Industrial I/O for your Rasperry Pi - Rack & I/O Selection Guide
Sense and switch industrial-level loads with your Pi.
Along with your Raspberry Pi and and the digital I/O Carrier Board, you'll need to select the input and output modules specific to your application.
This guide will help you select the ideal rack system (G4 or SNAP), rack size, and I/O modules.
Here's what you'll need to complete your system:
Digital I/O Carrier Board for Raspberry Pi (OPTO-P1-40P)
The OPTO-P1-40P carrier board provides a GPIO interface between your Raspberry Pi and Opto 22 digital I/O modules on select mounting racks. Interface cable and Pi board mounting standoffs included.
Just plug the carrier board's interface cable into your Pi's 40-pin GPIO connector, and snap the board onto a compatible Opto 22 I/O mounting rack.
SPECIAL STARTER KIT OFFERGet a complete starter kit with everything you need to get started with digital I/O for your Raspberry Pi. All you need is your Raspberry Pi and a 5V 2A power supply.
Click for more details, including what parts come with the starter kit. |
I/O Mounting Racks—Choose one based on density and number of I/O points you need.
Choose G4 or SNAP I/O:
G4 I/O has 1 point per module. Each output module is individually fused and can switch up to 3 A.
SNAP I/O takes up less space with 4 points per module and costs less per point. (The image below shows a SNAP system with 16 points.) Most output modules can switch up to 0.75 A per point or a total of 3 A per module. SNAP-OMR6 modules can switch up to 6 A.
- SNAP-D4M - Holds 4 SNAP I/O modules (16 points)
Note for customers who prefer to use Quad Pak or G1 I/O digital modules: the carrier board also supports the following racks: PB16HQ, PB4H, PB8H, and PB16H.
I/O Modules—Choose I/O based on the sensors and actuators you will connect to.
G4 I/O modules (use with G4PB8H or G4PB16H racks)
SNAP I/O modules (use with SNAP-D4M rack)
For more details on compatible modules & racks, see Digital I/O for Raspberry Pi Selection Guide.
G4 Inputs (1 point each)
| Sensor signal required | Input module part # |
| 90–140 VAC/VDC | G4IAC5 |
| 180–280 VAC/VDC | G4IAC5A |
| 90–140 VAC/VDC, low input impedance | G4IAC5L |
| 90–140 VAC/VDC, with manual/auto switch | G4IAC5MA |
| 10–32 VDC | G4IDC5 |
| 2.5–28 VDC | G4IDC5D |
| 35–60 VDC | G4IDC5G |
| 10–32 VDC, with manual/auto switch | G4IDC5MA |
| Digital Input Switch (to simulate an input) | G4SWIN |
G4 Outputs (1 point each)
| Actuator signal required | Output module part # |
| 12–140 VAC | G4OAC5 |
| 24–280 VAC, normally open | G4OAC5A |
| 24–280 VAC, normally closed | G4OAC5A5 |
| 12–140 VAC, with manual/auto switch | G4OAC5MA |
| 24–280 VAC, with manual/auto switch | G4OAC5AMA |
| 5–60 VDC | G4ODC5 |
| 5–200 VDC | G4ODC5A |
| 5–60 VDC, with manual/auto switch | G4ODC5MA |
| Digital Output Switch, 250 VAC/VDC (to simulate an output) | G4SWOUT |
SNAP Inputs (4 points each)
| Sensor signal required | Input module part # |
| 90-140 VAC/VDC | SNAP-IAC5 |
| 180-280 VAC/VDC | SNAP-IAC5A |
| 90-140 VAC/VDC, isolated, with manual/auto switch | SNAP-IAC5MA |
| 10-32 VAC/VDC | SNAP-IDC5 |
| 2.5-28 VDC, low-voltage input | SNAP-IDC5D |
| 35-75 VAC/VDC | SNAP-IDC5G |
| 15-32 VDC, leakage-tolerant | SNAP-IDC5-HT |
| 10-32 VDC/VAC, isolated, with manual/auto switch | SNAP-IDC5MA |
| Contact status, normally open | SNAP-IDC5-SW |
| Contact status, normally closed | SNAP-IDC5-SW-NC |
SNAP Outputs (4 points each)
| Actuator signal required | Output module part # |
| 12-250 VAC | SNAP-OAC5 |
| 12-250 VAC, isolated channels | SNAP-OAC5-I |
| 12-250 VAC, isolated, with manual/auto switch | SNAP-OAC5MA |
| 5-60 VDC, load sourcing | SNAP-ODC5SRC |
| 5-60 VDC, load sinking | SNAP-ODC5SNK |
| 5-200 VDC, load sinking | SNAP-ODC5ASNK |
| 5-60 VDC, isolated, with manual/auto switch | SNAP-ODC5MA |
| 5-60 VDC, isolated channels | SNAP-ODC5-I |
| 5-200 VDC, isolated channels | SNAP-ODC5A-I |
| Mechanical Power Relay, Form C | SNAP-OMR6-C |
| Mechanical Power Relay, Form C, with integrated transient suppression | SNAP-OMR6T-C |
Power Supply
Typical Raspberry Pi rated mini-USB power supplies will work for powering the Pi and the I/O. We also offer an industrial power supply:
| Input voltage | Output current | Part number | Comments |
| 12/24 VDC | 1.5 A | PBSC | Screws to threaded contacts on the mounting rack; fits conveniently underneath the Carrier Board |
USB peripherals: If you are using USB-powered peripherals attached to the Pi (like hard drives, displays, or WiFi dongles), you require a larger power supply that puts out more current. We recommend a 5 V power supply rated 2.5 A to 5 A, connected to the rack power terminals.
If you’re using peripherals, you’ll also need to replace the mounting rack’s 1 A fuse with a 5 A fuse (included with the Digital I/O Carrier Board).
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