Product Description

Model Number Interpretation

• 45C: Prefix for Reliance AutoMate 45C series PLC modules.

• 202: Designates R‑NET network processor (vs. 200 = local I/O processor, 204 = failsafe processor).

• A: First hardware revision (enhanced stability, better EMC performance, minor component upgrades).

• Alternate P/N: 45C-202-A, 802820‑118RB (same as 45C202).

Technical Specifications

• Power Supply: 24VDC via system backplane.

• Network: R‑NET peer‑to‑peer coaxial network (BNC connector).

• Status LEDs: 8 indicators: READY, XMIT, RECV, COM OK, 4×COM ER.

• Node Address: Set via two alphanumeric dials (HI/LO: A, C, E, 0, 2, 4, 6, 8).

• Operating Temperature: 0°C to 55°C.

• Mounting: DIN rail or panel mount; rugged metal enclosure.

• Weight: Approx. 1.0 kg.

• Key Upgrade (vs. 45C202): Improved transient voltage suppression, more robust communication IC, and tighter manufacturing tolerances for higher reliability in harsh environments.

Interface & Communication

• Backplane: Connects to AutoMate 30/40/45C series CPU via proprietary backplane bus.

• R‑NET Port: BNC connector for coaxial cable; supports multi‑drop network topology (up to 32 nodes).

• No Local I/O Ports: Designed exclusively for network communication, not direct I/O control.

• Programming: Configured via the main CPU; no independent programming port.

Core Functions

• Manages R‑NET network communication for up to 32 nodes (PLCs, I/O stations, gateways).

• Handles data framing, error checking, and retransmission for reliable communication.

• Provides real‑time status monitoring via front‑panel LEDs (READY = operational, COM OK = no errors).

• Enables distributed I/O expansion across multiple stations.

• Offloads communication tasks from the main CPU to improve system performance.

• Revision A Enhancements: Reduces network latency, improves fault tolerance, and lowers failure rates in high‑noise industrial environments.

Application Scenarios

• R‑NET Network Master/Slave in AutoMate 30/40/45C PLC systems.

• Distributed control systems for manufacturing, process control, and material handling.

• Legacy system upgrades replacing older 45C202 units in aging production lines.

• High‑reliability environments requiring robust industrial communication (e.g., automotive, packaging, food & beverage).

Usage & Maintenance

• Install securely in a single backplane slot; ensure BNC cable is properly terminated (50Ω).

• Set node address via HI/LO dials before powering on (avoid duplicate addresses).

• Inspect LEDs regularly: READY (on = operational), COM OK (on = no communication errors).

• Keep enclosure clean and free of dust to prevent overheating; ensure adequate ventilation.

• Use only with AutoMate 30/40/45C series backplanes and CPUs; not compatible with AutoMate 20 series.

• For Revision A: No special configuration changes vs. 45C202; plug‑and‑play compatible (drop‑in replacement).