Romutec romod-eco Series User manual

Technical Documentation / Instruction Manual
Remote controlled I-/O-Devices
containing digital and analog inputs and outputs
for use in building automation and control systems
with
Modbus RTU interface
for DIN rail mounting
romutec®
Steuer- u. Regelsysteme GmbH
Jochsberger Straße 39
D-91592 Buch am Wald
Phone: [phone]
Fax: [phone]
E-Mail: [e-mail]

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Contents
1 Features and advantages of romod-eco.......................................................................................................3
2 General information......................................................................................................................................4
2.1 Notes on the operating manual..............................................................................................................4
2.2 Safety information..................................................................................................................................4
3 System description .......................................................................................................................................5
4 Configuration ................................................................................................................................................6
4.1 Hardware................................................................................................................................................6
4.2 Bus connection to MODBus master devices .........................................................................................7
4.2.1 Communication within MODBus master-slave systems..................................................................7
4.2.2 Terminal assignment of the MODBus RTU (RS485) port...............................................................7
4.2.3 Recommended cable types for bus wiring ......................................................................................7
4.2.4 MODBus commands supported ......................................................................................................7
4.3 Configuration registers...........................................................................................................................8
5 Description of available modules for MODBus connection ..........................................................................9
5.1 Digital input module 16 DI eco...............................................................................................................9
5.2 Digital output module with MOSFET outputs 8 DO eco.......................................................................11
5.3 Digital output module with relay outputs 8 DO-R eco..........................................................................13
5.4 Digital input/output module with relay outputs 4 DIO-R eco................................................................15
5.5 Digital output module with relay outputs 4 DO-R eco..........................................................................17
5.6 Analog input module 8 AI eco..............................................................................................................19
5.7 Analog output module 8 AO eco..........................................................................................................21
Appendix........................................................................................................................................................23
A) Technical specifications............................................................................................................................23
B) Dimensions and weights...........................................................................................................................24
C) Wiring diagrams........................................................................................................................................25
Fig. C-1 : romod 16 DI eco.........................................................................................................................25
Fig. C-2 : romod 8 DO eco.........................................................................................................................26
Fig. C-3 : romod 8 DO-R eco.....................................................................................................................27
Fig. C-4 : romod 4 DIO-R eco....................................................................................................................28
Fig. C-5 : romod 4 DO-R eco.....................................................................................................................29
Fig. C-6 : romod 8 AI eco...........................................................................................................................30
Fig. C-7 : romod 8 AO eco.........................................................................................................................31
D) Types and Registers overview:.................................................................................................................32
D1 - Overview of Registers 16DI eco Module............................................................................................33
D2 - Overview of Registers 8DO eco and 8DO-R eco Module..................................................................35
D3 - Overview of Registers 4DIO-R eco Module.......................................................................................36
D4 - Overview of Registers 4DO-R eco Module........................................................................................41
D5 - Overview of Registers 8AI eco Module..............................................................................................43
D6 - Overview of Registers 8AO eco Module............................................................................................45
D7 - Overview of Registers which all modules have in common...............................................................46

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DIN rail mounted
Remote controlled I-/O-Devices
containing digital and analog inputs and outputs
with
Modbus RTU interface
1 Features and advantages of romod-eco
romod-eco, the DIN-rail mounted remote controlled I-/O-modules from romutec, provide the
following features:
Connection between modules and DDC acc. to MODBus specifications
Easy wiring of the DIN-rail mounted devices
Optimization of the size of the cabinet because of small footprint on the mounting plate
Easily expandable due to modular design
No high investment costs for programming interfaces, no gateways necessary
Automatic baud rate detection (autobaud)
Applications: systems of building automation, e.g. heating, ventilation, air conditioning and
refrigeration systems, as well as in equipment for operational control
Direct connection to the MODBus RTU interface as slave devices
Connection via RS485 (EIA485)
The romod-eco modules operate as slaves to all PLC or DDC systems that can provide MODBus
RTU master functionality. Programming is done via the corresponding programming environment
of the master system.
Copyright
Copyright 19 romutec® Steuer- u. Regelsysteme GmbH. All rights reserved. Without the express written permission, this manual
may not be reproduced, transmitted, transcribed, stored in a data recording system, or translated into any language or computer
language, neither in whole or in part. This applies to any form and any means, whether electronic, mechanical, magnetic, optical,
manual, or any other way.
Modbus® is a registered trademark of Schneider Electric, licensed to the Modbus Organization, Inc.
Errors and changes excepted

