The NORVI X-R8 is an 8-channel relay output expansion module designed for the NORVI X modular controller platform. It provides electrically isolated relay outputs suitable for industrial control, automation, and power switching applications. Relay outputs are controlled via an I²C I/O expander (PCA9538), allowing reliable expansion with minimal MCU I/O usage.
Product Features #
- 8 × Electromechanical relay outputs (COM / NO)
- Controlled via PCA9538 I²C I/O expander
- Industrial relay with high endurance
- Suitable for AC and DC load switching
- Compact DIN-rail compatible expansion module
- Designed for NORVI X modular architecture
Applications #
- Machine and process signal monitoring
- PLC and control system I/O expansion
- Sensor interfacing in industrial automation
- Low-frequency pulse and state detection
Product Block Diagram #
Main #
| Range of Product | NORVI X |
| Product type | Expansion Module for NORVI X Series |
| Certifications | EN 61131-2:2007 EN 61010-1:2010+A1:2019 EN IEC 61010-2-201:2018 2014/30/EU- Electromagnetic Compatibility (EMC) Annex III, Part B, Module C |
| Rated supply voltage | 24V DC |
Complementary #
| Product Part Numbers | NORVI X-R8 |
Mechanical Properties #
| Enclosure | NORVI X-N1 |
| Mounting / Installation Method | DIN RAIL |
| Terminal Type | Push-in terminal |
| Terminal Arrangement | Front |
| Length | 81.00 mm |
| Height | 104.00 mm |
| Width | 23.50 mm |
Environment #
| IP degree of protection | IP20 |
| Operating altitude | 0 – 2000 meters |
| Operating Temperature | –10 … +85° C (14…185 °F) |
| Storage altitude | 0 – 3000 meters |
| Shock resistance | 15 gn for 11ms |
| Resistance to electrostatic discharge | 4kV on contact 8kV on air |
| Resistance to electromagnetic fields | 10 V/m (80 MHz …… 1GHz) 3 V/m (1.4 MHz …… 2 GHz) 1 V/m (2 MHz …… 3 GHz) |
Electrical Characteristics #
Grid Powered Devices #
| Rated Supply Voltage (V) | 24V DC |
| Current Consumption (mA) | 80mA @ 24VDC |
I/O Specifications #
| Parameter | Specification |
|---|---|
| Number of Outputs | 8 SPST Relays Outputs |
| Output Type | Single Pole Normally Open Relay |
| Isolation Voltage | 750 Vrms Between open contacts |
| Insulation System | Class F |
| Standard | IEC 61810 |
| Rated Switching Voltage | 250 VAC / 30 VDC |
| Maximum Switching Voltage | 277 VAC |
| Rated Switching Current | 5 A |
| Limiting Continuous Current | 5 A |
| Breaking Capacity (Max) | 1250 VA (AC) | 750 W (DC) |
| Contact Material | AgNi, gold-plated |
| Initial Contact Resistance | ≤ 30 mΩ (5 VDC, 100 mA) |
| Mechanical Endurance | 10 × 10⁶ operations |
| Power Supply | 24 V DC (shared with CPU via expansion port) |
| Communication Bus | Direct GPIO / Internal Expansion Bus |
| Connector Type | Push-in Terminal Block |
Terminal Configuration #
| No. | Terminal | Description |
|---|---|---|
| 1 | RO1_NO | Relay 1 Normally Open |
| 2 | RO1_COM | Relay 1 Common |
| 3 | RO2_NO | Relay 2 Normally Open |
| 4 | RO2_COM | Relay 2 Common |
| 5 | RO3_NO | Relay 3 Normally Open |
| 6 | RO3_COM | Relay 3 Common |
| 7 | RO4_NO | Relay 4 Normally Open |
| 8 | RO4_COM | Relay 4 Common |
| 9 | RO5_NO | Relay 5 Normally Open |
| 10 | RO5_COM | Relay 5 Common |
| 11 | RO6_NO | Relay 6 Normally Open |
| 12 | RO6_COM | Relay 6 Common |
| 13 | RO7_NO | Relay 7 Normally Open |
| 14 | RO7_COM | Relay 7 Common |
| 15 | RO8_NO | Relay 8 Normally Open |
| 16 | RO8_COM | Relay 8 Common |
| 17 | GND | Ground |
| 18 | GND | Ground |
GPIO Utilization #
| Utilization | Connection to CPU |
|---|---|
| SCL | IO9 |
| SDA | IO8 |
I2C Address Selection #
| DIP 2 | DIP 1 | Address |
| OFF | OFF | 0x73 |
| OFF | ON | 0x72 |
| ON | OFF | 0x71 |
| ON | ON | 0x70 |
Expansion Port #
Utilized GPIO Connections are highlighted in Yellow. They cannot be used for any other purpose with this module connected.
| PIN INDEX | Purpose | GPIO | SOURCE |
|---|---|---|---|
| 1 | MOSI | IO35 | ESP32-S3 |
| 2 | MISO | IO37 | ESP32-S3 |
| 3 | SCLK | IO36 | ESP32-S3 |
| 4 | SCL | IO9 | ESP32-S3 |
| 5 | SDA | IO8 | ESP32-S3 |
| 6 | RX1 | IO18 | ESP32-S3 |
| 7 | TX1 | IO17 | ESP32-S3 |
| 8 | P1_2 | ESP32-S3 | |
| 9 | P1_1 | ESP32-S3 | |
| 10 | GND | — | ESP32-S3 |
| 11 | GND | — | ESP32-S3 |
| 12 | CS1 | P1_0 | PCA9539 I2C Address 0x75 |
| 13 | CS2 | P0_7 | PCA9539 I2C Address 0x75 |
| 14 | CS3 | P0_6 | PCA9539 I2C Address 0x75 |
| 15 | CS4 | P0_5 | PCA9539 I2C Address 0x75 |
| 16 | IO1 | IO1 | ESP32-S3 |
| 17 | IO2 | IO2 | ESP32-S3 |
| 18 | IO4 | IO4 | ESP32-S3 |
| 19 | IO5 | IO5 | ESP32-S3 |
| 20 | IO6 | IO6 | ESP32-S3 |
| 21 | IO7 | IO7 | ESP32-S3 |
| 22 | IO10 | IO10 | ESP32-S3 |
| 23 | IO11 | IO11 | ESP32-S3 |
| 24 | IO12 | IO12 | ESP32-S3 |
| 25 | IO13 | IO13 | ESP32-S3 |
| 26 | IO14 | IO14 | ESP32-S3 |
| 27 | IO15 | IO15 | ESP32-S3 |
| 28 | IO16 | IO16 | ESP32-S3 |
| 29 | P1_1 | P1_1 | PCA9539 I2C Address 0x75 |
| 30 | P1_2 | P1_2 | PCA9539 I2C Address 0x75 |
| 31 | IO21 | IO21 | ESP32-S3 |
| 32 | P1_3 | P1_3 | PCA9539 I2C Address 0x75 |
| 33 | P1_4 | P1_4 | PCA9539 I2C Address 0x75 |
| 34 | P1_5 | P1_5 | PCA9539 I2C Address 0x75 |
| 35 | IO39 | IO39 | ESP32-S3 |
| 36 | IO40 | IO40 | ESP32-S3 |
| 37 | 5V | 5V | |
| 38 | GND | GND | |
| 39 | GND | GND | |
| 40 | 24V | 24V |
