HMS 4RO User manual

Netbiter
®IO Extender
4RO | 6RTD | 8DIO | DAIO | 8AIV | 8AIIS
USER MANUAL
HMSI-27-228 3.1 ENGLISH

Important User Information
Liability
Every care has been taken in the preparation of this document. Please inform HMS Industrial Networks AB of any
inaccuracies or omissions. The data and illustrations found in this document are not binding. We, HMS Industrial
Networks AB, reserve the right to modify our products in line with our policy of continuous product development.
The information in this document is subject to change without notice and should not be considered as a commit-
ment by HMS Industrial Networks AB. HMS Industrial Networks AB assumes no responsibility for any errors that
may appear in this document.
There are many applications of this product. Those responsible for the use of this device must ensure that all the
necessary steps have been taken to verify that the applications meet all performance and safety requirements in-
cluding any applicable laws, regulations, codes, and standards.
HMS Industrial Networks AB will under no circumstances assume liability or responsibility for any problems that
may arise as a result from the use of undocumented features, timing, or functional side effects found outside the
documented scope of this product. The effects caused by any direct or indirect use of such aspects of the product
are undefined, and may include e.g. compatibility issues and stability issues.
The examples and illustrations in this document are included solely for illustrative purposes. Because of the many
variables and requirements associated with any particular implementation, HMS Industrial Networks AB cannot as-
sume responsibility for actual use based on these examples and illustrations.
Intellectual Property Rights
HMS Industrial Networks AB has intellectual property rights relating to technology embodied in the product de-
scribed in this document. These intellectual property rights may include patents and pending patent applications in
the USA and other countries.
eWON®, Netbiter®, and Netbiter Argos®are registered trademarks of HMS Industrial Networks AB. All other trade-
marks mentioned in this document are the property of their respective holders.
Netbiter®IO Extender User Manual HMSI-27-228 3.1

Netbiter®IO Extender User Manual HMSI-27-228 3.1
Table of Contents Page
1 Preface ............................................................................................................................... 3
1.1 About This Document.....................................................................................................3
1.2 Document history...........................................................................................................3
1.3 Document Conventions ..................................................................................................4
2 Overview............................................................................................................................ 5
2.1 Introduction ...................................................................................................................5
2.2 Data acquisition .............................................................................................................5
2.3 Selection Guide .............................................................................................................5
3 General/Common Characteristics .............................................................................. 6
3.1 Dimensions ...................................................................................................................6
3.2 Common Specifications..................................................................................................6
3.3 EMC Considerations ......................................................................................................7
3.4 Network Termination ......................................................................................................7
3.5 DIP Switches.................................................................................................................7
3.6 Modbus Node ID Setting.................................................................................................8
3.7 Communication Settings.................................................................................................9
4 IOX-4RO – Relay Outputs............................................................................................ 10
4.1 Description ..................................................................................................................10
4.2 Technical Specifications ...............................................................................................10
4.3 Status Indicators..........................................................................................................10
4.4 Wiring ......................................................................................................................... 11
4.5 DIP Switch Settings......................................................................................................12
4.6 Data Registers.............................................................................................................12
5 IOX-6RTD – RTD Inputs ............................................................................................... 13
5.1 Description ..................................................................................................................13
5.2 Technical Specifications ...............................................................................................13
5.3 Wiring .........................................................................................................................14
5.4 Status Indicators..........................................................................................................15
5.5 DIP Switch Settings......................................................................................................15
5.6 Data Registers.............................................................................................................16