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2 General information
2.1 Notes on the operating manual
To take full advantage of your new remote controlled I-/O-devices, you should read all the chapters of this
manual to get information about the features of the equipment and to learn how to safely use the system.
2.2 Safety information
Before you put your devices into operation, you should read the following carefully. This also applies if any
questions should arise at a later time.
Intended use:
The devices are to be used exclusively for the terms and features specified in this documentation. With
improper use, the manufacturer assumes no product liability and warranty claims.
Follow all warnings and notes marked on the device or listed in the technical documentation.
Operate the devices only when properly mounted on a DIN-rail or in a appropriate mounting frame
The modules should not be installed in the immediate vicinity of frequency converters.
Frequency converters must be provided with all safety measures in order to comply with the
required regulations and guidelines (e.g. line filter, etc.)
Do not use the product near water or other liquids which can damage the electronic components.
The supply voltage must correspond to the information in the technical data.
The terminals of the device should only be wired by authorized and trained personnel.
Do not perform wiring work whenever the device is powered. There is a risk of electrical shock.
Connecting and disconnecting the terminals or connectors under voltage should be avoided. The
devices might be destroyed.
Make sure that no objects, e.g. screws or other fastening material, gets into the device.
Avoid installation in areas with extreme temperature fluctuations. The temperature ranges for
storage and operation which are given in the datasheet must be maintained to ensure trouble-free
operation.
However, should problems occur, do not try to repair the device yourself. Do not open or disassemble the
device. Doing so, parts inside the device might be damaged on contact. Basically, if you have any
problems please contact the manufacturer.

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3 System description
The romod-eco module family is a set of romutec® remote controlled Input-/Output-devices (remote I/Os)
for mounting on DIN rails. It consists of various types of I/O modules. The connection to the MODBus
master device is done via a RS485 connection. The communication takes place via MODBus RTU.
Each module has its own RS485 bus interface, therefore no gateway module is required. The address is
set by means of an 8-pole dip switch. The available range of addresses is 0 ... 254.
The remote I/O devices operate as slave modules with any MODBus master.
The system can be used at all RS485 ports. The baud rate of the protocol will be automatically detected
when receiving several telegrams.
As expansion modules the following types are available:
Digital input modules 16 DI eco, activation of the inputs conventionally wired via terminal and
passing over the bus to the MODBus master device for further processing.
Digital output modules 8 DO eco with ground referenced semiconductor outputs +24 V DC,
activation of outputs by commands via MODBus.
Digital output modules 8 DO-R eco with potential-free relay outputs (two groups with four relays
each), activation of outputs by commands via MODBus.
Digital input/output modules 4 DIO-R eco with four digital inputs and four potential-free relay
outputs (normally open contacts), activation of outputs by commands via MODBus.
Digital output modules 4 DO-R eco containing four bistable relay outputs (normally open contacts),
activation of outputs by commands via MODBus.
Analog input modules 8 AI eco, input signals conventionally wired via terminals and passing over
the bus to the MODBus master for further processing. Configurable sensor inputs (0 .. 10 V and
various RTD).
Analog output modules 8 AO eco, setting the output values by commands via MODBus.

