Key Parameters 1. Power Supply: Supply Voltage: 24V DC (Nominal range: 19.2 - 28.8V DC). Power Consumption: Typically < 10 W. 2. Core I/O (Integrated on Base Unit): Digital Inputs (I): 24 digital inputs. All are configurable, with several capable of high-speed counting (up to 10 kHz). Digital Outputs (Q): 16 relay outputs (as denoted by -R). Contact Rating: 5 A at 250V AC / 2 A at 30V DC (resistive load per contact). Refer to manual for specific load derating (inductive, lamp, motor). Isolation: Relay groups are isolated. 3. Programming & Intelligence: Processing Power: Significantly more memory and processing capability than EASY500/700 series, supporting larger and more complex programs. Programming Software: EASY-SOFT Pro or EASY-SOFT 7 (more advanced than the standard EASY-SOFT). Programming Languages: Primarily Function Block Diagram (FBD) with enhanced function blocks. Also supports Ladder Diagram (LD) for easier interpretation by electricians. Display: Large, backlit graphical display (128 x 64 pixels) for clear visualization of system status, bar graphs, mimic diagrams, and text messages. Data Logging: Capable of storing data records (e.g., fault logs, production counts) in non-volatile memory. 4. Communication (The First "C" in -RCX): This is a key differentiator. The EASY820 features a built-in communication interface. Integrated Port: RS-485 interface. Supported Protocols: Modbus RTU (Slave/Master): For integration into SCADA, HMIs, or building management systems (BMS). EASY-LINK: For peer-to-peer networking of up to 30 EASY800 devices. Function: Enables remote monitoring, control, parameter setting, and data exchange. 5. Expansion Capability (The "X" in -RCX): The unit features a dedicated expansion bus connector. Expansion Modules: Can connect a wide range of EASY800 System Expansion Modules directly to the right side of the unit. Supported Modules: Additional Digital I/O modules. Analog I/O Modules (e.g., 4 AI, 2 AO) for reading sensors (0-10V, 0/4-20mA) and controlling analog devices. Specialty Modules: Temperature (PT100, thermocouple) inputs, counter modules, etc. Max Expansion: Can control a substantial local I/O system, far beyond the base unit's capacity. 6. Real-Time Clock & Special Functions: Integrated Real-Time Clock: Battery-backed real-time clock for time- and date-stamping, scheduling, and shift management. Advanced Function Blocks: Includes PID controllers for closed-loop control, complex math functions, shift registers, and drum sequencers. 7. Mechanical & Environmental: Mounting: 35 mm DIN rail. Dimensions (W x H x D): Approx. 144 mm x 125 mm x 68 mm (larger than EASY500/700 series). Protection Class: IP20 (for enclosure mounting). Operating Temperature: -25°C to +55°C. 8. Certifications & Approvals: cULus Listed (UL 508), CE, DNV-GL, RoHS, REACH. 9. Typical Applications: Medium-complexity machine control (packaging, material handling, assembly). Building automation (HVAC control, lighting management, energy monitoring). Process control with analog loops (temperature, pressure, flow). Small production line control with networked devices. Wastewater treatment system control.