Netbiter®IO Extender User Manual HMSI-27-228 3.1
Table of Contents
6 IOX-8DIO – Digital Inputs/Outputs ............................................................................ 17
6.1 Description ..................................................................................................................17
6.2 Technical Specifications ...............................................................................................17
6.3 Wiring .........................................................................................................................18
6.4 Status Indicators..........................................................................................................19
6.5 DIP Switch Settings......................................................................................................19
6.6 Jumper Settings...........................................................................................................20
6.7 Data Registers ............................................................................................................21
7 IOX-DAIO – Digital and Analog Inputs/Outputs..................................................... 23
7.1 Description ..................................................................................................................23
7.2 Technical Specifications ...............................................................................................25
7.3 Status Indicators..........................................................................................................26
7.4 Wiring .........................................................................................................................27
7.5 DIP Switch Settings......................................................................................................27
7.6 Jumper Settings...........................................................................................................28
7.7 Data Registers.............................................................................................................29
8 IOX-8AIV – Analog Voltage Inputs ............................................................................ 30
8.1 Description ..................................................................................................................30
8.2 Technical Specifications ...............................................................................................30
8.3 Status Indicators..........................................................................................................30
8.4 Wiring .........................................................................................................................31
8.5 DIP Switch Settings......................................................................................................32
8.6 Data Registers.............................................................................................................32
9 IOX-8AIIS – Isolated Analog Current Inputs ........................................................... 34
9.1 Description ..................................................................................................................34
9.2 Technical Specifications ...............................................................................................34
9.3 Status Indicators..........................................................................................................34
9.4 Wiring .........................................................................................................................35
9.5 DIP Switch Settings......................................................................................................36
9.6 Data Registers.............................................................................................................36
A Regulatory Compliance............................................................................................... 39

Preface 3 (40)
1 Preface
1.1 About This Document
This manual describes how to install and configure Netbiter IO Extender modules.
For additional documentation and software downloads, FAQs, troubleshooting guides and tech-
nical support, please visit www.netbiter.com/support.
1.2 Document history
Version Date Description
2.00 Sep 2015 Multiple corrections and updates, new layout
3.0 2016-10-11 Rebranded and updated compliance info
3.1 2017-10-25 Minor corrections
Netbiter®IO Extender User Manual HMSI-27-228 3.1

Preface 4 (40)
1.3 Document Conventions
Ordered lists are used for instructions that must be carried out in sequence:
1. First do this
2. Then do this
Unordered (bulleted) lists are used for:
• Itemized information
• Instructions that can be carried out in any order
...and for action-result type instructions:
► This action...
➨leads to this result
Bold typeface indicates interactive parts such as connectors and switches on the hardware, or
menus and buttons in a graphical user interface.
Monospaced text is used to indicate program code and other
kinds of data input/output such as configuration scripts.
This is a cross-reference within this document: Document Conventions, p. 4
This is an external link (URL): www.hms-networks.com
This is additional information which may facilitate installation and/or operation.
This instruction must be followed to avoid a risk of reduced functionality and/or
damage to the equipment, or to avoid a network security risk.
Caution
This instruction must be followed to avoid a risk of personal injury.
WARNING
This instruction must be followed to avoid a risk of death or serious injury.
Netbiter®IO Extender User Manual HMSI-27-228 3.1

Overview 5 (40)
2 Overview
2.1 Introduction
The Netbiter I/O Extender series provides a solution for distributed I/O requirements. The I/O
system consists of stand-alone digital and analog input/output modules connected together on
a RS-485 two-wire multi-drop network.
The modules communicate using the Modbus RTU protocol. The 32-bit ARM CPU in the mod-
ule provides high speed data processing and fast communication turnaround times. Multiple
baud rates are selectable, from 2400 to 115200 baud.
All I/O modules fit directly onto an industry standard DIN rail. All modules have a minimum isola-
tion of 1000 VAC rms between the field and logic.
The modules are equipped with status LEDs to indicate the status of the inputs and outputs.
This visual indication assists with fault finding and diagnostics.
2.2 Data acquisition
The primary use of the Netbiter I/O Extender modules is for data acquisition in combination with
a Netbiter EC or WS gateway. The Netbiter gateway acts as a Modbus master which retrieves
and sends data from the Netbiter I/O Extender modules.
120 Ω
Termination
120 Ω
Termination
RS-485 network
Netbiter EC or WS
(Modbus Master)
Netbiter IOX Extenders (Modbus Slaves)
QUERY
REPLY
Fig. 1 Overview
2.3 Selection Guide
Module Type
IOX-4RO 4 relay outputs
IOX-8DIO 8 digital inputs / 8 digital outputs
IOX-6RTD 6 RTD inputs – PT100, Ni120, PT1000, Ni1000, Ni1000LG & Ohms
IOX-DAIO 2 RTD inputs, 2 analog inputs 0(4)-20mA or 0(2)-10V
1 analog output 0(4)-20mA or 0(2)-10V
4 digital inputs, 2 digital outputs
IOX-8AIV 8 analog inputs, 0(2)-10V
IOX-8AIIS 8 fully isolated analog inputs, 0(4)-20mA
Netbiter®IO Extender User Manual HMSI-27-228 3.1

