✅ General Information

• Full Name: AX521: S500, Analog I/O Module, 4AI/4AO, U/I/RTD, 12bit+sign, 24VDC, 2/3‑wire

• Mounting: 35mm DIN rail

• Termination: Screw / spring terminals (TU515/TU516)

• Protection: IP20

• Dimensions (W×H×D): 67.5 × 76 × 62 mm

• Net Weight: ~0.13 kg

• Key Features: Universal analog ranges, RTD (PT100/PT1000), 12bit+sign resolution, 2/3‑wire connection, per‑channel LED status

✅ Function & Application

• Core Function:

  • 4 analog inputs (AI): Voltage, current, or RTD (PT100/PT1000)

  • 4 analog outputs (AO): Voltage or current

• Product Profile: Compact universal analog I/O, designed for small‑to‑medium process control (temperature, pressure, flow, level).

• System Role: AC500 local/remote I/O expansion, integrated analog measurement and control.

✅ Technical Specifications

• Channel Configuration: 4AI (U/I/RTD) + 4AO (U/I)

• Input Ranges (AI):

  • Voltage: ±10V, 0…+10V

  • Current: 0…20mA, 4…20mA

  • RTD: PT100, PT1000

• Output Ranges (AO):

  • Voltage: ±10V, 0…+10V

  • Current: 0…20mA, 4…20mA

• Resolution: 12 bit + sign (13 bits total)

• Accuracy: ±0.1% of full scale (typical)

• Isolation: Channel‑to‑channel 1500VAC 1min, group isolation AI/AO

• Status Indication: Per‑channel LED (ON/OFF)

• Power Supply: 24VDC ±10%, 2.5W typical

• Operating Temperature: 0…+60°C (horizontal); 0…+40°C (vertical)

✅ Compatible Accessories

• Terminal Units: TU515 (spring) / TU516 (screw)

• Expansion Cables: TK501 / TK502 (module cascading)

• Rail: Standard 35mm DIN rail

• PLC Compatibility: ABB AC500 / AC500‑eCo

• Bus Modules: CI511/CI512 (EtherCAT), CI501/CI502 (Profinet)

✅ Typical Applications

• Process Industry: Water treatment, pumping stations, HVAC (temperature/pressure/flow monitoring + valve control)

• General Machinery: Plastics, textiles, packaging (analog sensor + actuator control)

• Building Automation: HVAC, energy management (temperature/humidity monitoring + damper/valve control)