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4 Configuration
4.1 Hardware
Maximum number of expansion modules per MODBus interface
Basically, as many romod devices can be connected to a bus interface as addresses can be set. The
complete address range of 0 ... 254 is available. However, please adhere to the DDC’s manufacturer's
recommendations concerning the maximum number of slave devices which may be connected to the bus
interface of the master device, as well as any constraints given for the address range.
Installation and wiring
Installation and wiring of the modules which are containing the hardware IOs will be done in the cabinet on
the mounting plate.
Addressing
The address which is used for communication with the
module has to be set by means of a dip switch in the range
of 0 ... 254. Dip #1 (most left) represents the value 1, Dip #8
(most right) signifies the value 128.
The following should be considered when setting the
addresses:
There are not allowed any duplicate addresses. Each
address can be assigned only once per MODBus line.
The addresses can be selected arbitrarily in the range of
0 ... 254, setting sequential addresses is not necessary.
Note: When setting the address 255, the device
performs a reset followed by a lamp test. Doing so, all
parameters stored in the EEPROM will be reset to
factory settings. Important: This also happens during
operation, without de-energizing the module in the
meantime!
Using the EOL switch (two pin dip switch), the bus can be terminated (active termination, 560R /
120R / 560R).
Meaning of the status LED (valid for all modules)
The status LED is located to the right of the dip switch used for setting the address of the module.
It signals the following states:
Green
accelerated
blinking
Start-up sequence running
Steady light
operational
Orange
flashing
Communicating with the master (valid
telegram received)
Red
flashing
Faulty or unvalid telegram received

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4.2 Bus connection to MODBus master devices
4.2.1 Communication within MODBus master-slave systems
For communication between a controller (DDC or PLC) and the romutec® Remote I/O devices, it is
necessary to configure an RS485 interface of the controller as MODBus master with the serial port
parameter settings 8, N, 1. This is done with the programming software of the manufacturer of the
controller.
For questions, please consult the manual or contact the manufacturer of the controller.
4.2.2 Terminal assignment of the MODBus RTU (RS485) port
The terminal assignment for the bus connection of the romod series to MODBus RTU master devices is for
all module types as follows:
Type of Interface
Function
Terminal No.
MODBus
Master
RS485
Rx-Tx (Net_B +)
/Rx-/Tx (Net_A -)
I-GND
5
4
3
+ (B)
- (A)
Bus-GND
The bus interface is electrically isolated. The I-GND terminals must always be wired, whether with braided
shield or individual strands, and connected to ground / earth potential. There is no internal connection
between I-GND and the GND of the power supply.
Terminating the RS 485 interface (acc. EIA-485) is required. Therefore, the termination has to be
enabled by means of the two-pole dip switch on the last device which is connected to the bus. The
termination will be realized within the device in active mode.
Additionally, in every module a bias resistor of 47 k is present, which is enabled always.
4.2.3 Recommended cable types for bus wiring
For a total length up to 100m: more than 100m:
Cable type: LIYCY 1x2x0,5mm² shielded CYPIMF 1x2x0,5mm² shielded
Line resistance: < 4,0Ω / 100m < 4,0Ω / 100m
Capacitance: < 13.0nF / 100m < 6.0nF / 100m
4.2.4 MODBus commands supported
The following commands will be supported:
Function Code
Command
Specifics and limitations
03
Read Holding
Registers
Reading a contiguous block of registers is possible
only for certain registers; other registers must be
read individually (number of registers = 1).
06
Write Single
Register
16
Write Multiple
Registers
Writing a contiguous block of registers is possible
only for certain registers; other registers must be
written individually (number of registers = 1).

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4.3 Configuration registers
Selection: Inverting of the digital inputs
The logical status of the digital inputs can be inverted by using the register 'Inverting Digital Inputs'.
Selection: ‚Safe State’ of the digital and analog outputs
All digital and analog outputs can be configured so that they will assume a defined state (‘safe state’) if the
module has not received valid bus telegrams via the MODBus for a certain time. These predefined states
are set separately for each output, whereas the time until activating the safe state is common for all outputs
of a module.
Note: The time for triggering the 'safe state' should not be too short in order to avoid malfunctions
as they can occur, e.g., when another device which is connected to the bus fails and will so cause
time-outs.
Selection of the sensor types for analog inputs
The analog inputs can work with different types of sensors (active and passive ones). The sensor type is
defined for each analog input using a configuration register ('Types of sensors connected to the analog
inputs'). This has an effect on the displayed analog values, as the sensor characteristics are implemented
in the module.
Selection: Automatic baud rate detection or manually setting the baud rate
It can be selected whether the automatic baud rate detection shall be active permanently or only in the first
5 minutes after a cold start. Furthermore, autobauding can also be completely deactivated. In this case, the
device will work with a fixed baud rate which has to be set in another register.
Note: For optimal bus communication it is recommended to set the baud rate to a fixed value and to
disable the automatic baud rate detection while configuring and commissioning the modules.
Setting the value for 'bus timeout'
The safe state function of the outputs will be activated if no valid bus telegram is received for a certain time.
This time is defined by the value which is set in the register ‘bus timeout’.
Register used for sending a command to the module
By means of this register, functions like the reset of all configuration registers can be triggered by sending a
command to the device.