General/Common Characteristics 6 (40)
3 General/Common Characteristics
3.1 Dimensions
• The module clips directly onto an industry standard DIN rail (EN 50022).
• Field wiring is on the front of the module via a plug-in connector.
• Module power and RS-485 communications wiring are on a separate plug-in connector on
the bottom side of the housing.
• Allow at least 25 mm in front of and below the module to accommodate the wiring.
• Ensure that the space above and below the module is sufficient to provide adequate
ventilation.
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
1
1C
1NC
2NC
2C
2NC
2NC
3C
3NC
3NC
4C
4NC
4NC
P R T
1234
Fig. 2 Netbiter I/O Extender enclosure
3.2 Common Specifications
Operating temperature -10 °C to +50 °C
Storage temperature -40 °C to +85 °C
Humidity 5–95 % RH, non-condensing
This product contains parts that can be damaged by electrostatic discharge (ESD).
Use ESD protective measures to avoid equipment damage.
Netbiter®IO Extender User Manual HMSI-27-228 3.1

General/Common Characteristics 7 (40)
3.3 EMC Considerations
The I/O modules will usually be installed in an enclosure along with other devices that generate
electromagnetic radiation, such as relays and contactors, transformers, motor controllers, etc.
Electromagnetic radiation can induce electrical noise in both power and signal lines. Direct radi-
ation into the module can also have a negative effect on the system.
Appropriate grounding, shielding and other protective steps should be taken at the installation
stage to prevent interference. Protective steps include control cabinet grounding, module
grounding, cable shield grounding, protective elements for electromagnetic switching devices,
correct wiring, as well as the consideration of cable types and their cross sections.
• Use screened twisted pair RS-485 cable with the screen grounded at one point.
• Use screened I/O, T/C, and RTD cables, with the screens grounded at one point as close
as possible to the I/O module.
3.4 Network Termination
Transmission line effects often present a problem on data communication networks. These
problems include reflections and signal attenuation.
If it should be necessary to eliminate reflections from the ends of the cable, the cable can be ter-
minated with a resistor across the line equal to its characteristic impedance. Both ends should
be terminated, as propagation is bi-directional. In the case of an RS-485 twisted pair cable, this
termination is typically 120 Ohms.
3.5 DIP Switches
1
ON
234567890
Fig. 3 DIP switches
DIP Switch Functions
Switch Function
1–7 Modbus Node ID
See Modbus Node ID Setting, p. 8
8Module specific settings.
9
0 Baud rate: OFF = 9600, ON = programmed
See Communication Settings, p. 9
The status of the DIP switches is stored in register 30100.
MSB DIP Switch Status Register LSB Address
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
32768 16384 8192 4096 2048 1024 512 256 128 64 32 16 8 4 2 1 30100
— — — — — — 0 9 8 7 6 5 4 3 2 1
DIP Switches
Netbiter®IO Extender User Manual HMSI-27-228 3.1

General/Common Characteristics 8 (40)
3.6 Modbus Node ID Setting
Switches 1 to 7 are used to set the Modbus Node ID as shown in this table.
All modules will respond to a default Node ID of 254.
Fig. 4 Node ID DIP switch chart
Netbiter
®IO Extender User Manual HMSI-27-228 3.1

