)
To change Ethernet parameters using the main toolbar:
1. Enter new values for the parameters New IP address, New subnet mask and New gateway
2. Set the parameter DHCP to Off
3. Click the toolbar item Write parameters
4. Click the toolbar item Restart device

Configuration and operation
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5. If you want to check the new parameters or continue configuring the device, you must add it again to the
project with the new network parameters.
If a dynamic IP address is required (e.g. to use a cloud service), set DHCP to On.
4.4.1 Network parameters setting using service button
If you need to assign IP addresses for several modules, it is more comfortable to use service buttons on
devices (Fig. 2.2. Pos. 7), previously having all the modules connected to the PC over Ethernet.
To change the Ethernet parameters using service buttons:
1. Connect all modules in series to the PC over Dual Ethernet ports (Fig. 2.3. Pos. 2)
2. Power on the modules
3. Start akYtecToolPro
4. Set the parameter DHCP to Service button on all modules
5. Click the toolbar item IP addresses
6. Set the IP address for the first module from the group
7. Press the service buttons on the modules sequentially, checking the result in the dialog box, where will
be indicated on which module the button was pressed. The specified static IP address and other network
parameters, if any have been changed, are assigned to this module. The address is automatically incre-
mented by 1 for each subsequent device.
Only Ethernet parameters will be changed, other parameters will not be affected.
If you forgot the IP address of the device, restore the factory settings (Sect. 6.).
4.5 Modbus Slave
The module can operate in Modbus TCP network as a slave, using the port 502 and the standard address 1.
The address can be changed in the group Modbus Slave (Tab. 4.2).
The device can handle maximum 4 Modbus TCP connections.
For details on Modbus working see Appendix D.
For Modbus protocol specifications see Modbus specifications.
Table 4.2. Modbus Slave parameters
Parameter Description Range
Default
value
Access
Slave address
Device address in a Modbus network
1...254
1
RW
Safe state timeout
Output safe state activation delay after communi-
cation interruption (Sect. 4.9.1)
0…60 s 30 RW
4.6 Device status
The parameters of the device status are in the group Device status in the parameter tree.
Table 4.3. Device status parameters
Parameter
Description
Range
Default value
Access
Update period
Status update time interval
1…60 s
5
RW
Status
32-bit status code
0…4294967295
−
R
4.7 Data logging
An archive is saved as a set of encrypted log files. A log file consists of a set of records separated by line
break characters (0x0A0D). Each record corresponds to one parameter and consists of fields separated by
semicolon. The format of the record is described in Tab. 4.4.

Configuration and operation
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Table 4.4. Record format
Field
Type
Size
Comment
Time
binary
4 Byte
In seconds, beginning from 01/01/2000, 00:00 (UTC+0)
Separator
string
1 Byte
Semicolon (;)
UID (parameter ID)
string
8 Byte
String of HEX characters with leading zeros
Separator
string
1 Byte
Semicolon (;)
Parameter value string
parameter
depending
String of HEX characters with leading zeros
Separator
string
1 Byte
Semicolon (;)
Parameter status binary 1 Byte
1 – value correct
0 – value incorrect, further processing not recommended
New line
binary
2 Byte
0x0A0D
Log files are stored in a built-in flash memory, formatted as a file system with encryption. For flash memory
specifications see section “Flash memory” in Table 3.1.
If an archive overflows, the new entry will overwrite the oldest one in the archive.
The archiving parameters are described in Tab. 4.5.
To view all logged parameters, use the toolbar item Device information in akYtecToolPro.
The archive can be read with via Modbus TCP using function 20 (Tab. D.3). This function allows reading one
or several records from one or several files in one request. For details on function usage see Modbus speci-
fications.
The file number in the Modbus request should be calculated as file ID + 4096. File indexing starts with zero.
The parameter Last log file ID contains the ID of the archive file to which the data was last written.
The time zone is not contained in the file but can be read from the parameter Time zone (Tab. D.1).
Table 4.5. Archiving parameters
Parameter
Description
Range
Default value
Access
Logging interval
Time interval with which the values of the
selected parameters will be recorded
10…3600 s 30 RW
Number of files
Maximum number of archive files
10…300
100
RW
File size
Log file size in Bytes
200…2048
2048
RW
Last log file ID
ID of the last written file
0…65535
−
R
4.8 Digital inputs
To configure the digital inputs, open the Digital inputs group in the parameter tree.
Table 4.6. Input parameters (DI1…DI8)
Parameter Description Range
Default
value
Access
Single
Debounce filter
Contact bounce suppression
filter (Sect. 4.8.1)
On / Off Off RW
Optional function Additional input function instead
of LF counter
Off / Period measuring /
High frequency counter /
Frequency measuring /
Encoder (DI3…DI8)
Off RW
Frequency measur-
ing interval
Frequency measuring interval
selection
10 ms / 100 ms / 1 s / 10 s 10 ms RW
Optional function
value
Value of LF counter or optional
function
- - R
Reset value
Force reset of LF counter or
On / Off
Off
RW

