OTC I/O Expansion Modules


Fully Customizable Modbus I/O Expansion Solution


I/O Modules not included


  • Fast-commissioning I/O system
  • Serial RS485 connectivity
  • Works with a Modbus master device
  • Fully customizable modular I/O solution
  • Add 0-10 Vdc, 4-20 mA, and or Digital I/O
  • No software, no programming involved
  • Easily mounts onto 35 mm DIN rails
  • Class I, Division 2 (Zone 2)
  • -40 °C to 80 °C 

Quick and Easy I/O Expansion

The OleumTech® Modular I/O Expansion System enables you to instantly add I/O capabilities to any Modbus master device using serial RS485 connectivity. The RS485 I/O Expansion System does not require any software or programming, making it one the of the easiest and quickest local I/O expansion solutions available.

Just Add I/O Modules

Constructing an I/O Expansion System begins with a RS485 Power Module, which is available as a kit. The kit includes the mounting hardware required for installation onto a 35 mm DIN rail. Then, you simply attach up to any five I/O Modules in any desired combination so you can get just the right amount of I/O mix and count. There are three available I/O Modules to choose from: Analog 4-20 mA, Analog 0-10 Vdc, and Digital.


Operational Temperature∙ -40 °C to 80 °C / -40 °F to 176 °F
Ambient Temperature∙ -20 °C to 80 °C / -4 °F to 176 °F
Humidity∙ 0 to 99 %, Non-condensing
Degree of Protection∙ IP20 / Plastic
Safety∙ Class I, Division 2, Groups A, B, C, D T4; Ex nA IIC T4 Gc
∙ Class I Zone 2 AEx nA IIC T4 Gc
∙ ATEX: Sira 15ATEX4134X; Ex nA IIC T4 Gc
∙ IECEx: SIR 15.0055X; Ex nA IIC T4 Gc
Device Functionality∙ Modbus RS485 Local I/O Expansion Solution (No Software Required)
Maximum I/O Module Capacity∙ Max Capacity Depends on I/O Combination Impacting Power
When Using More Than 5 Modules∙ Use Power Budget Calculator http://goo.gl/Z7xC5M
DIN Rail Mounting Compatibility∙ 35 mm x 7.5 mm DIN Rail
DataRail® Included with PM1K∙ 6.1" / 156 mm - Supports Up to Five (5) I/O Modules,
Other DataRail Lengths Also Available
I/O Module Slave ID Selection∙ 16-Position Rotary Switch
DataRail Mounting Hardware∙ 4-Claw Attachment to 35 mm DIN Rail with End Terminal Bracket
Built-In Mounting Hardware∙ Spring-Loaded Clip-On System
Wire Gauge∙ Solid / Stranded (AWG) 28-12 Gauge
Wire Rating∙ UL: 300 V RMS, 80 °C and 300 V, 105 °C / CSA: 300 V RMS, 105 °C
PM1K Package Dimensions (WxHxD)∙ 5.5 x 10.1 x 2.8-in / 140 x 257 x 72 mm
PM1K Package Weight∙ 0.8 lbs / 363 g
I/O Module Package Dimensions (WxHxD)∙ 4.8 x 5.1 x 2.8-in / 123 x 129 x 72 mm
I/O Module Package Weight∙ Single Pack: 0.5 lbs / 227 g; Dual Pack: 0.8 lbs / 363 g
Warranty∙ 2-Year Limited
Baud Rate∙ 9600 bits per second
Data Bits∙ 8
Parity / Stop Bits∙ None / 1
RS485 Modbus Slave Addressing∙ Interface Supports up to 16 Addresses / I/O Modules*
Supply Voltage Range∙ 9 - 30 Vdc (±5 %)
Reverse Polarity Protection∙ Yes
Power Consumption∙ Typical: 20 mA / Max: 24 mA @12 Vdc
Number of Inputs and Outputs∙ 2x Inputs (24-bit Resolution) / 2x Outputs (16-bit Resolution)
Signal Range∙ 0 Vdc to 10 Vdc (10.5 V Max)
Isolation Voltage∙ 2500 V r.m.s.
Accuracy∙ < 0.1 % of Full Scale
AI Input Impedance∙ 40K ohm
AO Output Impedance∙ 10 ohm
Power Consumption∙ Typical: 40 mA / Max: 45 mA @12 Vdc
Number of Inputs and Outputs∙ 2x Inputs (24-bit Resolution) / 2x Outputs (16-bit Resolution)
Signal Range∙ 4 mA to 20 mA
Isolation Voltage∙ 2500 V r.m.s.
Accuracy∙ < 0.2 % of Full Scale
Internal Loop Power∙ +13.5 Vdc
Maximum Current∙ 84 mA @ 12 Vdc
AI Input Impedance (loop)∙ 128 ohm
AO Terminal Voltage Range∙ 10 Vdc Min. / 31.5 Vdc Max.
Power Consumption∙ Typical: 50 mA / Max: 75 mA @12 Vdc
Number of Inputs and Outputs∙ 4x Inputs / 4x Outputs
Input Voltage Range∙ 3-30 Vdc
Isolation Voltage∙ 2500 V r.m.s.
Input Voltage Threshold∙ Signal ("H"): > 2.3 Vdc / 0 Signal ("L"): < 1.1 Vdc
Output Rating∙ 1 A Sink Current for Open-Drain Outputs / NPN
Green LEDs∙ Line-Driven Input Indicators
Red LEDs∙ Output Indicators
Power Consumption∙ Typical: 18 mA / Max: 26 mA @12 Vdc
RS485 I/O Expansion Kit∙ BM-1000-PM1K (I/O Modules not included)
0-10 V I/O Module∙ BM-A010-122S (Single Pack) / BM-A010-122D (Dual Pack)
4-20 mA I/O Module∙ BM-A420-122S (Single Pack) / BM-A420-122D (Dual Pack)
Digital I/O Module∙ BM-D100-144S (Single Pack) / BM-D100-144D (Dual Pack)