General/Common Characteristics 9 (40)
3.7 Communication Settings
The data in the modules is stored in 16-bit registers. These registers are accessed over the net-
work using the Modbus RTU communication protocol.
DIP Switch 0 setting OFF (Default) ON (Programmed Baud Setting)
Baud rate 9600 2400, 4800, 9600, 19200, 38400, 57600, 115200
Data bits 8 8
Parity None None, Even, Odd
Stop bits 1 1, 2
3.7.1 Communication Settings Registers
Modbus
Register
Register
Name
Low
Limit
High
Limit
Ac-
cess
Comments
40121 Baud Rate 2400 11520 R/W 2400, 4800, 9600, 19200, 38400,57600,11520
40122 Parity 0 2 R/W 0 = none, 1 = even, 2 = odd
40123 Stop Bits 1 2 R/W 1 = 1 stop bit, 2 = 2 stop bits
40124 Reply Delay 0 65535 R/W (x10ms)
The baud rate value is programmed directly into the baud rate register. The only exception is
the 115200 baud rate, where the value 11520 is used.
The reply delay is a time delay between the Modbus message being received to the reply being
sent. In some applications where a modem or radio is used in the RS-485 network, it may be
necessary to add a reply delay due to turnaround delays in the equipment.
Time (x 10 ms)
Rx Query
Tx Reply
Reply Delay
Fig. 5 Reply delay
Reply delay works only when DIP switch 0 is set to ON.
3.7.2 Supported Modbus Functions
Function Code Modbus Function Comment
1 Read Coil Status Digital inputs/outputs
2 Read Input Status Digital inputs/outputs
3 Read Holding Registers Analog inputs/outputs
4 Read Input Registers Analog inputs/outputs
5Write Single Coil Digital outputs
6 Write Single Register Analog outputs
15 Write Multiple Coils Digital outputs
16 Write Multiple Registers Analog outputs
The Modbus message length must be limited to 100 consecutive read or write registers. If more
registers are required, a new poll group must be added.
Netbiter®IO Extender User Manual HMSI-27-228 3.1

IOX-4RO – Relay Outputs 10 (40)
4 IOX-4RO – Relay Outputs
4.1 Description
The IOX-4RO module has 4 normally open/closed relay outputs. This module may be used for
a higher drive capability, or when isolation between outputs is required.
When switch 9 is OFF, the module is configured as a Modbus slave and the outputs are written
to by the Modbus master (PC/PLC/HMI). Each output on the module can be individually
switched ON or OFF, or all outputs can be set up at the same time by writing a single number to
the output register that represents the status of all outputs.
An output watchdog timer can be configured to switch off all outputs if there has been no com-
munication with the module for up to 255 seconds. A value of 0 seconds will disable this timer
and the outputs will remain in the last programmed state.
4.2 Technical Specifications
Power supply Logic supply voltage 24 VDC
Logic supply current 42 mA
Relay outputs Output points 4
Maximum current 0.5 A @ 220 VAC / 1 A @ 28 VDC
Isolation 1000 Vrms between field and logic
1000 Vrms between outputs
Temperature Operating temperature. -10 °C to + 50 °C
Storage temperature -40 °C to + 85 °C
Connectors Logic power and comms. 4-pin connector on underside of unit
Outputs 18-way screw connector on front
4.3 Status Indicators
1234
P R T
RS-485 Rx RS-485 TxPower
Outputs 1 – 4
Fig. 6 IOX-4RO Status Indicators
Power Indicates that the CPU is running.
RS-485 Rx Flashes to indicate that the unit has received a valid Modbus message.
RS-485 Tx Flashes to indicate that the unit has sent a Modbus message.
Outputs 1–4 OFF when the output is off, ON when the output is on.
Netbiter
®IO Extender User Manual HMSI-27-228 3.1