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Parameter Description Range
Default
value
Access
optional function value
Group
Input bitmask
Input state bitmask
0…63
-
R
Table 4.7. Input parameters (DI9…DI12)
Parameter Description Range
Default
value
Access
Single
Debounce filter
Contact bounce suppression filter
On / Off
Off
RW
Pulse counter value
LF counter value
0…4294967295
-
R
Reset value
Force counter reset
On / Off
Off
RW
Group
Input bitmask
Input state bitmask
0…63
-
R
Digital input detects the logical level of the input signal (0/1). This function is not affected by activation of an
optional function. The states of the inputs are stored as a bitmask (group parameter). The least significant bit
of the mask corresponds to the input DI1.
The selection of the optional input functions depends on the input type:
Debounce filter - all inputs (Sect. 4.8.1)
Low frequency counter - all inputs (Sect. 4.8.2)
High frequency counter - DI1…DI8 (Sect. 4.8.3)
Period measuring - DI1…DI8 (Sect. 4.8.4)
Frequency measuring - DI1…DI8 (Sect. 4.8.4)
Encoder (max. 3) - DI3…DI8 (Sect. 4.8.5)
4.8.1 Debounce filter
Debounce filter can be activated for each input by setting the parameter Debounce filter to On. The filter
fixed time is 25 ms.
It is not recommended to use the contact bounce suppression for input signals with a frequency above 20 Hz
and a duty cycle of 0.5 or less because a useful signal can be missed.
4.8.2 Low frequency counter
Each input has a 32-bit LF pulse counter that is active by default. If an optional function is selected, the
counter is inactive.
The counter can be used for pulses with:
−frequency ≤ 400 Hz
−pulse length ≥ 1 ms
Pulses of higher frequency or shorter length will be ignored.
The counter reacts to rising edge.
The counter resets to zero on overflow.
Forced counter reset via Modbus:
1. parameter Reset value = 0 (On), the counter will be reset within 10 ms
2. pause for at least 15 ms
3. parameter Reset value = 1 (Off)
The counters of the inputs DI1…DI8 are reset to zero also after device restart. The counter values of the
inputs DI9…DI12 are stored in a non-volatile memory and are retained after device restart.

Configuration and operation
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4.8.3 High frequency counter
The high frequency 32-bit pulse counter can be selected for the inputs DI1…DI8. The maximum input fre-
quency is 100 kHz with a duty cycle of 0.5. It resets to zero on overflow. To reset the counter forcibly via
Modbus, proceed the same way as for LF counter (Sect. 4.8.2).
4.8.4 Frequency / period measuring
The frequency measuring can be selected for the inputs DI1…DI8. A square wave signal must be applied. A
32-bit register is used.
If Period measuring is selected, the period of the signal with a frequency of 0 to 100 Hz can be measured in
milliseconds.
If Frequency measuring is selected, the frequency of the signal in the range of 100 Hz to 100 kHz can be
measured in Hz.
The frequency or period is calculated by counting the number of pulses on the input during the measurement
interval (Frequency measuring interval parameter in Table 4.6).
4.8.5 Encoder
Up to three AB encoders can be connected to the inputs DI3-4, DI5-6, DI7-8. The maximum frequency of the
encoder signal - 100 kHz.
The counter accumulates the number of the pulses received from the encoder considering the direction of
rotation. If the direction of rotation is changed, the pulses are subtracted and the number of the counted
pulses is decreased. The current number of pulses is stored in a 32-bit memory register.
The counter resets to zero on overflow. To reset the counter forcibly via Modbus, proceed the same way as
for LF counter (Sect. 4.8.2).
4.9 Digital outputs
To configure the digital outputs, open the Digital outputs group in the parameter tree.
Table 4.8. Output parameters
Parameter Description Range
Default
value
Access
Single
Control mode
Output control mode
On-Off / PWM
On-Off
RW
PWM period
Period in PWM mode
1000…60000 ms
1000
RW
PWM duty cycle
Duty cycle in PWM mode
0…1000 ‰
50
RW
Safe state
Output state after communication loss
(Sect. 4.9.1)
0…1000 ‰ 0 RW
Output diagnostic
Output diagnostic option (Sect. 4.9.2)
On / Off
Off
RW
Group
Output bitmask
Output state bitmask
0…255
-
R
New output bitmask
New output state bitmask
0…255
0
RW
Diagnostic bitmask
Output diagnostic bitmask
0…255
-
R
There are two modes of output control:
– On-off
– Pulse-width modulation (PWM)
The PWM control is determined by the parameters PWM period and PWM duty cycle.
Output group parameters are bitmasks. The least significant bit of the mask corresponds to the input DO1.
To change the output state, set the corresponding bit in the bitmask of the parameter New output bitmask.

