Lumel SM2 User manual

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4-CHANNEL MODULE
OF ANALOG INPUTS
SM2 TYPE
USER’S MANUAL

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CONTENTS
1. APPLICATION..............................................................................................5
2. MODULE SET ..............................................................................................6
3. BASIC REQUIREMENTS AND OPERATIONAL SAFETY..........................6
4. INSTALLATION............................................................................................9
4.1. Way of fixing ..........................................................................................9
4.2. Diagrams of external connections .........................................................9
5. HANDLING.................................................................................................12
5.1. Description of the MODBUS protocol implementation ........................12
5.2. Description of the MODBUS protocol function ....................................13
5.3. Map of registers...................................................................................16
5.4. Registers only for readout ...................................................................17
5.5. Registers for write and readout ...........................................................21
6. TECHNICAL DATA.....................................................................................33
7. BEFORE A DAMAGE WILL BE DECLARED............................................35
8. EXAMPLES OF THE SM2 MODULE PROGRAMMING............................36
9. ORDERING CODES...................................................................................40
10. MAINTENANCE AND WARRANTY...........................................................41

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1. APPLICATION
the SM2 4-channel module of analog inputs is destined to convert standard sig-
nals, resistance or temperature signals into numerical data accessible through the
RS-485 or RS-232 port by means of the MODBUS protocol.
The measurement is carried out independently on four, galvanically insulated
between them channels. RS-485 and RS-232 output ports are galvanically insulated
from input signals and the supply. The module programming is possible by means of
the RS-485 or RS-232 port. In the set of SM2 module there is a connecting cable,
to connect with the PC computer (RS-232).
The SM2 module realises following functions:
 mathematical operations on channels and between measuring channels,
 conversion of measured or calculated quantities basing on the individual linear
characteristic,
 storage of maximal and minimal values for each channel,
 programming of the measurement averaging time, independently for each
channel,
 handling of RS-485 and RS-232 interfaces in MODBUS protocol, both in ASCII
and RTU mode,
 change of the OC type output state basing on set alarm values.
Fig. 1. View of the SM2 module

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2. SET OF THE SM2 MODULE
The set consists of:
- SM2 module ............................................................................1 pc.
- user’s manual..........................................................................1 pc.
- warranty card...........................................................................1 pc.
- plug with screw terminals ........................................................4 pcs
- hole plug of the RS-485 and RS-232 sockets .........................2 pc
- RS-232 cable to connect to the computer (1.5 m.)..................1 pc
When unpacking the module, please check whether the type and execution
code on the data plate correspond to the order.
3. BASIC REQUIREMENTS, SAFETY INFORMATION
Symbols located in this service manual mean:
WARNING!
Warning of potential, hazardous situations. Especially important.
One must acquaint with this before connecting the module.
The non-observance of notices marked by these symbols can occa-
sion severe injuries of the personnel and the damage of the module.
CAUTION!
Designates a general useful note. If you observe it, handling of the
module is made easier. One must take note of this, when the module
is working inconsistently to the expectations. Possible consequences
if disregarded!
In the security scope the module meets the requirements of the EN 61010-1
standard.
Remarks concerning the operator safety:
1. General
 The SM2 module is destined to be installed in measuring systems.
 Non-authorized removal of the required housing, inappropriate use, incorrect
installation or operation create the risk of injury to personnel or damage to
equipment. For more detailed information please study the user’s manual.

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 All operations concerning transport, installation, and commissioning as well as
maintenance must be carried out by qualified, skilled personnel and national
regulations for the prevention of accidents must be observed.
 According to this basic safety information, qualified, skilled personnel are
persons who are familiar with the installation, assembly, commissioning, and
operation of the product and who have qualifications necessary for their
occupation.
2. Transport, storage
Please observe the notes on transport, storage and appropriate handling.
Observe the climatic conditions given in Technical Data.
3. Installation
 The module must be installed according to the regulation and
instructions given in this user’s manual.
 Ensure proper handling and avoid mechanical stress.
 Do not bend any components and do not change any insulation distances.
 Do not touch any electronic components and contacts.
 Modules may contain electrostatically sensitive components, which can easily
be damaged by inappropriate handling.
 Do not damage or destroy any electrical components since this might
endanger your health!
4. Electrical connection
 Before switching the module on, one must check the correctness of
connection to the network.
 In case of the protection terminal connection with a separate lead one must
remember to connect it before the connection of the module to the mains.
 When working on live modules, the applicable national regulations for the
prevention of accidents must be observed.
 The electrical installation must be carried out according to the appropriate
regulations (cable cross-sections, fuses, PE connection). Additional
information can be obtained from the user’s manual.
 Apply a two-wire cable for the connection to the network acc. to the
EN 61010-1 standard.
 Do not connect the module to the network through an autotransformer.
 In the building installation, a cut-out or a circuit-breaker should exist, situated
near the device and easy accessible to the operator. It should be marked as
the element switching the device out.

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 The documentation contains information about installation in compliance with
EMC (shielding, grounding, filters and cables). These notes must be observed
for all CE-marked products.
 The manufacturer of the measuring system or installed devices is responsible
for the compliance with the required limit values demanded by the EMC
legislation.
5. Operation
 Measuring systems including SM1 modules must be equipped with protection
devices according to the corresponding standard and regulations for
prevention of accidents.
 After the instrument has been disconnected from the supply voltage, live
components and power connections must not be touched immediately
because capacitors can be charged.
 The housing must be closed during operation.
 The RS-232 socket serves only to connect the device (Fig.5) working with the
MODBUS protocol. When the module is not used place the hole plug in the
RS-232 socket of the module.
6. Maintenance and servicing.
Please observe the manufacturer’s documentation.
Read all product-specific safety and application notes in this user’s manual.
 Before taking the module out, one must turn the supply off.
 The removal of the module housing during the warranty contract period may
cause its cancellation.
4. INSTALLATION
4.1 Way of fixing
The SM2 module is fixed on a 35 mm rail in accordance with EN 60715. The module
housing is made of a self-extinguishing plastic. Overall dimensions of the housing:
45 120 100 mm. One must connect to the module, external wires with cross-
section up to 2.5 mm2
Overall dimensions and the fixing way are presented on the fig. 2.

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Fig.2. Overall dimensions and way of fixing the module
4.2. External connection diagrams
Make the connection of input signals, supply
and interface acc. to the fig. 3, 4 and 5
Fig. 3
Connection way of external signals. The
connection diagram is also placed on the
module housing

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Fig. 4 connection way of input signals
Taking in consideration electromagnetic interference one must use shielded wires
to connect input signals and output signals. The supply must be connected by a
two-wire cable, with the appropriate wire diameter ensuring its protection by means
of a safety fuse.
Measured signal
Connection way
4 voltage inputs 4 current inputs
4 x 0...10 V 4 x 0/4... 20 mA
Measured signal
Connection way
2 voltage inputs + 2 current inputs
4 resistance thermometer inputs
in 2-wire system or resistance
measurement
2 x 0...10 V 2 x 0/4... 20 mA
The polarization is optional when supplying by d.c. voltage.