IOX-4RO – Relay Outputs 11 (40)
4.4 Wiring
Do not reverse the power/communications connections as this may damage the
unit.
1
3
4
2
Pin Connection
24 VDC @ 42 mA
RS-485
-
+
A
B
Fig. 7 IOX-4RO power and RS-485 wiring
Relay 1 Common
Relay 1 Normally Open
Relay 1 Normally Closed
Relay 2 Common
Relay 2 Normally Open
Relay 2 Normally Closed
Relay 3 Common
Relay 3 Normally Open
Relay 3 Normally Closed
Relay 4 Common
Relay 4 Normally Open
Relay 4 Normally Closed
+24 VDC / 220 VAC
0 VDC / 220 VAC
RELAY
+
-
Fig. 8 IOX-4RO relay wiring example
Netbiter
®IO Extender User Manual HMSI-27-228 3.1

IOX-4RO – Relay Outputs 12 (40)
4.5 DIP Switch Settings
Switch Function Description
1–7 NODE ID Modbus Node ID — See Modbus Node ID Setting, p. 8
8-Not used
9 MODE Slave (OFF)
0 BAUD RATE OFF = 9600, ON = programmed. See Communication Settings, p. 9.
4.6 Data Registers
MODULE TYPE = 113
Modbus
Register
Register Name Low
Limit
High
Limit
Access Comments
00001 Relay Output 1 0 1 R/W
Status of Digital Outputs.
00002 Relay Output 2 0 1 R/W
00003 Relay Output 3 0 1 R/W
00004 Relay Output 4 0 1 R/W
30001 S/W Version /
Module Type
N/A N/A R High Byte = Software Version
Low byte = 113
40002 Digital Outputs N/A N/A R/W Digital Outputs in bits. 4(msb) - 1(lsb).
30100 DIP Switch 0 65535 R Status of DIP switch on front panel
40101 Watchdog Timer 0 255 R/W Timer in seconds.
0 = disabled. 1–255 = enabled.
40121 Baud Rate 2400 11520 R/W 2400, 4800, 9600,19200, 38400, 57600,
115200
(115200 is entered as 11520)
40122 Parity 0 2 R/W 0 = none, 1 = even, 2 = odd
40123 Stop Bits 1 2 R/W 1 = 1 stop bit, 2 = 2 stop bits
40124 Reply Delay 0 65535 R/W 0 = Disable, >0 = Enable (x10 ms)
4.6.1 Relay Output Register
The relay outputs can be read/written in a single register as follows:
MSB IOX-4RO Relay Outputs LSB Address
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
32768 16384 8192 4096 2048 1024 512 256 128 64 32 16 8 4 2 1 40002
— — — — — — — — — — — — 4 3 2 1
Relay Output Number
4.6.2 Output Watchdog Timer
The watchdog timer is used to switch off all outputs in the event of a communications failure.
When register 40101 is set to zero, the watchdog timer is disabled.
Netbiter®IO Extender User Manual HMSI-27-228 3.1

IOX-6RTD – RTD Inputs 13 (40)
5 IOX-6RTD – RTD Inputs
5.1 Description
The IOX-6RTD is a 6 RTD input module that can accommodate 2 or 3-wire RTD sensors. The
RTD inputs are isolated from the logic.
The RTD resistance is read by the module circuitry, linearised and converted to degrees Cel-
sius. No ranging is required, as the module covers the full range of the RTD, as indicated in the
RTD table. The value read from the Modbus register is the actual temperature with 0.1 °C reso-
lution. i.e., a value of 3451 corresponds to a temperature of 345.1 °C.
The RTD type is set up by writing a value to the RTD Type register. The value is obtained from
the table below. For example, to select PT100 RTD, the value “1” must be written to the RTD
Type register. All 6 RTD inputs adopt the same RTD type.
DIP switch 9 is used to select upscale or downscale burnout for break detection. A value of
32768 is used to indicate upscale burnout and a value of -32767 indicates downscale burnout.
As there is no inter-channel isolation, isolated RTD:s must be used in order to
prevent ground loops and read errors.
5.2 Technical Specifications
Power supply Logic supply voltage 12–24 VDC
Logic supply current 87 mA @ 12 V / 45 mA @ 24 V
RTD inputs Input points 6
RTD configuration 2- or 3-wire
Resolution 0.1 °C
Drift 100 ppm/°C typical
Line resistance effect < 0.1 °C balanced
Max. line resistance 100 Ohms
Isolation 1500 Vrms between field and logic
RTD type Number Type Range Accuracy
1 Pt100 -200 to +850 °C ±0.3 °C IEC
751:1983
2 Ni120 -80 to +320 °C ±0.3 °C
3 Pt1000 -200 to +850 °C ±0.3 °C
4 Ni1000 (DIN) -200 to +850 °C ±0.3 °C
5 Ni1000
(Landis+Gyr)
-200 to +850 °C ±0.3 °C
6 Ohms 10–400 Ω ±0.05 %
7Ohms 100–4000 Ω ±0.05 %
Temperature Operating temperature -10 °C to + 50 °C
Storage temperature -40 °C to + 85 °C
Connectors Logic power and comms. 4-pin connector on underside of unit
Outputs 18-way screw connector on front
Netbiter®IO Extender User Manual HMSI-27-228 3.1

