This IO module adds electrically isolated analogue inputs and relay outputs to StamPLC systems where high and low voltage circuits coexist. The M5Stack StamPLC IO is an electrically isolated IO expansion module designed for the StamPLC host and developed for industrial environments where high- and low-voltage circuits coexist. It provides two active analogue acquisition channels, two solid-state relay outputs, and one mechanical relay output. The module supports signal acquisition from industrial active voltage and current sensors while controlling the on/off state of various load circuits. Its onboard STM32G030F6P6 main controller centrally manages external inputs and outputs, relay driving, address assignment, and I2C bus communication over the isolated channel. A hardware DIP switch allows the I2C address to be customized, enabling multiple modules to be connected in parallel or cascaded for flexible IO expansion. The module integrates a CA-IS3020S digital isolator and B0505M-2WR3 isolated power module to provide complete electrical isolation between the communication bus and power circuit. This design effectively suppresses common-mode interference and surge impacts from sensors and field loads, significantly improving overall system stability. It is suitable for industrial automation applications such as power branch monitoring, low-voltage actuator driving, and sensor power management. StamPLC not included Features * STM32G030F6P6 main controller * I2C communication interface * Onboard 4-position DIP switch for configuring the device I2C address * Analog Signal Acquisition * 2 active analogue signal detection channels * Supports DC 0 ~ 10V voltage-output sensors * Supports 0 ~ 20mA current-output sensors * Solid-State Relay Outputs * 2 solid-state relay control channels * Supports switching DC 0 ~ 60V MAX 2.5A circuits * Mechanical Relay Output * 1 mechanical relay control channel * Supports switching AC 250V@5A / DC 28V@5A circuits * Isolated I2C Communication * Built-in CA-IS3020S I2C isolator * Built-in B0505M-2WR3 isolated power module * Onboard relay output status indicator LEDs * Industrial Protection and DIN Rail Installation * Protection circuits on input and output channels * DIN rail mounting / mounting-hole installation Specifications MCU STM32G030F6P6 Communication I2C @ 0x20 I2C Isolator CA-IS3020S Isolated Power Module B0505M-2WR3 Power Conversion TPAP7343D-33FS4 Voltage / Current Monitor INA226AIDGSR Detection Channels 2 analogue signal detection channels (compatible with 0 ~ 20mA and 0 ~ 10V analogue acquisition) MOS Switch Output 2 solid-state relay outputs, MOS1 / MOS2, common terminal COM, supporting DC 0 ~ 60V MAX 2.5A switching Relay Output 1 SRD-5VDC-SL-C mechanical relay, N.C / COM / N.O terminals, supporting AC 250V@5A / DC 28V@5A switching Address Configuration 4-position DIP switch, configurable I2C address range: 0x20 ~ 0x2F Control Interface Type 2 x 3P switch output / relay terminals, 1 x 6P input terminal Installation DIN rail mounting / mounting hole Product Size 51.4 x 80.0 x 27.1mm Product Weight 62.1g Resources * Product documents Package Contents * 1x IO Module for StamPLC * 2x Mounting brackets StamPLC not included