Home » 8 Analog 4-20mA/0-10V Outputs for Raspberry Pi Back I/O Panel
8 Analog 4-20mA/0-10V Outputs for Raspberry Pi I/O Back Panel
8 Analog 4-20mA/0-10V Outputs Layout
8 Analog 4-20mA/0-10V Outputs Side View
8 Analog 4-20mA/0-10V Outputs Back View
16 Analog 4–20 mA Outputs Card Enclosure
16 Analog 4–20 mA Outputs Card Enclosure
8 Analog 4-20mA/0-10V Outputs for Raspberry Pi I/O Back Panel
8 Analog 4-20mA/0-10V Outputs Layout
8 Analog 4-20mA/0-10V Outputs Side View
8 Analog 4-20mA/0-10V Outputs Back View
16 Analog 4–20 mA Outputs Card Enclosure
16 Analog 4–20 mA Outputs Card Enclosure
SKU: SM-P-141

8 Analog 4-20mA/0-10V Outputs for Raspberry Pi Back I/O Panel

Eight Analog Outputs with software selectable 4-20mA or 0-10V for Raspberry Pi I/O Back Panel. Command Line, Python, RS485 MODBUS, OpenPLC, and CODESYS.

Coming soon
$100.00

The 8 Analog 4-20mA/0-10V Outputs Card for Raspberry Pi Back Panel features eight analog outputs routed to the Back Panel terminal blocks. Designed for maximum flexibility, each output can be individually configured as either 4-20mA or 0-10V drive.

Seamlessly integrated with the Raspberry Pi Back Panel, the card supports Command Line, MODBUS RTU over RS485, OpenPLC, and CODESYS.

FEATURES

  • 8 Analog Output Channels
    Each channel can be individually programmable as 4-20mA or 0-10V

  • Seamless Raspberry Pi Integration
    Plugs directly into the Raspberry Pi Back Panel — no additional wiring or hardware needed.

  • Expandable Stack Design
    Stack up to 8 identical modules horizontally for larger projects.

  • MODBUS Support via RS485
    Integrated RS485 port allows MODBUS RTU communication for easy industrial integration.

  • CAN Support via CANopen
    Integrated CAN interface enables reliable CANopen communication for seamless industrial networking and real-time device control.

  • Real-Time Status LEDs
    Input and output LED indicators provide immediate visual feedback.

  • Built-in OLED Display
    128×32 dot matrix screen for displaying system status, messages, or sensor values.

  • Cross-Platform Software Support
    Includes Python library and command-line tools for rapid development.

  • OpenPLC & CODESYS Compatible
    Industrial-grade compatibility with both OpenPLC and CODESYS environments.

  • No Export Restrictions
    ECCN classification EAR99 — freely exportable under U.S. regulations.

DESCRIPTION

Part of the HOP (Hardware On Panel) family developed by Sequent Microsystems, the 8 Analog 4-20mA/0-10V Outputs Card is designed to integrate seamlessly with the Raspberry Pi Back Panel. Up to eight HOP cards—of any type—can be installed on a single Back Panel, offering maximum flexibility for industrial automation applications. Multiple Back Panels can be connected horizontally to support larger projects.

Each output can be configured in software as either 4-20mA or 0-10V - no jumpers or DIP switches required.

Like all HOP cards, the 8 Analog 4-20mA/0-10V Outputs Card features 18 LED indicators. The power LED blinks when power is applied and the local processor is operational. An error LED illuminates when the dedicated PANIC pin on the Back Panel terminal block is activated. Sixteen additional LEDs display the real-time status of each output, also indicating whether the output is in 4-20mA or 0-10V mode.

An RS485 port enables communication with external PLCs or industrial controllers using the industry-standard MODBUS RTU protocol.

Power Requirements

The 8 Analog 4-20mA/0-10V Outputs Card is powered via the Back Panel power connector.

  • Outputs are power from the 24V supply and can draw up to 200mA

  • The local processor is powered from the 5V rail through a 3.3V LDO regulator and consumes 10 mA.

Error Processing

One pin on the spring-loaded terminal block of the Back Panel is reserved for signaling an error condition. The user can connect this pin to an external contact of their choice. When the error signal is activated, the 8-Channel Analog Analog Outputs Card automatically resets all outputs to a predefined default state.