IOX-6RTD – RTD Inputs 14 (40)
5.3 Wiring
Do not reverse the power/communications connections as this may damage the
unit.
1
3
4
2
12 VDC @ 87 mA
Pin Connection
24 VDC @ 45 mA
RS-485
-
+
A
B
Fig. 9 IOX-6RTD power and RS-485 wiring
Input 1a
1bInput
Input 1c
2aInput
Input 2b
2cInput
Input 3a
3bInput
Input 3c
4aInput
Input 4b
4cInput
Input 5a
5bInput
Input 5c
6aInput
RTD
3 Wire
Input 6b
6cInput
RTD
2 Wire
Fig. 10 IOX-6RTD input wiring example
Netbiter
®IO Extender User Manual HMSI-27-228 3.1

IOX-6RTD – RTD Inputs 15 (40)
5.4 Status Indicators
1234
5 6
P R T
Inputs 1 – 6
RS-485 Rx RS-485 TxPower
Fig. 11 IOX-6RTD Status Indicators
Power Indicates that the CPU is running.
RS-485 Rx Flashes to indicate that the unit has received a valid Modbus message.
RS-485 Tx Flashes to indicate that the unit has sent a Modbus message.
Inputs 1–6 ON when the RTD is open circuit, OFF when the RTD is connected.
5.5 DIP Switch Settings
Switch Function Description
1–7 NODE ID Modbus Node ID — See Modbus Node ID Setting, p. 8
8-Not used
9 BREAK RTD break. When switched OFF, the RTD value will be -32767 when the RTD
is faulty. When set to ON, the RTD value will be 32768.
0 BAUD RATE OFF = 9600, ON = programmed. See Communication Settings, p. 9.
Netbiter®IO Extender User Manual HMSI-27-228 3.1

IOX-6RTD – RTD Inputs 16 (40)
5.6 Data Registers
MODULE TYPE = 109
Modbus
Register
Register Name Low
Limit
High
Limit
Access Comments
30001 S/W Version /
Module Type
N/A N/A R High Byte = Software Version
Low byte = 109
30002 RTD Input 1 R
For ranges,see Technical Specifications,
p. 13.
30003 RTD Input 2 R
30004 RTD Input 3 R
30005 RTD Input 4 R
30006 RTD Input 5 R
30007 RTD Input 6 R
30008 Input Status 0 65535 R bit1 = 0 (OK)
bit1 = 1 (Error or open circuit)
30100 DIP Switch 0 65535 R Status of DIP switch on front panel
40101 RTD Type 1 7 R/W See Technical Specifications, p. 13.
40102 Line Frequency 50 60 R/W Line frequency
40103 Units Type 1 2 R/W 1 = °C, 2 = °F
40121 Baud Rate 2400 11520 R/W 2400, 4800, 9600, 19200,
38400,57600,115200
40122 Parity 0 2 R/W 0 = none, 1 = even, 2 = odd
40123 Stop Bits 1 2 R/W 1 = 1 stop bit, 2 = 2 stop bits
40124 Reply Delay 0 65535 R/W 0 = Disable, >0 = Enable. (x10 ms)
5.6.1 RTD Input Status
There is one status bit associated with each RTD input. These bits are used to indicate if the in-
put is open circuit or over range, and if so the error bit will be set.
Bit 1 – Error Bit 2 – Not used Condition Status LED
0 0 Input working OK LED OFF
1 0 Open circuit/Over range LED ON
DIP Switch Status Register (30100)
MSB IOX-6RTD Input Status LSB Address
15 14 13 12 11 10 9 8 7 6 5 4 3 2 1 0
32768 16384 8192 4096 2048 1024 512 256 128 64 32 16 8 4 2 1 30008
RTD6 Error
RTD5Error
RTD4 Error RTD3 Error RTD2 Error RTD1 Error
Netbiter®IO Extender User Manual HMSI-27-228 3.1

