EL.CO. S.R.L. – ELK22MP
-
INSTRUCTIONS FOR USE
- Ver.05 - 03/22 - PAG. 4
3.4 – PROGRAMMING VIA ETHERNET TCP / IP (only for
ELK22MPE models)
3.4.1 – DESCRIPTION
ELK22MPE devices are equipped with an RJ45 Modbus TCP / IP
communication interface. At rest, the module is in receiving
condition and transmits after receiving and decoding a correct
message addressed to it.
The poll rate during programming and in use must not be
less than 50ms.
In case of using a number greater than 8 ELK22MPS the
recommended poll speed is greater than or equal to 80ms.
3.4.2 – COMMUNICATION PROTOCOL DESCRIPTION
The protocol is a subset of the widely used MODBUS RTU protocol.
This choice guarantees ease of connection to many PLCs and to all
commercial supervision programs.
The connection between the ELK22MPE centralizer with the
ELK22MPS slaves is via bus, which can be purchased as an
accessory. (see Paragraph 10.6)
The default IP address is 10.10.10.50.
The default SUBNET MASK address is 255.255.255.0
The default GATEWAY address is 0.0.0.0
For those wishing to develop their own application software, all the
necessary tips and information are available.
The MODBUS TCP / IP protocol functions implemented in the
EKL22MPE instruments are:
Function 1 - output status read
Function 3 - n word read
Function 6 - one word write
Function 7 - allarm status read
These functions (see Paragraph 8) allow the supervision program to
read and modify any data of the module. The communication is
based on messages sent from the centralization station
(ELK22MPE) to a slave station (ELK22MPS) and vice versa. The
slave station which recognizes its address in the message,
analyzes its content and, if it finds it formally and semantically
correct, generates a reply message for the master.
The communication process involves four types of messages:
From the centralizer to the slave:
•
Function 1: output status read request
•
Function 3: n word read request
•
Function 6: one word write request
•
Function 7: allarm status read request
From the slave to the centralizer:
•
Function 1: output status read replay
•
Function 3: n word read replay
•
Function 6: one word write replay
•
Funzione 7: allarm status read replay
Each message contains six fields:
•
header: 2 bytes of unique identification code
•
control: 2 bytes always at 0
•
length: length of the packet excluding the first 6 bytes
•
slave address: the values between 1 and 255 are valid;
address 0 (zero) is reserved by MODBUS RTU for the
diffusion of messages, but is not adopted in the ELK22MP
series due to the implicit unreliability of this type of
communication;
•
function code: contains 1 or 3 or 6 or 7 depending on the
specified function;
•
information field: contains the addresses or the value of
the words, as required by the function in use;
The functions described for the TCP / IP protocol are found in
Paragraph 8.
3.4.3 – DATA EXCHANGE
The data exchanged consists of a 16-bit word. All readable and
writable data appear as 16-bit words allocated in the instrument's
memory.
The operating and configuration parameters of the instrument can
be read and written via serial communication.
The configurable parameters are found in Paragraph 6.
4 – WARNINGS FOR INSTALLATION AND USE
4.1 – PERMITTED USE
The device has been designed as a measurement and
adjustment device in accordance with EN61010-1 for
operation at altitudes up to 2000 m. The use of the
device in applications not expressly provided for in the
aforementioned standard must include all appropriate protective
measures. The device CANNOT be used in hazardous
(inflammable or explosive) environments without proper protection.
It should be remembered that the installer must ensure that the
electromagnetic compatibility rules are respected even after the
device has been installed, possibly using special filters. If a failure
or malfunction of the device can create hazardous or dangerous
situations for persons, animals or property, the system must be
equipped with additional electromechanical devices to ensure
safety.
4.2 - MECHANICAL ASSEMBLY
The ELK22Mp module must be installed on the DIM rail. Avoid
placing the inside of the device in places subject to high humidity or
dirt that may cause condensation or introduction into the device of
parts or conductive substances. Ensure that the device has
adequate ventilation and avoid installation in containers where
devices are located that can lead the device to operate outside the
declared temperature limits. Install the device as far as possible
from sources that may generate electromagnetic disturbances such
as motors, contactors, relays, solenoid valves etc.
Only the frontal panel will be accessible after the installation.
The programming device, in a 50 x 50 mm container, is designed
for panel-mounted mounting inside housing. Then make a 45 x 45
mm square hole or a 22 mm diameter hole and insert the keypad by
fastening it with the supplied nut. It is recommended to mount the
special gasket to obtain the degree of frontal protection stated.
An installation not complying with these instructions could
compromise the protection declared.
4.3
ELECTRICAL CONNECTIONS
Make the connections by connecting only one conductor for each
clamp and following the diagram shown, checking that the supply
voltage is that indicated on the device and the absorption of the
actuators connected to the device is not higher than the maximum
current allowed. The device, provided for permanent connection
within an equipment, does not have either switch or internal
overcurrent protection devices. It is therefore recommended to
provide for the installation of an overcurrent protection device
(500mA fuse for the 230
∿
model or 2A fuse for the 24
≂
model) and
a bipolar switch/disconnecting switch, marked as a disconnecting
device, which interrupts the power supply of the device. This switch
must be positioned as close as possible to the device and in a place
easily accessible by the user. It is also recommended to adequately
protect the supply of all circuits connected to the device with
suitable items (i.e. fuses) that are appropriate for circulating
currents. It is recommended to use insulation cables suitable to the
voltages, temperatures and operating conditions and to ensure that