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5 Description of available modules for MODBus connection
5.1 Digital input module 16 DI eco
The digital input module romod 16 DI eco is used
for connecting of up to 16 digital messages.
These include operating messages, error
messages such as frost, filter dirty or fan belt
damaged, and status messages such as damper
positions.
The control of the inputs will be done with 24 V
switched by external dry contacts that are
connected to the module via terminals.
The reference potential is defined via the COM
terminals and can be both, 0 volts and 24 volts.
When using a reference potential of +24 volts, a
control of the digital inputs with 0 V potential can
be realized. The two COM terminals are
connected internally, but not with the GND of the
power supply, i.e. that reference potential for the
inputs has to be connected anyway.
Using the settings in MODBus registers, you can
select open circuit or closed-circuit principle for
each input separately.
The digital inputs can be used as counters, but
only for DC signals. For each input, a prescaler
may be adjusted in order to count, e.g., just every second or third pulse. A subsequent change of the
prescaler also results in a (retroactive) amendment of the corresponding counter values. The pulse
duration must be at least 10 ms to be reliably detected.
For AC control of the inputs, the edge detection has to be delayed via configuration registers (see registers
R1101 and R1111). In case of 50 Hz, this value should be set to at least 40 ms in order to avoid the
counting of false detections. The maximum counter value when using a prescaler of 1 is 65,535 (which is
equivalent to 216-1).
There is a register that displays whether and which DI has changed since the last time this register has
been read. When reading this register, all bits are reset to zero automatically. If a DI's status has altered
several times, e.g. from 0 to 1 and back to 0, a change will be signalized, anyway.
Regarding the system configuration (addressing, maximum number of modules connected to a MODBus
Master interface, installation, connection to the bus etc.), please follow the instructions in the chapter
Configuration.
Important technical data:
Power supply: 24 V AC or DC, connection via terminals
Current consumption: max. 150 mA (DC), 220 mA (AC), all DIs loaded

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Overview terminal assignment:
romod 16 DI eco
For activation of digital inputs
use 24V AC/DC
GND
24V AC/DC
COM for DIs
DI No. 1-8
1
2
3
4
5
6
7
8
Terminal:
11
12
13
14
15
16
17
18
DI No. 9-16
9
10
11
12
13
14
15
16
Terminal:
19
20
21
22
23
24
25
26
COM für DIs
Terminal:
10
27
Power supply
Terminal:
1
2
Sink and source operation mode is possible with the inputs. The two COM terminals of the DIs are bridged
internally.
Bus connection
Terminal No.
I-GND
3
Net A (–) aka /D
4
Net B (+) aka D
5

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5.2 Digital output module with MOSFET outputs 8 DO eco
The digital output module romod 8 DO eco is a
Remote I/O Device which is used to control eight
1-stage motors, or other digital actuators.
The digital MOSFET outputs are provided by the
module via terminals. They are ground
referenced, + 24VDC.
The source voltage for the DOs is also
connected via terminals and must be +24 volts
(DC). The two supply terminals are connected
with each other internally, but not with the
24 V power supply, i.e. there must be applied
a source voltage for the outputs in any case.
All digital outputs can be configured so that they
will assume a defined state (‘safe state’) if the
module has not received valid bus telegrams via
the MODBus for a certain time. These predefined
states are set separately for each output,
whereas the time until activating the safe state is
common for all outputs of a module.
Note: The time for triggering the 'safe state'
should not be too short in order to avoid
malfunctions as they can occur, e.g., when
another device which is connected to the bus
fails and will so cause time-outs.
Regarding the system configuration (addressing, maximum number of modules connected to a MODBus
Master interface, installation, connection to the bus etc.), please follow the instructions in the chapter
Configuration.
Important technical data:
Power supply: +24 V AC or DC, connection via terminals
Current consumption: typically 21 mA (DC), 60 mA (AC), outputs WITHOUT any load
Specifications digital outputs: MOSFET, ground referenced (source operation mode +24 VDC)
Output current 5 ... 500 mA (leakage current max. 0.1 mA)
The load resistance shall not be less than 48 Ω.
Voltage drop max. 0.4 V at 0.5 A
Inductive loads should be avoided as far as possible, or be suppressed at the source,
respectively.

