Technical Specifications Parameter Value Product Range Modicon M221 Product Type Logic Controller Discrete I/O Total 40 Discrete Inputs 24 total (including 4 fast inputs, conforming to IEC 61131-2 Type 1) Discrete Outputs 16 transistor (sink/NPN logic, including 4 fast outputs) Analog Inputs 2 (0...10 V DC, 10-bit resolution) Rated Supply Voltage ([Us]) 24 V DC Supply Voltage Limits 20.4...28.8 V DC Program/Data Memory 256 kB RAM (for user application and data) Backup Memory 256 kB built-in flash memory Data Storage 2 GB SD card (optional) Execution Time 0.2 µs / Boolean, 0.3 ms / 1 Kinstruction Discrete Output Current 0.5 A per output Counting Inputs 4 fast inputs (HSC mode) at 100 kHz, 32 bits Positioning Functions PTO: 4 axes pulse/direction (100 kHz), 2 axes CW/CCW (100 kHz) Real-Time Clock Yes Integrated Communication Ports 1 x USB Mini B (programming) 1 x Non-isolated serial link (RJ45) RS485 1 x Non-isolated serial link (RJ45) RS232/RS485 Communication Protocols Modbus master/slave RTU/ASCII, SoMachine-Network I/O Expansion Up to 7 modules (local architecture) / Up to 14 modules (remote architecture) Mounting 35 mm DIN rail or panel Dimensions (W x H x D) 160 mm x 90 mm x 70 mm Net Weight 0.63 kg Protection Rating IP20 Operating Temperature -10...55 °C (horizontal installation) / -10...35 °C (vertical installation) Certifications CE, UL, CSA, RCM, EAC, LR, ABS, DNV-GL, cULus HazLoc Standards IEC 61131-2, UL 508, CSA C22.2 No. 213, IACS E10, ANSI/ISA 12-12-01