WATCHDOG: If the watchdog is enabled and the Raspberry Pi fails to access the 8-Channel Analog Output Card within the preset time, the card signals the Back Panel, which performs a hard reset of the Raspberry Pi by turning the power off for 10 seconds.

STACK LEVEL: The stack level is automatically determined by the slot into which the card is inserted on the Back Panel. It is shown on the OLED display after power up. Up to eight cards of the same type can be connected to a single Back Panel installation.

INTERRUPT: Any HOP card can be programmed to interrupt the Raspberry Pi. The interrupt handler running on Raspberry Pi needs to monitor pin 37 on the GPIO interface.

BACK PANEL TERMINAL BLOCK PINOUT
Each slot on the Back Panel has alocated three 6-pin spring-loaded terminal blocks for IO wiring. The pinout is shown in the following picture:
Raspberry Pi Backpanel Terminal Block IO

Eight Analog Outputs: Positive side of 4-20mA or 0-10V is routed to the odd number I/O's. Negative side of 4-20mA or ground is routed to the even number.

IO01-IO02: Output #1
IO03-IO04: Output #2
IO05-IO06: Output #3
IO07-IO08: Output #4
IO09-IO10: Output #5
IO11-IO12: Output #6
IO13-IO14: Output  #7
IO15-IO16: Output #8
IO17: ERROR
IO18: PANIC

IO17 is an open drain output triggered by a predefined error condition on an out of bounds input. It can be used to activate an external alarm, or can be routed back to IO18 to reset the outputs to a predefined state.

IO18 is a dry contact to ground input and can be activated by an external contact wired to the Back Panel terminal block. When triggered, it resets all outputs to a predefined state. 

DOT MATRIX DISPLAY
8-Channel Analog Output Card
The Eight 4-20mA Analog Outputs card includes a 128 × 32 dot-matrix display driven by the on-board processor. It can show status information, self-test results, and error messages. At power up it displays the card name and the I2C address.

ELECTRICAL SPECIFICATIONS
  • Power Supply: 5V 10mA; 24V 120mA Back Panel provided
  • Source/Sync outputs: 14bit PWM
MECHANICAL SPECIFICATIONS
Eight Relays Eight Inputs for Raspberry Pi Back Panel Mechanical
 

DOWNLOADS

Hardware Schematic V1.0

2D DXF Mechanical

3D STEP Model

3D Printable Enclosure


SOFTWARE

Command Line Drivers

Python Libraries

CODESYS Driver

OpenPLC Module


QUICK START

  1. Plug the 8 Analog 4-20mA/0-10V Outputs Card on the Back Panel for Raspberry Pi and power up the system.
  2. Enable I2C communication on Raspberry Pi using raspi-config.
  3. Install the software from github.com:
  • git clone https://github.com/SequentMicrosystems/sequent-cli.git
  • cd /home/pi/sequent-cli
  • sudo make install
  • sequent-cli 8analog -h
The program will respond with a list of available commands.

FAQ

Q: What is the function of this card?
A: It provides eight programmable 4–20mA analog outputs, each configurable as a current source or sink, for industrial control applications.

Q: Can I mix this card with other HOP cards on the same Back Panel?
A: Yes, up to eight HOP cards of any type can be installed on a single Back Panel, allowing flexible I/O combinations.

Q: How do I configure outputs as source or sink?
A: Output mode is configured in software—no need for jumpers or DIP switches.

Q: What software platforms are supported?
A: The 8-Channel 4–20 mA Output Card supports MODBUS RTU over RS485, and is compatible with OpenPLC, CODESYS, and Sequent’s command-line utilities.

Q: What do the LEDs indicate?
A: One LED indicates power and processor health, one signals an error (via the PANIC pin), and 16 LEDs display real-time output activity and mode.

Q: How is the card powered?
A: Power is supplied through the 24V rail of the Raspberry Pi Back Panel.

Q: Is this card stackable?
A: Yes. It can be stacked with up to seven other HOP cards per Back Panel. Additional Back Panels can be chained for larger systems.

Q: Can I use this card without a Raspberry Pi?
A: Yes, via RS485 and MODBUS RTU, the 8-Channel 4–20 mA Output Card can be controlled by an external PLC or industrial controller without a Raspberry Pi.

Q: What types of loads can the outputs drive?
A: The card is designed to drive standard industrial 4–20mA current loops in both sourcing and sinking configurations. Refer to the datasheet for load specifications.

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