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Overview terminal assignment:
romod 8 DO eco
DOs with ground referenced
semiconductor outputs +24 V DC!
GND
24V AC/DC
+24V DC for DOs
DO No. 1-8
1
2
3
4
5
6
7
8
Terminal:
11
12
13
14
15
16
17
18
+24VDC for DOs
Terminal:
10
19
Power supply
Terminal:
1
2
The two supply terminals (10 + 19) for the DOs are connected with each other internally.
Bus connection
Terminal No.
I-GND
3
Net A (–) aka /D
4
Net B (+) aka D
5

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5.3 Digital output module with relay outputs 8 DO-R eco
The digital output module romod 8 DO-R eco is a
Remote I/O Device which is used to control eight
1-stage motors, or other digital actuators.
The relay outputs provide the normally open
contact of each relay. They will be contacted via
terminals.
The signal that will be switched by the relay
contacts also has to be connected via terminals.
The eight relay outputs are divided into two
groups of four outputs. The two groups are not
linked internally, so both COM-terminals must be
wired.
Important: The signals to be switched must
have the same phasing.
All digital outputs can be configured so that they
will assume a defined state (‘safe state’) if the
module has not received valid bus telegrams via
the MODBus for a certain time. These predefined
states are set separately for each output, whereas
the time until activating the safe state is common
for all outputs of a module.
Note: The time for triggering the 'safe state'
should not be too short in order to avoid
malfunctions as they can occur, e.g., when another device which is connected to the bus fails and
will so cause time-outs.
Regarding the system configuration (addressing, maximum number of modules connected to a MODBus
Master interface, installation, connection to the bus etc.), please follow the instructions in the chapter
Configuration.
Important technical data:
Power supply: 24 V AC or DC, connection via terminals
Current consumption: typically 85 mA (DC), 220 mA (AC) with all relay outputs activated
Specifications digital outputs: Relay outputs (NO contact), max. 250 VAC)
Characteristics (Resistive Load):
Initial contact resistance 100mΩ(at 1A / 24 VDC)
Rated load 3 A at 250 VAC / 30 VDC
Max. switching voltage 277 VAC, 30 VDC
Max. switching capacity 830 VA (AC), 90 W (DC)
Endurance 1x105ops (Rated Load)
Inductive loads should be avoided as far as possible, or be suppressed at the source,
respectively.

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Overview terminal assignment:
romod 8 DO-R eco
Output voltages of DOs are potential-free (two groups)
GND
24V AC/DC
COM DO 1…4
COM DO 5…8
DO No. 1-8
1
2
3
4
5
6
7
8
Terminal:
11
12
13
14
15
16
17
18
COM for DOs
Terminal:
10
19
Power supply
Terminal:
1
2
The two COM supply terminals (10 + 19) for the DOs are NOT connected with each other internally.
Important: The signals to be switched must have the same phasing.
Bus connection
Terminal No.
I-GND
3
Net A (–) aka /D
4
Net B (+) aka D
5
COM DO 5…8
COM DO 1…4