Configuration and operation
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16
4.9.1 Output safe state
Safe state is the PWM duty cycle in ‰, applied to the PWM output if the network data exchange is interrupt-
ed i.e. there is no request from the master within the time specified in the parameter Safe state timeout
(Modbus Slave group) (Sect. 4.5).
Safe state has no effect in On-off mode.
Safe state is inactive if the parameter Safe state timeout is set to 0.
Safe state can be specified in the parameter Safe state for each output.
In the safe state condition, the following applies:
−The LED lights red until a new master request is received.
−The output remains in the safe state until a command from the master for state change is received.
When the safe state is active and the module is powered on, the outputs are set to the last saved state (be-
fore powering off), until a new value of the PWM duty cycle is received from the master.
When the safe state is inactive and the module is powered on, the outputs are closed until a new value of the
PWM duty cycle is received from the master.
4.9.2 Output diagnostic
Diagnostic of the relay contacts closure and the load connected to the output can be enabled for each output
in the parameter Output diagnostic.
The diagnostic result can be read out in the Diagnostic bitmask parameter. The parameter is a bitmask that
contains the results of the output diagnosis. The least significant bit of the mask corresponds to the input
DO1. If an output is in the error state, the output LED lights up red and the corresponding bit in the bitmask is
set to 1.
For diagnostic purposes, a 200 kΩresistor RDis connected in parallel with the normally open relay contacts
(Fig. 4.2).
– When the relay is off and the current IDflows through the resistor, the output works normally. The
absence of a voltage drop across the resistor indicates an open load or relay welding, the fault status
gets active.
– When the relay is on and there is no current IDthrough the resistor, the output works normally. If the
current flows, the relay or its contacts are damaged, the fault status gets active.
Fig. 4.2. Output diagnostic
When the output diagnostic is disabled, the resistor RDis not electrically disconnected from the output circuit,
and small current flows through the load.
The diagnostic works under the following conditions:
−DC: supply voltage at least 18 V DC with a load resistance of maximum 10 kΩ
−AC: supply voltage at least 90 V AC with a load resistance of maximum 20 kΩ.

Configuration and operation
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17
4.10 NTP protocol
The module supports the synchronization of the RTC with an NTP server v4. Open the NTP group to config-
ure NTP parameters.
Table 4.9. NTP parameters
Parameter Description Range
Default
value
Access
Enable
Enable NTP connection
On / Off
Off
RW
NTP server pool
IP or URL of NTP pool. If the server is located
in an external network, check the correct val-
ues for the parameters Gateway and DNS
(Network group)
- pool.ntp.org RW
NTP server 1
IP or URL of the primary NTP server
-
192.168.1.1
RW
NTP server 2
IP or URL of the secondary NTP server
192.168.1.2
RW
Synchronization
period
Time synchronization period in seconds.
Ensure the set value is not less than the mini-
mum value for the selected NTP server.
5…65535 s 5 RW
Status
Server connection status
-
-
R
All specified NTP servers (including servers from the pool) have the same polling priority.
For more information see document: NTP_MQTT_SNMP_protocols.
4.11 MQTT protocol
4.11.1 Basics
The MQTT protocol defines two types of network entities: a message broker and a number of clients. Broker
is a server that receives all messages from the clients and then routes the messages to the appropriate des-
tination clients. Client can be publisher or / and subscriber.
Published messages are organized in a hierarchy of topics. When a publisher has a new data to distribute, it
sends a message with the data under the particular topic to the connected broker. The broker distributes the
message to any clients that have subscribed to that topic.
A topic is a UTF-8 encoded character string that the broker uses to filter messages for each connected cli-
ent. The topic consists of one or more topic levels. Each topic level is separated by a forward slash (topic
level separator).
When a client subscribes to a topic, it can subscribe to the exact topic of a published message or it can use
wildcards to subscribe to multiple topics simultaneously. There are two kinds of wildcard symbols: single-
level (+) and multi-level (#) (see Example 1).
4.11.2 Implementation
The module supports the MQTT protocol (v3.1.1) and can be used as client. It can publish information about
the status of its inputs and outputs and can be subscribed to topics which control its outputs.
To configure the MQTT parameters, open the MQTT group in the parameter tree.
NOTE
When using the MQTT protocol, it is recommended to set the parameter "Safe state
timeout" (“Modbus Slave” group) to 0, since writing is usually event-driven and not cyclic
in this case.

