OMRON Sysmac C20-CPU74E 3G2C7-CPU74E relay module

I. Basic Information
Model: C20-CPU74E (= 3G2C7-CPU74E)
Brand: OMRON
Series: Sysmac C20 (Classic Small PLC)
Type: CPU integrated host (with built-in I/O)
Status: Out of Production (EOL), market is mainly refurbished / second-hand
II. Hardware Specifications (Core Parameters)
1) Power Supply
Voltage: 24VDC ±10%/‑15%
Power Consumption: Approximately 20W
Input Type: DC NPN (sink), 7mA / point

2) I/O Points
Input: 16 points (DC24V, NPN, 8 points / COM)
Output: 12 points (relay contacts, 8/3/1 common terminal)
Output Capacity: 250VAC / 24VDC, 2A / point (maximum)
Relay Life: Electrical 300,000 times / Mechanical 500,000 times
3) Performance and Storage
Processing Speed: 10μs / address (approximately 6 bytes / instruction)
Program Memory: RAM 512 bytes / EPROM 1194 bytes
Instruction Set: 27 basic instructions, ladder diagram programming
Size / Weight: Approximately 250×150×50mm / 1.35kg
4) Environment
Operating Temperature: 0°C ~ +55°C
Installation: DIN rail or panel installation
III. Model Relationship (C20-CPU74E vs 3G2C7-CPU74E)
Identical Product: 3G2C7-CPU74E is the internal old material number of OMRON; C20-CPU74E is the external market model, and the two can be directly interchanged.
Common Label: C20-CPU74E (3G2C7-CPU74E)
IV. Typical Applications
Standard for equipment such as injection molding machines, packaging machines, assembly lines, and small machine tools in the early years
Replacement for older models (such as C20-CPU72E), used for spare parts for old equipment
Simple logic control, sequential control, linkage and interlock scenarios