IOX-8DIO – Digital Inputs/Outputs 17 (40)
6 IOX-8DIO – Digital Inputs/Outputs
6.1 Description
The IOX-8DIO module has 8 digital inputs and 8 digital outputs. The inputs are isolated from the
logic by bi-directional opto-couplers. The common is connected internally to either the +V or -V
field power supply terminals, using a jumper inside the housing.
The inputs have internal counters associated with them. These are 32-bit counters allowing a
count value in the range 0-4294967295. This value can be cleared by writing a zero to the asso-
ciated registers, or it can be preset to any other value using the same method.
The count values will be lost if power is disconnected.
The format of the registers allows the status of the inputs to be read either as single bits, or all
at once as a single register on the Modbus network.
The 8 digital outputs are of the type open collector (NPN). These may be used to drive lamps or
external relays when more drive capability is required. The outputs are isolated from the logic
and they share a common negative terminal.
When switch 9 is OFF, the module is configured as a Modbus slave and the outputs are written
to by the Modbus master (PC/PLC/HMI). Each output on the module can be individually
switched ON or OFF, or all outputs can be set up at the same time by writing a single number to
the output register that represents the status of all outputs.
6.2 Technical Specifications
Power supply Logic supply voltage 12–24 VDC
Logic supply current 33 mA @ 12 V / 19 mA @ 24 V
Field supply voltage 12–24 VDC
Field supply current 6 mA @ 12 V / 6 mA | 24 V
Digital inputs Input points 8
Input voltage range 12–24 VDC
Input current per input 5 mA @ 12 V / 11 mA @ 24 V
Isolation 1500 Vrms between field and logic
Digital outputs Output points 8
Maximum voltage 36 VDC
Maximum current 100 mA per output
VCEon 1.1 V (max)
Isolation 1500 Vrms between field and logic
Counters Inputs 1 to 16
Resolution 32 bits
Frequency 1 KHz (max)
Pulse width 500 µs (min)
Temperature Operating temperature -10 °C to + 50 °C
Storage temperature -40 °C to + 85 °C
Connectors Logic power and comms. 4-pin connector on underside of unit
Outputs 18-way screw connector on front
Inputs 1 to 8 are used both as digital inputs and counter inputs.
Netbiter®IO Extender User Manual HMSI-27-228 3.1

IOX-8DIO – Digital Inputs/Outputs 18 (40)
6.3 Wiring
Do not reverse the power/communications connections as this may damage the
unit.
1
3
4
2
12 VDC @ 33 mA
Pin Connection
24 VDC @ 19 mA
RS-485
-
+
A
B
Fig. 12 IOX-8DIO power and RS-485 wiring
Input 1
Input 2
Input 3
Input 4
Input 5
Input 6
Input 7
Input 8
Output 1 +12–24 VDC or 0 VDC
+12–24 VDC
0 VDC
+V
0V
+12–24 VDC
RELAY
+
-
Output 2
Output 3
Output 4
Output 5
Output 6
Output 7
Output 8
( Set internal jumper )
Fig. 13 IOX-8DIO input/output wiring example
Netbiter
®IO Extender User Manual HMSI-27-228 3.1