Configuration and operation
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18
Table 4.10. MQTT parameters
Parameter Description Range
Default
value
Ac-
cess
Presence detection.
Enable
If
On
, the module publishes the message "Online"
to the topic specified in the parameter Topic
name after switching on. If no messages are re-
ceived from the module, the broker publishes an
“Offline” message in this topic.
On / Off Off RW
Presence detection.
Topic name
Topic name used for presence detection. - MQTT-
status
RW
Connect to broker
Set to On to establish connection
On / Off
Off
RW
User name
Used for device authentication on the broker side.
Authentication is not used if the values are not
specified.
-
-
RW
Password - - RW
Device name
Device name used in the topic name (see Exam-
ple 1)
- - RW
Broker address
Broker IP or URL. If the broker is located in an
external network, check the correct values for the
parameters Gateway and DNS (Network group)
- - RW
Port
Port for broker
0…65535
1883
RW
Store last message
If
On
, other clients subscribed to the module's
topics will receive the latest messages from these
topics.
On / Off Off RW
Publishing interval
Publishing interval in seconds
5…600
10
RW
Quality of service
QoS0
- at most once
QoS1 - at least once
QoS2 - exactly once
QoS0 /
QoS1 /
QoS2
QoS0 RW
Keep Alive interval
Keep Alive interval in seconds
0…600
0
RW
Status
Broker connection status
-
-
R
Table 4.11. Topics
Parameter Topic Node Function Format
Input bitmask
MASK
DI
GET
UINT
Pulse counter value
COUNTER
DI1…DI12
GET
UINT
New output bitmask
MASK
DO
SET
UINT
Output bitmask
STATE
DO
GET
UINT
Diagnostic bitmask
DIAGNOSTICS
DO
GET
UINT
Example 1:
Device – device name specified in akYtecToolPro
1. Read the bitmask of digital inputs
MX210/Device/GET/DI/MASK
Obtained value: 15 (HIGH on inputs 1-4)
2. Write the bitmask of digital outputs
MX210/Device/SET/DO/MASK
Recorded value: 15 (outputs 1-4 are on)
3. Single-level wildcard usage
MX210/Device/GET/+/COUNTER
Obtained value: counter values of all digital inputs. The topic is equivalent to the group of topics:
MX210/Device/GET/DI1/COUNTER
MX210/Device/GET/DI2/COUNTER
MX210/Device/GET/…/COUNTER
MX210/Device/GET/DIn/COUNTER

Configuration and operation
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4. Multi-level wildcard usage
MX210/Device/GET/#
Obtained value: all module parameters available for reading. The topic is equivalent to the group of top-
ics:
MX210/Device/GET/DI/MASK
MX210/Device/GET/DI1/COUNTER
MX210/Device/GET/DI2/COUNTER
MX210/Device/GET/…/COUNTER
MX210/Device/GET/DIn/COUNTER
For more information see document: NTP_MQTT_SNMP_protocols.
4.12 SNMP protocol
4.12.1 Basics
The protocol is based on the Client / Server architecture, where clients are called managers and servers are
called agents.
Managers can read (GET) and write (SET) agent parameters. Agents can send messages (traps) to manag-
ers about changes in any parameter.
Each agent parameter has a unique identifier (OID - object identifier), which is a sequence of numbers sepa-
rated by periods.
4.12.2 Implementation
The module supports SNMP protocol (SNMPv1 and SNMPv2c versions) and can be used as agent with GET
and SET requests.
All module parameters are available via SNMP protocol. The list of parameters is given in App. D.
NOTE
When using the SNMP protocol without GET requests, it is recommended to set the pa-
rameter "Safe state timeout" (“Modbus Slave” group) to 0, since writing is usually event-
driven and not cyclic in this case.
Table 4.12. SNMP parameters
Parameter Description Range
Default
value
Access
Enable
Enable SNMP connection
On / Off
Off
RW
Read community
Password for read access
-
public
RW
Write community
Password for write access
-
private
RW
Trap IP address
IP address to which the trap will be sent in case
of changing the mask of the digital inputs (mod-
ules with digital inputs only)
- 10.2.4.78 RW
Trap port
Port number to which the trap will be sent
0…65535
162
RW
SNMP version Protocol version
SNMPv1 /
SNMPv2
SNMPv1 RW
For more information see document: NTP_MQTT_SNMP_protocols.