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5.4 Digital input/output module with relay outputs 4 DIO-R eco
The module romod 4 DIO-R eco provides four
digital inputs and four digital outputs. It is used to
control four 1-stage motors, or other digital
actuators, and for signaling of up to four digital
messages. These include operating messages,
error messages such as frost, filter dirty or fan
belt damaged, and status messages.
Digital outputs:
The DOs of the romod 4 DIO-R eco are
controlled via MODBus commands.
The relay outputs provide the normally open
contact of each relay. They will be contacted via
terminals.
Important: The signals to be switched must
have the same phasing.
By means of configuration registers there can be
defined that the digital outputs will also follow the
signals of the digital inputs (in addition to the
control via MODBus). Both, static control and
toggling are possible. Moreover, on and off
delays can be set for each output, as well as
minimum times for the states ON and OFF.
Mutual interlocking of outputs is also possible.
All digital outputs can be configured so that they will assume a defined state (‘safe state’) if the module has
not received valid bus telegrams via the MODBus for a certain time. These predefined states are set
separately for each output, whereas the time until activating the safe state is common for all outputs of a
module.
Note: The time for triggering the 'safe state' should not be too short in order to avoid malfunctions
as they can occur, e.g., when another device which is connected to the bus fails and will so cause
time-outs.
Digital inputs:
The control of the digital inputs will be done with 24 V switched by external dry contacts that are connected
to the module via terminals.
The reference potential is defined via the COM terminals and can be both, 0 volts and 24 volts, i.e. that
reference potential for the inputs has to be connected anyway. When using a reference potential of +24
volts, a control of the digital inputs with 0 V potential can be realized.
Using the settings in MODBus registers, you can select open circuit or closed-circuit principle for each input
separately.

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The digital inputs can be used as counters, but only for DC signals. For each input, a prescaler may be
adjusted in order to count, e.g., just every second or third pulse. A subsequent change of the prescaler also
results in a (retroactive) amendment of the corresponding counter values. The pulse duration must be at
least 10 ms to be reliably detected.
For AC control of the inputs, the edge detection has to be delayed via configuration registers (see registers
R1101 and R1111). In case of 50 Hz, this value should be set to at least 40 ms in order to avoid the
counting of false detections. The maximum counter value when using a prescaler of 1 is 65,535 (which is
equivalent to 216-1).
There is a register that displays whether and which DI has changed since the last time this register has
been read. When reading this register, all bits are reset to zero automatically. If a DI's status has altered
several times, e.g. from 0 to 1 and back to 0, a change will be signalized, anyway.
Regarding the system configuration (addressing, max. number of modules connected to a MODBus
Master, installation, connection to the bus etc.), please follow the instructions in the chapter Configuration.
Important technical data:
Power supply: 24 V AC or DC, connection via terminals
Current consumption: typically 68 mA (DC), 152 mA (AC) with all relay outputs activated
Specifications digital outputs: Relay outputs (NO contact), max. 250 VAC)
Characteristics (Resistive Load):
Initial contact resistance 100mΩ(at 1A / 24 VDC)
Rated load 3 A at 250 VAC / 30 VDC
Max. switching voltage 277 VAC, 30 VDC
Max. switching capacity 830 VA (AC), 90 W (DC)
Endurance 1x105ops (Rated Load)
Inductive loads should be avoided as far as possible, or be suppressed at the source,
respectively
Overview terminal assignment:
romod 4 DIO-R eco
GND
24V AC/DC
COM DI 1…4
DO No. 1-4
Terminal:
10
11
12
13
14
15
16
17
DI No. 1-4 and COM
Terminal:
23
24
25
26
27
Power supply
Terminal:
1
2
Important: The signals to be switched must have the same phasing.
Bus connection
Terminal No.
I-GND
3
Net A (–) aka /D
4
Net B (+) aka D
5
DO 1
DO 2
DO 3
DO 4

