ZPi-IO8R Specifications

ZPi-IO8R uses a Raspberry Pi Zero 2 W as its core processor and an RP2040 as its auxiliary I/O processor. The board has four digital inputs, four relay outputs, an RS-485 port and an OLED status display.

ZPi-IO8R with Raspberry Pi Zero 2 W, OLED, relays and I/O terminals

Power and processors

Item	Specification
Model	ZPi-IO8R
Nominal power input	DC 24 V
Power input range	DC 12 to 24 V
Core processor	Raspberry Pi Zero 2 W, quad-core Cortex-A53, 64-bit
Auxiliary I/O processor	RP2040, dual-core Cortex-M0+

The board has separate core and I/O processors. Raspberry Pi Zero 2 W is the core processor; RP2040 handles the auxiliary I/O role.

Digital inputs and relay outputs

Item	Specification
Digital inputs	4 channels
Input signal voltage	DC 9 to 24 V
Input current	10 mA maximum
Input isolation	Photocoupler
Digital outputs	4 relay contacts
AC output load rating	0 to 250 V, 5 A
DC output load rating	0 to 30 V, 5 A
Output response time	10 ms
Output status indicator	Red LED

The power input accepts DC 12 to 24 V, while the digital inputs accept DC 9 to 24 V. Check the relay voltage rating for the load type: the AC and DC limits differ.

Network and serial interfaces

Item	Specification
Wireless network	Built-in Wi-Fi
Wired network	Optional WIZnet W5500 Ethernet
Serial interface	RS-485
Serial protocol	Modbus RTU

Wi-Fi is built in; W5500 Ethernet is optional. The product photo shows an RJ45 connector, but Ethernet is not included in every configuration.

OLED and status indicators

Item	Specification
Display	128 × 64 OLED
Controller	SSD1306
Interface	I²C
Standard display items	IP, time, I/O
User slots	3
Status LEDs	Power, communication, I/O

The OLED shows IP, time and I/O status and has three user slots. The board also has LEDs for power, communication and I/O status.

Dimensions and installation conditions

Item	Specification
Dimensions	77 × 85.2 × 34.8 mm
Mounting	Compatible with standard 35 mm DIN rail
Terminals	Removable screw terminals
Operating temperature	-10 to 50°C
Ambient humidity	10 to 95% RH, noncondensing

The board mounts on 35 mm DIN rail and uses removable terminal blocks. The table lists its operating temperature and humidity limits.

Using the board with Senbrix

The Senbrix development environment includes a ZPi-IO8R carrier board definition. You can select it from the board list and map it to the project’s IN/OUT slots.

Sources

This article uses the supplied ZPi-IO8R product photo and specification tables for the system, I/O, dimensions and operating conditions. The existing Senbrix development environment documentation is the source for board support.