Digital I/O module PFAP401-QZ2C PICO PRO D4

Modbus RTUModbusRS-485

Description
The PFAP401-QZ2C PICO PRO D4 is an intelligent I/O and sensor module providing 2 opto‑isolated digital inputs, 2 opto‑isolated transistor digital outputs with separate commons (4 common), and an SIO Bus for expandable I/O and environmental sensors. Designed for pulse counting and remote status signalling, the module supports Modbus‑RTU over RS485 and features remotely upgradeable firmware. The unit is DIN‑rail mountable and occupies 4 modules. Power supply: 230–240 VAC.

Main features

• 2 opto‑isolated digital inputs with debounce filter (suitable for pulse counting and remote status monitoring)
• 2 opto‑isolated transistor digital outputs with separate commons, programmable for alarm outputs or remote control
• Digital outputs rating: 27 VDC / 27 mA (according to DIN 43864)
• SIO Bus for integration of additional digital/analog I/O and environmental sensors (expandable post‑commissioning via Milli Pro devices)
• Up to eight configurable alarms (can drive outputs and/or set Modbus status registers)
• LED indicators: power, status, RS485 communication
• Communication: Modbus‑RTU over RS485
• Firmware remotely upgradeable
• DIN‑rail mounting, 4‑module width

Applications / Use cases

• Pulse counting and remote status monitoring
• I/O expansion and environmental sensing via SIO Bus
• Alarm signalling and remote control through Modbus‑RTU

Technical specifications

• Model: PFAP401-QZ2C
• Product name: PICO PRO D4
• Type: Intelligent I/O and sensor module
• Digital inputs: 2, opto‑isolated, with debounce filter
• Digital outputs: 2, opto‑isolated transistor, separate commons (4 common)
• Digital outputs rating: 27 VDC / 27 mA (DIN 43864)
• SIO Bus: supported, allows additional digital/analog I/O and sensors (Milli Pro compatible)
• Alarms: up to 8 configurable alarms (drive outputs and/or Modbus registers)
• Communication: RS485, Modbus‑RTU
• Firmware: remotely upgradeable
• Mounting: DIN‑rail
• Module size: 4‑module
• Power supply: 230–240 VAC
• LED indicators: power, status, RS485 communication