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Subject to technical changes
5.5 Digital output module with relay outputs 4 DO-R eco
The digital output module romod 4 DO-R eco is
a Remote I/O Device which is used to control
four lighting circuits, or other digital actuators.
The relay outputs provide the normally open
contact of each relay and will be contacted via
terminals. They are implemented using bistable
relays.
All digital outputs can be configured so that they
will assume a defined state (‘safe state’) if the
module has not received valid bus telegrams via
the MODBus for a certain time. These
predefined states are set separately for each
output, whereas the time until activating the safe
state is common for all outputs of a module.
Note: The time for triggering the 'safe state'
should not be too short in order to avoid
malfunctions as they can occur, e.g., when
another device which is connected to the bus
fails and will so cause time-outs.
Furthermore, a delay time can be defined, which must elapse between the switching of two outputs at least.
Thus, the system perturbations resulting from the switching operations can be reduced.
Regarding the system configuration (addressing, maximum number of modules connected to a MODBus
Master interface, installation, connection to the bus etc.), please follow the instructions in the chapter
Configuration.
Important technical data:
Power supply: 24 V AC or DC, connection via terminals
Current consumption: typically 14 mA (DC), 40 mA (AC)
Specifications digital outputs: Relay outputs (NO contact), max. 250 VAC)
Characteristics (Resistive Load):
Initial contact resistance 100mΩ(at 1A / 6 VDC)
Minimum switching current 100mA (at min. 5 VDC)
Rated load 16 A at 250 VAC
Max. switching voltage 277 VAC
Max. switching capacity 4432 VA (AC)
Endurance 2.5x104ops (Rated Load)
Inductive loads should be avoided as far as possible, or be suppressed at the source,
respectively.

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Overview terminal assignment:
romod 4 DO-R eco
Output voltages of DOs are potential-free
GND
24V AC/DC
not used
not used
DO No. 1-4
Terminal:
10
11
12
13
14
15
16
17
Power supply
Terminal:
1
2
Bus connection
Terminal No.
I-GND
3
Net A (–) aka /D
4
Net B (+) aka D
5
DO 4
DO 2
DO 3
DO 1

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Subject to technical changes
5.6 Analog input module 8 AI eco
The analog input module romod 8 AI eco is used
for connecting and measuring of up to eight
analog sensor values.
The sensors will be connected to the module via
terminals.
The reference potential for the analog inputs is
available at the GND terminals. For two AIs there
is available one GND terminal in each case. All
ground pins are connected to each other
internally and to the GND of the power supply, as
well.
Active signals (0-10V) as well as various passive
sensor types (e.g. Pt1000, Ni1000) may be
connected to the module.
Unused inputs should be configured for 0-10V
signals and connected to GND potential.
Regarding the system configuration (addressing,
maximum number of modules connected to a
MODBus Master interface, installation,
connection to the bus etc.), please follow the
instructions in the chapter Configuration.
Supported types of sensors:
Type of
sensor
Measured range
Unit of the measured
value
from
to
0..10 V
0 V
10 V
mV (1000 = 1,000 V)
0…5 k
0 
5000 
/10 (1000 = 100,0 )
0…15 k
0 
15000 
(1000 = 1000 )
Pt 100
-50,0 °C
199,9 °C
°C/10 (1000 = 100,0 °C)
Pt 1000
-50,0 °C
199,9 °C
°C/10 (1000 = 100,0 °C)
Ni 1000
-50,0 °C
199,9 °C
°C/10 (1000 = 100,0 °C)
Ni 1000 L&G
-50,0 °C
199,9 °C
°C/10 (1000 = 100,0 °C)
KTY81-110
-55,0 °C
149,9 °C
°C/10 (1000 = 100,0 °C)
KTY81-210
-55,0 °C
149,9 °C
°C/10 (1000 = 100,0 °C)
NTC 20k
-50,0 °C
149,9 °C
°C/10 (1000 = 100,0 °C)
NTC 10k
-50,0 °C
149,9 °C
°C/10 (1000 = 100,0 °C)

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Subject to technical changes
Important technical data:
Power supply: 24 V AC or DC, connection via terminals
Current consumption: max. 40 mA (DC), 80 mA (AC)
Resolution AI 10 Bit
Impedance 20 MΩ
Overview terminal assignment:
romod 8 AI eco
AIs for active sensors 0..10 V and
various types of RTD sensors
GND
24V AC/DC
GND
for AIs
AI No. 1-8
1
2
3
4
5
6
7
8
Terminal:
10
12
13
15
16
18
19
21
GND for AIs
Terminal:
11
14
17
20
Power supply
Terminal:
1
2
Bus connection
Terminal No.
I-GND
3
Net A (–) aka /D
4
Net B (+) aka D
5